Mipex MIPEX-04, User Manual, Page: 35 / 41

Optosense LLC USER MANUAL
Design department MIPEX-04 ULTRA-LOW POWER INFRARED GAS SENSOR
ESAT.100000.00.02 UM Revision 02 December 12th, 2016 Page 35 of 41
THE SOLE PROPERTY OF OPTOSENSE LLC. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF OPTOSENSE LLC IS PROHIBITED.
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
CGM
Interface board
Gas
adapter
Micro-USB cable
MIPEX-04
Fig. 12. Typical scheme of MIPEX-04 span calibration
Converting of % vol. to % LEL is performed according to the following formula:
LFSCL =
100 × C
C(h)
,
where:
LFSCL
– component concentration, % LEL;
С
– component concentration, % vol.;
С(h)
– the lower explosive limit of component, % vol. (constant).
For methane
C(h) = 4.4%
vol.; for propane
C(h) = 1.7%
vol.