Guidelines

Caution

If adjustments are made to the real-time clock, the calibration due date will be invalid for the

• GasAlert Extreme,
• GasAlertMicro,
• GasAlertMicro 5/PID/IR,
• GasAlertMicroClip,
• GasAlertMax XT detectors.

Recalibrate the detector immediately.

When calibrating the sensors, adhere to the following guidelines:

• Recommended gas mixture:
  O2: clean air, 18% vol.
  CO: (low H2 sensitivity): 50 to 500 ppm balance N2
  CO: 50 to 500 ppm balance N2
  H2S (high range): 10 to 100 ppm balance N2 H2S (low methanol): 10 to 100 ppm balance N2
  H2S: 10 to 100 ppm balance N2
  PH3: 1 to 5 ppm balance N2
  SO2: 10 to 50 ppm balance N2
  NH3: 20 to 100 ppm balance N2
  NH3: (high range) 20 to 100 ppm balance N2
  NO2: 5 to 50 ppm balance N2
  HCN: 5 to 20 ppm balance N2
  ETO: 5 to 50 ppm balance N2
  NO: 10 to 250 ppm balance N2
  Cl2: 3 to 25 ppm (for bump checks only)
  VOC: 100 ppm isobutylene
  CO2: 5000 ppm balance air or 0-5.0 % v/v CO2
  LEL: 10 to 100% LEL or 0.5 to 5% by vol. methane balance air
• Calibrate only in a clean atmosphere that is free of background gas. Do not operate the base station in a hazardous area. Failure to adhere to this guideline can result in possible personal injury and/or property damage.
• JJS recommends using premium grade calibration gases and cylinders that are certified to National Standards. The calibration gases must meet the accuracy of the detector.
• Do not use a gas cylinder beyond its expiration date.
• All calibration cylinders must be used with a demand flow regulator and must meet the following maximum inlet pressure specifications:
• Disposable cylinders 0-1000 psig/70 bar
• Refillable cylinders 0-3000 psig/207 bar
• Do not calibrate the detector during or immediately after charging is complete.
• For ETO sensors (before each work shift) allow the detector to fully stabilize in the temperature that it will be operated in, and then zero the detector.
• It is necessary to periodically re-zero the ETO sensor.
• Calibrate the sensor if the ambient gas display varies during start-up.
• Calibrate a new sensor before use. Allow the sensor to stabilize before starting calibration:
  • Used sensor: 60 seconds
  • New sensor: 5 minutes.
• Before calibrating a new NO or ETO sensor, allow the sensor to stabilize for 2 hours in a safe area that is free of gas.
• Calibrate the sensors at least once every 180 days, depending upon use and sensor exposure to poisons and contaminants. For HCN sensors, calibrate at least once every 90 days.
• Calibrate the sensor before changing the alarm setpoints.
• When calibrating multiple times, wait 10 minutes between calibrations to allow the sensor to stabilize.
• If a certified calibration is required, contact JJS Technical Services.

Calibration Procedure (All models excluding the GasAlertClip Extreme)
A calibration adjusts the sensitivity level of a sensor to ensure an accurate response to gas.

Caution

Ensure the detector is not in a low battery state prior to performing a calibration.

The base station automatically accepts an unusually large span adjustment notification for the GasAlertMicro 5/PID/IR. Refer to the GasAlertMicro 5/PID/IR User Manual.
The following detectors transfer their event logs to the base station MMC during a or calibration:

• GasAlert Extreme
• GasAlertMicroClip
• GasAlertMax XT

To perform a calibration, complete the following:
1. Ensure the MMC/SD card is inserted if datalogging is required.
If the MMC/SD card is not inserted, displays on the LCD when the base station attempts to log the results of the calibration. If required, refer to Inserting/Replacing a MMC/SD Card.
2. Activate the detector and wait until it is in normal operation. Insert it into the docking module.
3. Activate the base station and wait until it is in normal oepration.
4. Press CALIBRATION on the corresponding docking module.

Note

For calibration procedures for the GasAlertMicro 5 IR with CO2 sensor, refer to GasAlertMicro 5 IR with CO2 Sensor

If calibration is initiated while in the user options menu: Calibrations are initiated after exiting the user options menu.
If more than one docking module is queued: If more than one docking module is queued for calibration, the first module queued begins the calibration.
The RUN LED flashes yellow on the remaining docking modules that are queued for calibration. When the first docking module is complete, the next module in the queue begins calibration.

The base station begins the calibration and displays the

• docking module,
• test being performed,
• detector type, and
• detector serial number.

Note

The GasAlertMicro 5/PID/IR beeps and flashes two times when calibration begins, and the GasAlertMicroClip and GasAlertMax XT beeps and flashes once.

Warning

If the Automatic Datalog Download (GasAlertMicroClip and GasAlertMax XT only) is enabled in Fleet Manager II, data transfer automatically begins during the purge. Do not remove the detector until the DATA TRANSFER PASS LED lights, otherwise the transfer will fail.

5. If there is a gas conflict or a selected gas cannot be found, refer to Gas Conflicts.
6. If there are no gas conflicts, the base station then applies the gas.

If more than one gas is being applied, the base station performs a purge between each gas. Depending upon the gas type, the purge time(s) will vary.

Note

If Automatic Datalog Download is enabled in Fleet Manager II, the GasAlertMicroClip and GasAlertMax XT automatically deactivate after the transfer is complete. To bypass the shutdown, remove the detector within 15 seconds after the DATA TRANSFER PASS LED lights.
7. Refer to Calibration Results.

GasAlertMicro 5 IR with CO2 Sensor

Note

If calibrating a GasAlertMicro 5 IR detector, the base station automatically zeroes and then calibrates the CO2 sensor first.
1. The base station zeroes the CO2 sensor. The CO2 sensor can only be zeroed using nitrogen (N2).
Ensure N2 has been configured to an inlet. If required, refer to Inlet Setup.
2. The base station applies the gas.

3. The base station then purges the N2 before applying the CO2 gas.

4. The base station then applies the gas to the CO2 sensor.

5. The base station then begins calibrating the remaining sensors. For more information, refer to Automatic Datalog Download (GasAlertMicroClip and GasAlertMax XT only).

6. After calibration is complete, the base station displays the results and performs a final purge to clear any remaining gas.

The countdown of seconds remaining displays beside Purge.

Note

After calibration, the GasAlertMicro 5/PID/IR automatically deactivates. To bypass the automatic shutdown, remove the detector within 15 seconds after the final purge begins.

Calibration Results

After the calibration is complete, the base station LCD displays the results.

	Pass
	Fail
	No gas found (H2S is used as an exam- ple, this applies to all gases)
	Sensor is disabled

Calibration Pass

and Pass indicates that the calibration has passed. The detector is now ready for use. Press OK to return to normal operation.

Calibration Fail

If calibration fails, displays beside the applicable gas.
Example: H2S

Incorrect Inlet Setup

If an inlet is not setup correctly during a calibration, the base station displays Fail and a hyphen () beside the gas type.

Example: H2S, CO, and LEL gases were not detected.

If a test gas fails, verify that the

• gas cylinder is not empty,
• connections are attached correctly, and
• inlets are setup correctly

If the detector fails an audible or visual test fails, displays beside the applicable test (AUD or VIS). For information regarding solutions, refer to Troubleshooting.

Sensor Disabled

Warning

To prevent personal injury and/or property damage, replace the sensor immediately. Refer to the corresponding detector user manual for sensor replacement procedures.

If a sensor is disabled, results from the sensor do not display on the base station LCD. displays where the gas type typically displays on the LCD.

Note

If a sensor is disabled, it will not be recorded in the results log.