Optosense LLC
USER MANUAL
Design department
SMALL-SIZE EXPLOSIVE GAS MEASURING
SENSOR MIPEX-02-X-X-X.1 X (RX)
ESAT.413347.005 UM
Revision 3.0
January 19th, 2017
Page 40 of 46
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2.3. stop feeding CGM #1 into sensor atmosphere;
2.4. manual zeroing complete.
3. Start feeding CGM #2 into sensor atmosphere.
4. One minute after CGM #2 was supplied, send <CALB AAAA> command, where AAAA is
a value of CGM concentration (e.g. value 0198 corresponds to 1.98% vol.). Thereafter
scaled concentration value C
1
becomes equal to the sent value AAAA. Scale coefficient
is stored in sensor microcontroller memory until the next span calibration. Before
sending command <CALB AAAA>, ensure the following conditions:
4.1. entered concentration value must not deviate from the current readings of
more than 20 times and also must not be less than 11:
(C ⋅ 20 > C
1
> C ⋅ 0.05) && C > 10
4.2. CGM must contain more than 0.2% vol. of target gas;
4.3.
if these conditions are not met, sensor responds “CALB AAAA FAULT”.
5. Stop feeding CGM #2 into sensor atmosphere.
6. Feed CGM #3 into sensor atmosphere and check sensor readings.
7. For methane sensors calibrated up to 100% vol. repeat the procedure steps 3, 4 and 5
with CGM #4.
If requirements to sensor readings variation are not met in accordance with Table 6, zeroing
and span calibration procedure should be repeated. In case of the repeated mismatch between
sensor readings and target gas concentration value in
СGM #3, sensor should be sent to the
manufacturer for repair or replacement.
PC
PC
USB cable
CGM
MIPEX-02/03 interface board
Gas adapter
MIPEX-02
Fig. 17. Typical scheme of MIPEX-02 span calibration
Converting of % vol. to % LEL is performed according to the following equation:
LFSCL =
100 × C
C(h)
,
where:
LFSCL
is component concentration, % LEL;