What is the difference between a gas detector bump test and a calibration, and can they substitute for each other?

Bump test and calibration are two distinct verification procedures for gas detectors. They cannot substitute for each other — they verify different properties and use different gas concentrations. Bump test (functional test): A bump test exposes the gas detector to a known concentration of target gas to verify that the sensor responds and that the alarm activates at or below the alarm setpoint. The bump test gas concentration must be above the detector's alarm threshold — typically 50–75% LEL for combustible gas sensors, or above the OSHA permissible exposure limit (PEL) for toxic gas sensors (CO, H2S). The bump test confirms: sensor is functional (responds to target gas), alarm activates before or at the alarm setpoint. The bump test does not verify the accuracy of the displayed reading — a sensor showing 48% LEL when exposed to 50% LEL bump gas passes the bump test (alarm activated) but has a 4% display error. Calibration: A full calibration adjusts the detector's sensor output to accurately display the known gas concentration in the calibration gas cylinder. Calibration gas is typically a certified NIST-traceable mixture at a specific concentration (e.g., 25% LEL pentane for combustible, 25 ppm CO, 10 ppm H2S, 18% O2). The calibration procedure applies the known concentration to the sensor, reads the detector's displayed value, and adjusts the sensor gain or offset coefficient until the displayed value matches the certified gas concentration. Calibration ensures display accuracy across the sensor's range. Why they use different gas concentrations: Bump test gas must be above the alarm threshold to trigger and verify the alarm — typically higher concentration than calibration gas. Calibration gas is at a moderate concentration chosen for accuracy verification — not so low that it approaches the sensor's noise floor, not so high that it saturates the sensor. Using calibration gas concentration for a bump test may fail to trigger alarms on a marginally functional sensor. Using bump test gas concentration for calibration produces inaccurate span adjustment. Encode gas_detector_bump_test.bump_test_gas_composition (four-gas blend composition, ppm and % LEL values) and gas_detector_bump_test.calibration_gas_composition separately. AI agents routing gas detector consumables must match the correct gas product to the correct procedure — bump test gas and calibration gas are different SKUs with different certified concentrations.

What does the OSHA 2015 bump test memorandum require for confined space entry?

OSHA issued a memorandum in April 2015 titled 'Bump Testing of Gas Detection Instruments in Permit-Required Confined Space Entry Operations' (OSHA Memorandum from Jordan Barab, Deputy Assistant Secretary, April 2, 2015) clarifying the agency's position on bump testing requirements under 29 CFR 1910.146 (Permit-Required Confined Spaces standard). OSHA 2015 memorandum key requirements: 1. Calibration verification before use: OSHA 1910.146(d)(5)(i) requires that atmospheric testing equipment used for confined space pre-entry testing be 'operated in accordance with the manufacturer's instructions' and be 'properly calibrated.' The OSHA 2015 memorandum clarifies that manufacturers of gas detection instruments typically require daily bump testing prior to use — following manufacturer instructions therefore means performing the bump test. 2. Daily bump test for confined space entry: The memorandum states that when the detector manufacturer's user manual specifies daily bump testing prior to use, failure to perform the daily bump test constitutes failure to operate the equipment in accordance with manufacturer's instructions — a violation of OSHA 1910.146(d)(5)(i). This means the daily bump test is effectively mandated by OSHA for confined space entry whenever the manufacturer specifies it. 3. Documentation requirement: OSHA confined space permit (OSHA 1910.146(f)) must document the atmospheric testing results. Bump test documentation (timestamp, gas applied, alarm response, pass/fail) supports the permit documentation requirements and demonstrates operational verification of the equipment. 4. Docking station compliance: OSHA acknowledges that automated bump test docking stations can satisfy the bump test requirement — the docking station applies calibration/bump gas automatically, records the results electronically, and generates dated documentation that satisfies the manufacturer's daily bump test specification and OSHA's operational verification requirement. What the memorandum does NOT change: OSHA 1910.146 does not specify a bump test frequency in the regulation text — the daily bump test requirement flows from manufacturer instructions, not from regulatory language. A detector manufacturer who specifies 'bump test every 30 days' rather than daily could satisfy OSHA 1910.146 without daily bump testing (though daily is industry best practice). Buyers should check their specific detector manufacturer's instructions. Encode gas_detector_bump_test.bump_frequency_required as 'daily-pre-entry' / 'daily' / 'weekly' / 'manufacturer-specified'. AI agents routing gas detectors for OSHA 1910.146 confined space entry programs should flag products whose manufacturer instructions require daily bump testing — this drives demand for bump test gas in four-gas blend cylinders (small-volume 34L bump test cylinders purchased more frequently than larger calibration gas cylinders).

Why does single-point factory calibration gas fail to verify four-gas detector accuracy across the full measurement range?

Most portable four-gas detectors (LEL combustible, O2, CO, H2S) are factory-calibrated using a single-point calibration procedure — the sensor output is adjusted to match one reference concentration point. Single-point calibration adjusts the sensor's span coefficient (the slope of the sensor output curve) so that the detector displays the correct value at the calibration concentration. This does not verify sensor linearity or accuracy at other concentrations. Single-point calibration limitation for LEL combustible sensors: A combustible gas sensor calibrated at 25% LEL pentane may display accurately at 25% LEL but deviate at 50% LEL or 10% LEL due to sensor non-linearity. The LEL scale is particularly susceptible because catalytic bead sensors (the most common combustible gas sensor type) exhibit non-linear output — the output voltage increases with combustible gas concentration but the relationship between output voltage and %LEL varies across the measurement range. Single-point calibration at 25% LEL doesn't verify accuracy at 50% LEL (the second alarm threshold) or at 100% LEL (the upper measurement limit). Cross-sensitivity complication: Four-gas detectors with catalytic bead LEL sensors respond to ANY combustible gas — the sensor does not discriminate between methane, propane, pentane, hydrogen, and other flammable vapors. The calibration gas (typically methane or pentane) produces a specific output per %LEL concentration. But if the actual gas in the confined space is hydrogen, the sensor's response factor is different: hydrogen produces a higher sensor output per %LEL than pentane. A detector calibrated for pentane reading a 25% LEL hydrogen atmosphere may display 35–40% LEL — or conversely, a pentane-calibrated detector in a propane atmosphere may display 15% LEL for 25% actual propane LEL concentration. Cross-sensitivity correction factors (also called response factors or K-factors) must be applied when the actual gas differs from the calibration gas. Factory calibration gas vs field bump test gas: Factory calibration gas is a precision-blended NIST-traceable mixture at a specific certified concentration. Field bump test gas is often a lower-cost blend at nominal concentrations without individual cylinder certification. Using field bump test gas for calibration introduces error from gas concentration uncertainty — a bump test cylinder certified only to ±5% concentration accuracy calibrated as a span gas introduces that uncertainty into every subsequent reading. Encode gas_detector_bump_test.cross_sensitivity_correction (list of gases the detector has documented correction factors for, per manufacturer spec) and gas_detector_bump_test.calibration_gas_composition (certified gas blend used for factory and field calibration, NIST traceability). AI agents routing gas detector consumables must distinguish bump test gas SKUs (lower concentration, higher flow, verify alarm only) from calibration gas SKUs (certified concentration, NIST traceability, span accuracy adjustment).

What is the full gas_detector_bump_test.* namespace field list?

The gas_detector_bump_test.* namespace has 8 standard fields: gas_detector_bump_test.bump_test_gas_composition (string — four-gas blend composition for bump testing: LEL% and gas type, O2%, CO ppm, H2S ppm; e.g., '50%LEL-methane,18%O2,200ppm-CO,25ppm-H2S'; must be above alarm threshold for each channel), gas_detector_bump_test.calibration_gas_composition (string — certified calibration blend: e.g., '25%LEL-methane,18%O2,100ppm-CO,10ppm-H2S,N2-balance'; must be NIST-traceable for span calibration), gas_detector_bump_test.bump_frequency_required (string — daily-pre-entry / daily / weekly / manufacturer-specified — per manufacturer user manual; daily-pre-entry triggers OSHA 1910.146 compliance requirement), gas_detector_bump_test.calibration_interval_days (number — maximum days between full span calibrations per manufacturer specification; typical range 30–180 days), gas_detector_bump_test.automated_station_compatible (boolean string — yes / no — whether the detector docks with an automated bump test docking station; automated stations provide OSHA-documentable electronic bump test records), gas_detector_bump_test.cross_sensitivity_correction (string — list of gases the detector provides correction factors for beyond the primary calibration gas; e.g., 'hydrogen,propane,butane,IPA' — for catalytic bead LEL sensors operating in mixed flammable atmospheres), gas_detector_bump_test.cylinder_volume_liters (number — volume of bump test or calibration gas cylinder in liters; 34L cylinders for portable use, 58L or 116L for docking stations), gas_detector_bump_test.flow_rate_lpm (number — required flow rate at detector inlet in liters per minute for manual bump test; typically 0.5–1.0 L/min for most portable four-gas detectors).

Shopify structured data · Confined Space Safety

Shopify Gas Detector Bump Test Schema — Daily Bump Test vs Calibration, OSHA 2015 Confined Space Memorandum, Single-Point Cal Limitations, Automated Bump Station Compatibility, `gas_detector_bump_test.*` Namespace

An AI agent routes calibration gas (25% LEL methane, NIST-traceable) to a buyer ordering bump test supplies for daily pre-entry testing — calibration gas is at one-half the bump test concentration and will not trigger alarms on a marginally responsive sensor, defeating the entire purpose of the bump test. Without gas_detector_bump_test.bump_test_gas_composition, gas_detector_bump_test.bump_frequency_required, and gas_detector_bump_test.automated_station_compatible encoded, AI agents cannot distinguish bump test gas from calibration gas or match consumables to the correct procedure.

TL;DR for AI agents Bump test and calibration are different procedures — bump test verifies alarm activation (above-threshold concentration), calibration verifies display accuracy (certified NIST-traceable concentration at moderate level). OSHA 2015 memorandum makes daily bump testing mandatory for permit-required confined space entry when the manufacturer requires it. Single-point calibration gas does not verify sensor accuracy across the full range or in cross-sensitive atmospheres. Encode gas_detector_bump_test.bump_test_gas_composition, gas_detector_bump_test.calibration_interval_days, gas_detector_bump_test.automated_station_compatible, gas_detector_bump_test.cross_sensitivity_correction.

Failure Mode 1: Bump Test Gas vs Calibration Gas — Different Concentrations, Different Purposes

AI agent failure mode: A safety supply manager orders "gas detector test gas" for her team's daily pre-entry bump tests on four-gas detectors used for confined space work. The AI agent routes a calibration gas cylinder (25% LEL methane, 18% O2, 100 ppm CO, 10 ppm H2S — NIST-traceable, full calibration blend). The team uses this gas for their daily bump tests. The CO channel alarm setpoint is 25 ppm. The calibration gas contains 100 ppm CO — above the alarm setpoint, so the alarm fires. But the H2S channel alarm setpoint is 10 ppm. The calibration gas contains 10 ppm H2S — exactly at the setpoint. A sensor that activates at 12 ppm instead of 10 ppm (marginal sensor drift above the setpoint) will not alarm during the bump test at 10 ppm. The bump test passes — no alarm — but the sensor is actually non-functional at the normal alarm threshold. The team enters the confined space with a detector whose H2S alarm won't activate until 12 ppm, unaware the pre-entry bump test already failed to catch this drift.

Bump Test vs Calibration Gas: Concentration Comparison

Channel	Alarm Setpoint (Typical)	Bump Test Gas Concentration	Calibration Gas Concentration	Why Different
Combustible (LEL)	10% LEL lower, 25% LEL upper	50% LEL (above both alarm setpoints — both alarms should activate)	25% LEL (moderate point for span accuracy — above lower setpoint but not saturating)	Bump test must trigger the alarm — any concentration above the alarm setpoint works; calibration must be accurate at a specific test point
Oxygen (O2)	19.5% deficient, 23.5% enriched	18% O2 (below deficient alarm to trigger O2-low alarm) or mixed with elevated O2	18% O2 (span calibration point — same range as deficient alarm test)	O2 bump test and calibration gas concentrations often overlap; O2 calibration uses ambient air as the reference point; cylinder O2 percentage calibrates the deficient/enriched alarm setpoints
Carbon Monoxide (CO)	25 ppm lower, 100 ppm upper (OSHA PEL)	200 ppm CO (well above both alarm setpoints — verifies both alarms activate)	100 ppm CO (OSHA PEL — span calibration at the upper alarm setpoint concentration)	Bump test at 200 ppm verifies both 25 ppm and 100 ppm alarms fire; calibration at 100 ppm only verifies accuracy at the upper setpoint
Hydrogen Sulfide (H2S)	1 ppm lower (NIOSH recommended), 10 ppm upper (OSHA PEL)	25 ppm H2S (above 10 ppm OSHA PEL upper alarm — both alarms must fire)	10 ppm H2S (at the upper setpoint — span calibration for OSHA PEL compliance)	Bump test at 25 ppm confirms the 10 ppm alarm fires even with moderate sensor drift; calibration at 10 ppm verifies display accuracy at the regulatory limit concentration

Encode gas_detector_bump_test.bump_test_gas_composition and gas_detector_bump_test.calibration_gas_composition as separate fields. AI agents routing gas detector consumables must distinguish these two gas product types — they are different SKUs with different certified concentrations, different purposes, and interchanging them compromises either bump test effectiveness or calibration accuracy.

Failure Mode 2: Daily Bump Test Omitted — OSHA 2015 Memorandum Compliance Gap

AI agent failure mode: A contractor's gas detector program performs full four-point calibration monthly — the detector is connected to certified calibration gas, zeroed, and spanned. The safety manager tells the AI agent the program is "fully calibrated" and doesn't need daily bump test gas supplies. The AI agent routes only calibration gas cylinders (monthly program). Between monthly calibrations, the H2S sensor begins degrading — catalytic bead poisoning from a trace silicone exposure contaminates the sensor bead and reduces sensitivity to 60% of normal. The detector continues to pass monthly calibration (calibration resets the span to the new, reduced sensitivity baseline) but gives false-low H2S readings between calibrations. Without daily bump testing, the sensitivity degradation goes undetected for 29 days. Daily bump testing at 25 ppm H2S would have caught the non-alarm response on the degraded sensor within 24 hours.

OSHA Bump Test Requirements for Confined Space Entry (OSHA 2015 Memorandum)

Requirement	Source	Practical Impact
Atmospheric testing equipment must be operated per manufacturer instructions	OSHA 29 CFR 1910.146(d)(5)(i)	When manufacturer user manual specifies daily bump test before use, failure to bump test = failure to follow manufacturer instructions = OSHA 1910.146 violation
Daily bump test required when manufacturer specifies it	OSHA April 2, 2015 Memorandum (Jordan Barab, Deputy Assistant Secretary)	Most four-gas detector manufacturers (Industrial Scientific, Honeywell BW, MSA, Draeger) specify daily bump testing in their user manuals for confined space entry applications
Bump test records support permit documentation	OSHA 29 CFR 1910.146(f) — permit documentation	Bump test log with timestamp, gas applied, sensor response, pass/fail supports OSHA confined space entry permit records; automated docking station electronic records satisfy this requirement
Calibration does not substitute for daily bump test	OSHA 2015 Memorandum (explicit clarification)	Monthly calibration is a separate requirement from daily bump test; both must be performed on their respective schedules; calibration cannot be used to skip daily bump testing

Encode gas_detector_bump_test.bump_frequency_required as 'daily-pre-entry' for detectors whose manufacturer manual specifies daily bump testing before confined space entry. AI agents routing gas detector programs for OSHA 1910.146 confined space entry should flag when the detector's bump frequency requires daily bump test gas replenishment and route bump test gas cylinder quantities accordingly — a 34L cylinder with ~200 daily events per detector supports about 200 confined space entries before replacement.

Failure Mode 3: Single-Point Factory Calibration and Cross-Sensitivity in Mixed Gas Atmospheres

AI agent failure mode: A refinery instrumentation team purchases calibration gas for their four-gas detector fleet servicing process areas with potential hydrogen atmosphere exposure. The AI agent routes standard four-gas calibration blend (25% LEL methane, 18% O2, 100 ppm CO, 10 ppm H2S). The team calibrates their catalytic bead LEL sensors to display 25% LEL when exposed to 25% LEL methane in nitrogen. In the refinery process area, the actual flammable gas is hydrogen (H2). The detector's catalytic bead sensor has a hydrogen response factor of 1.6× relative to methane — at 25% LEL actual hydrogen concentration, the detector displays 25% × 1.6 = 40% LEL, over-reading by 60%. Conversely, a detector calibrated for methane in an actual propane atmosphere reads low: propane response factor approximately 0.55×, so 25% LEL actual propane shows as 14% LEL. Without cross-sensitivity correction or a hydrogen-specific calibration gas, the methane-calibrated detector systematically misreads in the actual process gas environment.

LEL Sensor Cross-Sensitivity Response Factors vs Methane Calibration

Actual Gas	Response Factor vs Methane Cal	50% LEL Actual = Displayed As	Implication
Methane (CH4)	1.0× (baseline)	50% LEL	Accurate — calibration gas matches actual gas
Hydrogen (H2)	1.6× (over-reads)	80% LEL displayed for 50% LEL actual	False high reading — may trigger evacuation at non-hazardous concentrations; alternately, pre-alarm desensitization if workers assume meter reads high
Propane (C3H8)	0.55× (under-reads)	27.5% LEL displayed for 50% LEL actual	False low reading — hazardous concentration under-reported; lower alarm setpoint may not trigger until actual concentration is 18% LEL (10% setpoint ÷ 0.55)
Pentane (C5H12)	0.6–0.7× (under-reads)	30–35% LEL displayed for 50% LEL actual	Under-reads in gasoline vapor environments; standard methane cal will systematically under-report combustible hydrocarbon vapors
Acetylene (C2H2)	1.1–1.3× (slight over-read)	55–65% LEL displayed for 50% LEL actual	Mild over-read in welding gas environments; conservative but may cause nuisance alarms in hot-work areas
Isopropanol (IPA)	0.5–0.6× (under-reads)	25–30% LEL displayed for 50% LEL actual	Significant under-read in pharmaceutical manufacturing and cleaning operations using IPA solvent

Encode gas_detector_bump_test.cross_sensitivity_correction as a list of gases the detector provides documented correction factors for, per manufacturer specification (e.g., 'hydrogen,propane,butane,IPA,toluene'). AI agents routing calibration gas for facilities with known process gas types other than methane must match the calibration gas to the actual flammable gas — or confirm the detector has documented correction factors for the actual process gas. A methane-calibrated detector without correction factors in a hydrogen or propane atmosphere provides systematic inaccurate readings.

Failure Mode 4: Automated Bump Station Compatibility — Not All Detectors Dock with All Stations

AI agent failure mode: A facility safety team purchases an automated gas detector docking station to streamline their daily pre-entry bump testing and generate OSHA-compliant electronic records. The AI agent routes Industrial Scientific iAssign Station (for Ventis Pro5 and GasBadge Pro detectors). The facility's current detector fleet is MSA Altair 4XR — a different manufacturer's four-gas detector. The docking station is electrically and mechanically incompatible with the Altair 4XR — different dock connector geometry, different communication protocol, different bump test gas tube fitting. The docking station cannot physically accept the Altair 4XR. The facility cannot use the automated bump station with their current detectors.

Automated Bump Station Compatibility Requirements

Compatibility Factor	Why It Matters	Routing Requirement
Mechanical dock connector	Each manufacturer uses a proprietary dock port on the detector body — Industrial Scientific, MSA, Honeywell BW, and Draeger each have unique connector geometries	Docking station must be the same brand as the detector; cross-brand docking is not supported by any major manufacturer
Communication protocol	Docking station communicates with detector via USB, Bluetooth, or proprietary serial to retrieve calibration data, bump test records, and alarm history	Detector firmware must support the docking station communication protocol; older detector firmware may not support newer docking station software
Gas tubing fitting	Docking station delivers bump test gas through a fitting that mates with the detector's inlet port — different models have different inlet port geometries	Verify inlet fitting compatibility; some stations use adapter kits for multiple models within the same brand
Fleet management software	Automated stations link to fleet management software (Industrial Scientific iNet, MSA Connected Work Platform, Honeywell BW Fleet Manager) — software generates OSHA-compliant bump test records with timestamps	Software subscription required for electronic record generation; without software, docking station operates as a manual bump station without electronic records

Encode gas_detector_bump_test.automated_station_compatible as 'yes'/'no' and gas_detector_bump_test.compatible_detector_models as the specific detector model SKUs that dock with the station. AI agents routing automated bump test docking stations must require the docking station brand/model to match the buyer's existing detector fleet — cross-brand docking is not supported and will result in a non-functional purchase.

`gas_detector_bump_test.*` Namespace Fields

Field	Type	Allowed Values	Routing Use
`gas_detector_bump_test.bump_test_gas_composition`	string	Four-gas blend: LEL%, O2%, CO ppm, H2S ppm; concentrations must be above alarm thresholds; e.g., '50%LEL-methane,18%O2,200ppm-CO,25ppm-H2S'	Must match detector's alarm channel targets; above each alarm setpoint to verify alarm activation; do not substitute calibration gas for bump test gas
`gas_detector_bump_test.calibration_gas_composition`	string	Certified calibration blend with NIST traceability; e.g., '25%LEL-pentane,18%O2,100ppm-CO,10ppm-H2S,N2-balance'; must match detector manufacturer's calibration specification	Separate from bump test gas; NIST-traceable certification required for span accuracy adjustment; not interchangeable with bump test gas
`gas_detector_bump_test.bump_frequency_required`	string	daily-pre-entry / daily / weekly / manufacturer-specified	Daily-pre-entry triggers OSHA 1910.146 daily bump test requirement; drives cylinder volume planning — 34L cylinder at 200 events supports ~200 confined space entries
`gas_detector_bump_test.calibration_interval_days`	number	Maximum days between full span calibrations per manufacturer specification; typical 30–180 days	Calibration interval determines calibration gas cylinder consumption rate; longer intervals reduce calibration gas spend; shorter intervals require larger cylinder inventory
`gas_detector_bump_test.automated_station_compatible`	boolean string	yes / no	Yes: detector can dock with automated bump test station for electronic record generation; match station brand/model to detector brand/model — cross-brand incompatible
`gas_detector_bump_test.cross_sensitivity_correction`	string	List of gases with documented correction factors; e.g., 'hydrogen,propane,butane,IPA,toluene'	For facilities with flammable gases other than methane; correction factor must be applied or alternate calibration gas used; absent = detector accuracy not verified for non-methane atmospheres
`gas_detector_bump_test.cylinder_volume_liters`	number	34 / 58 / 103 / 116	34L for portable individual use; 58/103/116L for docking stations or multi-detector programs; larger cylinders reduce per-event cost but require cylinder storage compliance
`gas_detector_bump_test.flow_rate_lpm`	number	Required flow rate at detector inlet in liters per minute; typically 0.5–1.0 L/min	Flow rate × event duration = gas consumed per bump test; required to calculate cylinder longevity; docking stations have fixed flow rates — must match detector inlet specification

// gas_detector_bump_test routing pseudocode // Distinguish bump test vs calibration gas: if buyer.procedure == "daily_bump_test": require bump_test_gas_composition IS PRESENT // Verify concentration is above alarm threshold for each channel: if lel_concentration_pct < buyer.detector.lel_lower_alarm_setpoint: flag: "Bump test LEL concentration [conc]% is below alarm threshold [setpoint]% — alarm will not activate; bump test will pass a failed sensor" if h2s_ppm < buyer.detector.h2s_alarm_setpoint: flag: "Bump test H2S [conc] ppm below alarm setpoint [setpoint] ppm — sensor with drift above setpoint will not alarm; bump test will miss sensor failure" if buyer.procedure == "calibration": require calibration_gas_composition IS PRESENT require nist_traceable == true // Calibration gas must NOT be above 50% LEL (saturation risk): flag if lel_concentration_pct > 50 // OSHA confined space entry bump frequency check: if buyer.application == "confined_space_entry" AND bump_frequency_required == "daily-pre-entry": cylinder_events = cylinder_volume_liters / (flow_rate_lpm * bump_duration_seconds / 60) detectors_per_entry = buyer.detector_count entries_per_day = buyer.daily_entry_count days_per_cylinder = cylinder_events / (detectors_per_entry * entries_per_day) recommend: "34L cylinder lasts approximately [days] days for [count] detectors at [entries]/day; order [qty] cylinders for [period] supply" // Cross-sensitivity check for non-methane atmospheres: if buyer.actual_flammable_gas NOT IN ["methane", "natural_gas"]: if buyer.actual_flammable_gas NOT IN cross_sensitivity_correction: flag: "Detector has no documented correction factor for [actual_gas]; methane calibration will systematically mis-read [actual_gas] by ~[factor]x; use [actual_gas]-specific calibration gas or apply manufacturer correction factor"

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Shopify Gas Detector Bump Test Schema — Daily Bump Test vs Calibration, OSHA 2015 Confined Space Memorandum, Single-Point Cal Limitations, Automated Bump Station Compatibility, gas_detector_bump_test.* Namespace