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Guide · Gas detection · Honeywell BW MicroClip how-to

How to calibrate a Honeywell BW MicroClip XL (GasAlertMicroClip XL, XT and X3): the bump test, the auto zero and auto span, what the error and CAL FAILURE messages mean, how to turn it on and off, how often to calibrate, and the calibration gas

To calibrate a Honeywell BW MicroClip XL: in clean air, press and hold the button through the OFF countdown, keep holding as the detector briefly deactivates and reactivates, and keep holding through the CAL countdown; the detector auto-zeroes the LEL, H2S and CO sensors and calibrates the oxygen sensor (do not apply gas until APPLY GAS shows), then you fit the calibration cap, open a 0.5 L/min regulator on the quad cylinder (CO 100 ppm, H2S 25 ppm, 50 percent LEL, 18 percent O2) and let the span run about two minutes until CAL DUE shows. Honeywell’s manual says bump test before each day’s use and calibrate at least every 180 days. An "Err" above a gas name is a failed sensor self-test; "error 02" is almost always Err over O2, the oxygen channel.

Bayshore Safety. Industrial safety and PPE supplier since 2017. · Current as of November 2026 · Honeywell BW GasAlertMicroClip XT / XL / X3 user manual (50120681-002, sections on activation, deactivation, bump test, calibration, factory alarm set points, startup and calibration troubleshooting and specifications); Honeywell BW MicroClip series datasheet; Honeywell BW IntelliDoX datasheet; the Honeywell BW product pages (automation.honeywell.com, fetched Nov 10 2026)
MicroClip XL and X3 detectors and the parts this guide namesGas detection selector
BW Technologies MCXL-XWHM-Y-NA MicroClip XL 4-Gas Monitor, LEL/O2/H2S/COBW Technologies MCXL-XWHM-Y-NA MicroClip XL 4-Gas Monitor, LEL/O2/H2S/COHoneywell BW lists the MicroClip XL at 18 hours per charge, IP68, 190 g, Class I Div 1 Groups A, B, C, D and a two-year warranty
$636.11See the product

Why the MicroClip gets its own page. It is the four-gas detector with one button, and that one button does everything: on, off, calibration, bump acknowledgement, alarm acknowledgement. The questions people ask (how do I calibrate it, what does the error mean, how do I turn it off, what is CAL FAILURE, what gas do I use) all come down to what the manual says that button does and what the screens mean, and this page quotes the GasAlertMicroClip user manual for each. The MicroClip XL and X3 share the manual with the older XT; where they differ (battery, oxygen sensor, warranty) the difference is stated. The parts the manual names, the sensors, cylinder, regulator, IR link and IntelliDoX dock, are in the band at current prices.

The MicroClip, question by question

Quotations are from the GasAlertMicroClip user manual and the MicroClip datasheet.

What is the MicroClip XL, and what does it detect?A one-button, four-gas personal detector for LEL (0 to 100 percent LEL or 0 to 5 percent methane by volume), oxygen (0 to 30 percent), hydrogen sulfide (0 to 100 ppm) and carbon monoxide (0 to 500 ppm), sold in configurations from a single oxygen channel to all four; the part number says which (XWHM is all four, XW00 is LEL and O2, 00HM is H2S and CO). Honeywell BW lists an 18-hour battery that recharges in under six hours, IP68, 190 g (6.7 oz) for the XL and 179 g for the X3, −4 to +122 °F, a 95 dB alarm, and a two-year warranty on the XL and three on the X3, whose oxygen sensor has a five-year expected life. The GasAlertMicroClip XT, the older model, had a 10-hour battery and a 4-hour charge. Approvals: CSA Class I, Div. 1, Groups A, B, C, D; ATEX II 1 G Ex ia IIC T4 Ga; IECEx Ex ia IIC T4 Ga.
How do I turn the MicroClip on and off?On: press and hold the button in clean air; the detector runs its start-up tests in order (battery, audible/visual, firmware, start-up message, alarm set points, sensor and power test, the optional auto-zero and O2 auto-calibration, the calibration due date, last calibration failed, overdue calibration, cal IR lock, bump test, last bump failed and force bump), then shows the gas readings. Off: "To deactivate the detector, press and hold C. The detector performs a sequence of two sirens with alternating flashes, vibrates, initiates the deactivation countdown, and displays OFF", with the note "If C is released before the countdown is complete, the detector will not deactivate." That note is the answer to most "it won’t turn off" questions: hold the button all the way through.
How do I bump test a MicroClip XL?The manual calls for a bump test of the sensors before each day’s use "to confirm their ability to respond to gas by exposing the detector to a gas concentration that exceeds the alarm setpoints". Apply the quad gas through the calibration cap, "ensure the visual, audible, and vibrator alarms activate", and when the gas is removed the detector stays briefly in alarm until the sensors clear. If the bump interval is set in Safety Suite Device Configurator the detector shows a bump test due screen at start-up (and with Force Bump enabled it will not enter normal operation until the bump passes); when the sensors pass it shows the days until the next bump. A bump cannot be run immediately after a calibration. The IntelliDoX dock runs and logs the bump automatically and is the method Honeywell’s guide points to.
How do I calibrate a MicroClip XL, step by step?The manual’s guidelines first: calibrate only in a safe area in 20.9 percent oxygen; "do not calibrate the detector during or immediately after charging"; let the detector stabilize one minute after activation (a used sensor 60 seconds, a new sensor 5 minutes, the X3 oxygen sensor 60 minutes); use a cylinder within its expiry date; and make sure the span values set in Safety Suite Device Configurator match the cylinder. Connect: a 0.5 mL/min-labelled regulator on the cylinder (the manual calls for a 0.5 L/min regulator, REG-0.5), the calibration hose to the calibration cap, the other end to the regulator. Procedure: 1. "Press and hold C. The detector performs the OFF countdown. Continue holding C as the detector briefly deactivates." 2. "The detector then reactivates and performs the CAL countdown. Continue holding C until the CAL countdown is complete." (Release early and the detector turns off.) 3. The hourglass flashes while the detector zeroes the combustible and toxic sensors and calibrates the oxygen sensor; "Do not apply calibration gas until APPLY GAS displays, otherwise the auto zero function will fail." When auto zero passes the detector beeps twice. 4. At APPLY GAS, fit the calibration cap, open the regulator and apply gas at 250 to 500 mL/min. 5. About 30 seconds after gas is detected the detector beeps once and completes the span, about two minutes. 6. CAL DUE shows and every sensor that passed resets its due date; a sensor that failed keeps its old span and its old due date. Press C at any time to abort.
What calibration gas does the MicroClip use?The manual’s list: "CO: 100 ppm balance N2; H2S: 25 ppm balance N2; LEL: 50% LEL or 2.5% by vol. methane balance air; O2: 20.9% balanced with N2" for the span settings, and in the calibration guidelines O2 18 percent by volume balance N2 for the span gas, with the auto zero done in clean air. Honeywell BW names a quad cylinder (CG-Q34-4, 34 L) and a 0.5 L/min fixed-flow regulator (REG-0.5), or a demand flow regulator with the IntelliDoX dock. The gas concentration entered in Safety Suite Device Configurator "must match the gas concentration value on the gas cylinder", and Honeywell asks for premium-grade, NIST-traceable gas.
How often should a MicroClip be calibrated?The manual: "Calibrate the sensors at least once every 180 days, depending on use and sensor exposure to poisons and contaminants", plus a bump test before each day’s use, a calibration of any new sensor before use, and a calibration whenever the gas readings vary at start-up. The calibration interval per sensor is set in Safety Suite Device Configurator (the detector ships with 180 days) and the detector counts down to CAL DUE at every start-up; with Force Calibration When Overdue enabled it will not run until calibrated, and without it you press C to acknowledge the warning. The sensor operational lives the manual prints (O2 2 to 3 years, 5 on the X3; LEL 2 to 3; H2S and CO 1 to 2) set the outer limit.
What does "error 02" or "Err" mean on a MicroClip XL?The MicroClip shows no numeric error codes; what reads as "02" is the oxygen channel. "If a sensor fails the self-test, Err displays above the gas type of the failed sensor. The detector will enter alarm. Press C to acknowledge the sensor alarm", and at start-up "Error and the sensor name displays". Err over O2 means the oxygen sensor failed its self-test, zero or span. The manual’s fixes, in order: let the sensor stabilize (60 seconds used, 5 minutes new, 60 minutes for the X3 oxygen sensor); calibrate it in clean 20.9 percent air (the O2 sensor is spanned at activation if O2 auto-calibration is on); "if error displays again, replace the sensor" (SR-X2V for the XL and the MC2-SS-K1 kit as listed). The other start-up screens: CAL FAILURE (the last calibration failed but the old calibration stays valid until the due date), BUMPCHK FAILURE, Calibration Overdue, IR Lock Enabled (calibration is locked to the IR link or IntelliDoX), Sensor Fail (bump test and reactivate; then calibrate; then replace), LOW BAT, and a plain OFF when the battery is too low, when forced calibration or bump is refused, or when every sensor fails.
Why does calibration fail, and what does "No Gas Detected" mean?From the calibration troubleshooting table. Auto-zero unsuccessful (an H2S, CO or LEL sensor fails to zero or the O2 sensor fails to calibrate): calibrate again; if ERROR repeats, replace the sensor. Auto span unsuccessful: make sure the sensor is enabled, the cylinder is not empty or expired and the regulator is working, then calibrate again; if it fails again, replace the sensor. No Gas Detected (nothing reaches the sensor within about 30 seconds of APPLY GAS): the sensor is disabled, the cylinder is empty or expired, or the regulator is wrong. Calibration Due Date Overdue after a calibration (a negative number of days): that sensor’s span failed and its due date did not reset. A sensor that fails to span "retains the previous span value, and does not continue with the calibration process".
What are the factory alarm set points?The manual’s sample factory set points, "as defined by OSHA" and varying by region: O2 19.5 percent low and 23.5 percent high; LEL 10 percent low and 20 percent high; CO 35 ppm low, 200 ppm high, 35 ppm TWA and 50 ppm STEL; H2S 10 ppm low, 15 ppm high, 10 ppm TWA and 15 ppm STEL. All are user adjustable in Safety Suite Device Configurator and are displayed at every start-up. The low and high alarms stop when the gas clears (press C if alarms are set to latch); a TWA or STEL alarm is stopped by turning the detector off and on or by clearing the exposure readings, and the manual says to confirm with your supervisor before clearing them.
How do I charge the MicroClip, and why won’t it charge?Charge only in a safe area between 32 and 113 °F with the Honeywell BW adapter (GA-PA-1-NA single, MC2-C01-MC5 five-unit cradle, or the vehicle adaptor). First charge 5 to 6 hours for the XL and X3; a normal charge the same. The troubleshooting table: if the charging indicator still shows charging after 6-plus hours the battery is trickle charging and is full; if the battery indicator does not show while charging, the pack is below normal and needs 8 hours, during which the LEDs may light; if it still does not show after 8 hours, or the indicator is missing after activation, contact Honeywell. About 20 percent capacity loss after 500 cycles is normal.
Does the MicroClip need the IR link or IntelliDoX?Not for a manual calibration or bump test, which the button and the calibration cap handle. The IR link (GA-USB1-IR) with Safety Suite Device Configurator is needed to change settings: span gas values, alarm set points, bump and calibration intervals, force bump and force calibration, the IR calibration lock, latching alarms, the datalog interval (15 seconds by default) and the language. If the Cal IR Lock option is on, the detector refuses a button calibration and must be calibrated through the IR link or in the IntelliDoX module. IntelliDoX (DX-MCLP for the MicroClip) bump tests, calibrates and configures the detector and transfers its logs; Honeywell lists it as compatible with the MicroClip series.
What is the difference between the MicroClip XL and the X3?Same detector and same manual; the X3 has the oxygen sensor Honeywell describes as extending expected service life to five years, a three-year warranty against the XL’s two, and a slightly lower weight (179 against 190 g). Its oxygen sensor needs 60 minutes to stabilize after a new fit, against 5 minutes on the XL. Both have the 18-hour battery and the IP68 rating.
How much does a MicroClip XL cost?By configuration: the four-gas XWHM in yellow or black, the three-gas and two-gas versions, and the single-oxygen version each have their own part number and price, which is on the row in the band; the X3 versions are priced on theirs.

The MicroClip XL in plain words

  • One button: hold to turn on; hold through OFF to turn off; hold through OFF and then CAL to calibrate; press to acknowledge alarms.
  • Bump before each day’s use with the quad gas; the alarms must sound, flash and vibrate.
  • Calibrate at least every 180 days in clean air, never during or just after charging; apply gas only when APPLY GAS shows.
  • Gas: CO 100 ppm, H2S 25 ppm, LEL 50 percent (2.5 percent methane), O2 18 percent; 0.5 L/min regulator; the values in the detector must match the cylinder.
  • "Err" above a gas is a failed sensor; stabilize, calibrate, then replace. "Error 02" is Err over O2.
  • Factory alarms: O2 19.5/23.5, LEL 10/20 percent, CO 35/200 ppm, H2S 10/15 ppm, adjustable.
  • Settings need the IR link and Safety Suite Device Configurator, or the IntelliDoX dock.
GasAlertMicroClip XT/XL/X3 user manual; MicroClip and IntelliDoX data sheets. Fetched Nov 10 2026.

Questions people ask

How do I calibrate my BW GasAlert MicroClip XL?

In clean air hold the button through the OFF countdown and the CAL countdown, let it auto-zero, then at APPLY GAS fit the cap and open the 0.5 L/min regulator on the quad cylinder; the span takes about two minutes and ends at CAL DUE.

What does the error "02" mean on a BW GasAlert MicroClip XL?

There is no code 02; it is Err over O2, a failed oxygen-sensor self-test or zero. Let it stabilize, calibrate in clean air, and replace the sensor if it repeats, as the manual directs.

How do I turn off a MicroClip XL?

Press and hold the button until OFF and the countdown finish; if you let go early it stays on.

How often should a MicroClip XL be calibrated?

At least once every 180 days per the manual, with a bump test before each day’s use and a calibration of any new sensor.

What calibration gas does the MicroClip XL take?

A quad mix of 100 ppm CO, 25 ppm H2S, 50 percent LEL (2.5 percent methane) and 18 percent O2, matching the span values set in the detector; Honeywell names the CG-Q34-4 cylinder and REG-0.5 regulator.

How do I bump test a MicroClip?

Apply the quad gas through the calibration cap until all three alarms activate; Honeywell says before each day’s use, and the IntelliDoX dock does it and logs it.

What does CAL FAILURE mean on a MicroClip?

The last calibration failed for a sensor; the previous calibration stays valid until its due date, and the detector asks for a new calibration (or refuses to run if Force Calibration is on).

Why won’t my MicroClip calibrate?

The manual’s causes: gas applied before APPLY GAS, an empty or expired cylinder, a bad regulator, a disabled sensor, calibration during or right after charging, or a sensor at the end of its life.

What are the MicroClip XL factory alarm set points?

O2 19.5 and 23.5 percent, LEL 10 and 20 percent, CO 35 and 200 ppm (TWA 35, STEL 50), H2S 10 and 15 ppm (TWA 10, STEL 15), adjustable and shown at every start-up.

How long does a MicroClip XL run?

18 hours per charge on the XL and X3 (12 hours at −4 °F), recharging in under six hours; the older XT ran 10 hours.

Can I change MicroClip settings without the IR link?

No; span values, set points, intervals and locks are set in Safety Suite Device Configurator through the IR link or the IntelliDoX dock.

Which sensor replaces the oxygen sensor in a MicroClip XL?

The Honeywell BW SR-X2V oxygen sensor listed in the band; the MC2-SS-K1 kit covers the sensor set. Calibrate any new sensor before use.

How much is a Honeywell BW MicroClip XL?

The price is per configuration on each row in the band; the four-gas version in yellow or black is the most common.

Related guides

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