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NOTE

M88 Detector must be tested using a confidence sample to verify correct operation. Detector is ready to test 5 minutes after S (Sampling) indicator (green) is on continuously.

Simulants used in confidence sample are non-hazardous because of limited quantities used and they are contained within confidence sample container.

If confidence sample testing is to be performed in cold weather, place confidence sample inside outer clothing to keep warm.

2.9.4.1 If M42 Remote Alarm(s) is connected to M88 Detector, verify that M42 Remote ALARM RED Lamp flashes when the M88 Detector alarms. Also, the M42 Remote Alarm(s) horn will sound with selector switch to HORN ON position. The horn will not sound with the selector switch set to HORN OFF position.

2.9.4.2 G Simulant Confidence Test.

2.9.4.2.1 Remove inlet rain cap (if installed) before doing the confidence sample test.

2.9.4.2.2 Open G vapor shroud (1) of confidence sample (2). The alternate confidence sample style (4) does not have vapor shrouds.

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1

NOTE

Confidence sample should be applied to the M88 Detector, for only a BRIEF MOMENT (approximately 1/4 of a second). The vapor vent should be placed on the INLET and IMMEDIATELY REMOVED. Do not wait for bars to display or alarm to sound.

2.9.4.2.3 Place G end vapor vent of confidence sample (2) in contact with INLET (3) for approximately 1/4 of a second. If using alternate confidence sample, place “G” tip of sample (4) directly over the INLET (3) and plunge downward for ¼ of a second.

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ARMY TM 3-6665-321-12&P

2.9.4.2.4 Withdraw confidence sample and close vapor shroud.

2.9.4.2.5 Reinstall rain caps, if operating in wet or dusty conditions.

NOTE

If humidity conditions inside M88 Detector are very dry, both bargraphs will respond to confidence sample. The M88 Detector is still working properly.

2.9.4.2.6 After a few seconds have elapsed, verify that at least three G bars are lit, ALARM light is lit (flashing), and audible alarms on both M88 Detector and M42 Remote Alarm sound. If alarm light is flashing, proceed to paragraph 2.9.4.2.10.

2.9.4.2.7 If less than 3 G bars were displayed during test, wait 5 minutes and repeat procedures, detailed in paragraphs 2.9.4.2.1 through 2.9.4.2.4.

2.9.4.2.8 If less than 3 G bars continue to be displayed, set selector switch to “0” position and repeat initial checks, self-test, and confidence sample procedures detailed in paragraphs 2.9.2 through 2.9.4.2.6.

2.9.4.2.9 If less than 3 G bars continue to be displayed, leave M88 Detector switched ON for 30 minutes. Then repeat confidence sample test as detailed in paragraph 2.9.4.2.1 through2.9.4.2.4. If less than 3 bars continue to be displayed, M88 Detector should be shutdown (paragraph 2.10). Refer to troubleshooting (paragraph 3.3, malfunction 7).

2.9.4.2.10 Alarm light will flash and audible alarm will sound (if switch is set to 1+ ) for the duration, if either G or H bar graph lights 3 or more bars. If more than 5 bars are displayed in either G or H bar graph, unit will enter clear-down and may need up to 5 minutes to clear. The highest level will be displayed until M88 Detector finds a level of 3 bars or less. If excessively dosed, clear-down may take longer than 5 minutes.

The following events will occur during 5 minute clear-down period:

• S (Sample) indicator (green) is flashing.

• M88 Detector stops sampling external air and internally recirculates sample air through a filter pack.

• After clear-down, normal external sampling will re-start.

• Levels of 3 bars or less allow detector to start sampling.

• S (Sample) indicator (green) stops flashing and is lit continuously.

• Alarm and lights on both M88 Detector and M42 Remote Alarm will continue to sound and flash.

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2.9.4.2.11 If M88 Detector continues to alarm for more than 10 minutes after withdrawing confidence sample (paragraph2.9.4.2.4), refer to troubleshooting (paragraph 3.3, malfunction 5).

2.9.4.2.12 M88 Detector is ready for H simulant confidence test when red ALARM light is no longer lit and S (Sample) indicator is lit continuously (not flashing).

2.9.4.3 H Simulant Confidence Test.

NOTE

Do not allow the M88 Detector to sample the confidence sample for more than one second because this will prolong clear-down time.

If confidence sample has just been removed from a sealed package, it is possible for M88 Detector to display bars on G agent bargraph during the H simulant confidence test. The two simulants may mix in package.

2.9.4.3.1 Repeat procedures detailed in paragraphs 2.9.4.2.1 through 2.9.4.2.5 using H end simulant of the confidence sample. Do not expose simulant to the inlet for more than one second.

NOTE

If humidity conditions inside M88 Detector are very dry, both bargraphs will respond to the confidence sample. M88 detector is still working properly.

At temperatures of -18ºC and lower the M88 Detector may not respond to the H simulant confidence check. The M88 Detector is still working properly. Proceed to paragraph 2.9.4.3.4.

2.9.4.3.2 After a few seconds, verify at least three H bars are lit, ALARM light is lit (flashing), and audible alarm on both M88 detector and M42 Remote Alarm are sounding. If alarm light is flashing, proceed to 2.9.4.3.2.3.

2.9.4.3.2.1 If less than 3 H bars are displayed, wait 5 minutes and repeat only once paragraphs 2.9.4.3.1 and 2.9.4.3.2.

2.9.4.3.2.2 If less than 3 bars continue to be displayed, shutdown M88 Detector (paragraph 2.10). Refer to troubleshooting (paragraph 3.3, malfunction 7).

2.9.4.3.2.3 ALARM light will flash and audible alarm will sound (if switch is set to 1+ ), for the duration if either G or H bar graph lights 3 bars or more.

2.9.4.3.2.4 If more than 5 bars are displayed in either G or H mode, unit will enter clear-down and may need up to 5 minutes to clear. The highest level will be displayed until M88 Detector finds a level of 3 bars or less. If

excessively dosed, clear down may take longer than 5 minutes.

ARMY TM 3-6665-321-12&P

The following events will occur during the 5 minute clear-down period:

• S (Sample) indicator (green) is flashing.

• M88 Detector stops sampling external air and internally recirculates sample air through a filter pack.

• After clear-down, normal external sampling will re-start.

• Levels of 3 bars or less allow detector to start sampling.

• S (Sample) indicator (green) stops flashing and is lit continuously.

• Alarm and light on both M88 Detector and M42 Remote Alarm will continue to sound and flash.

2.9.4.3.3 If M88 Detector continues to alarm for more than 10 minutes after withdrawing confidence sample, refer to troubleshooting (paragraph 3.3, malfunction 5).

2.9.4.3.4 M88 Detector is ready for operation when red ALARM light is no longer lit and S (Sample) indicator is lit continuously (not flashing).

If the following weather or climate conditions change during M88 Detector operation, perform the following procedures immediately.

2.9.4.3.5 In rain, ensure rain caps are installed (paragraph 2.13).

2.9.5 Audible Alarm Disabled.

NOTE

If audible alarm is not required for operation, set selector switch to 1. Only the visual alarm will be displayed during alarm conditions. If selector switch is set to 1, and M88 Detector alarms, M88 Detector audible alarm WILL NOT SOUND. If M42 Remote Alarms are connected, they will alarm either audibly or visually depending on the M42 Remote Alarm selector switch setting.

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