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58
M U L T I G A S D E T E C T I O N
APPENDIX A.
SPECIFICATIONS
(2) The actual gas concentration applied to an instrument, when an LEL reading is
observed.
Gas concentration applied (LEL) =
Instrument reading (LEL) x relative span of calibration gas
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relative span of gas applied
Example 2: An instrument, calibrated to methane, reads 22%LEL when exposed to
propane. What is the level of propane being applied?
Calculation: 22 x 100 = 34.9%LEL propane
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N. GENERAL
Sample Flow Rate
:
The pump in the Mi samples at 450 cc/minute. Use of the supplied sampling
accessories requires the user to be aware that delay time will occur based on the length
of tubing. Refer to
Section 4.5 Remote Sampling
(Pretesting) for details. If the sample flow
is restricted or below pre-determined limits, the Mi will indicate a flow failure
alarm and for safety reasons will automatically switch to diffusion mode. In diffusion
mode, the sampling pump does not operate but the instrument is fully operational and
will sense the atmosphere surrounding the instrument.
Refer to
Section 8.8 Pump Inlet Filter Replacement
for maintenance.
DO NOT USE non-standard sampling tube or fittings.
Storage
:
Temperature Range:
-20 degrees C to + 50 degrees C
(-4 degrees F to + 122 degrees F)
Humidity Range:
0-95% (Noncondensing)
Expected Life:
Instrument - 5 Years
Sensors - 2 Years
Batteries - NiMH 2 Years
Oxygen Enriched Atmospheres:
This instrument is safe for use in normal oxygen (20.9%v/v) atmosphere. In enriched
oxygen atmospheres (above 21%) extreme caution should be exercised as electrical safety
certification is not applicable nor has it been tested as being safe to use in such
atmospheres.
Oxygen Deficient Atmospheres:
The LEL readings cannot be relied upon in atmospheres deficient of oxygen. For example,
most catalytic sensors cannot be relied upon when oxygen is lower than 10% v/v.
Use extreme caution when the oxygen readings are below 10% v/v and do not enter any
confined space when oxygen alarm is operating and/or reading shows less than 19.5% v/v.
APPENDIX B.
TURN-ON SEQUENCE
Max time from “Turn On” to “Ready” does not exceed 80 seconds.
DISPLAY
LED
SPEAKER
MICROMAX PLUS
VER 1.0
ON
TESTING
PLEASE WAIT
ZEROING
PLEASE WAIT
IF ”AUTO
ZERO” IS ON
(DEFAULT=ON)
BEEP
BEEP
BEEP
1 FLASH
