Mipex MIPEX-02 1 Series, User Manual

Page: 36 / 38

OPTOSENSE LLC
Design Department
USER MANUAL
SMALL-SIZE EXPLOSIVE GAS MEASURING SENSOR MIPEX-02-
Х-X-X.1 X
File name: ESAT.413347.006 UM v.2.0.docx Revision 2.0 27 August 2015 Page. 36 of 38
THE SOLE PROPERTY OF OPTOSENSE LLC. ANY REPRODUCTION WITHOUT THE WRITTEN PERMISSION OF OPTOSENSE LLC IS PROHIBITED.

Proceed operations pointed below as**, only if sensor has 0-100 % Vol. measuring
range or up to 100%Vol. indication range.
Use the following sequence to make scaling:
1. Send DATAE
and check, that status byte in response is “0”.
2. To set up the first coefficient send CALB1 XXXXX command in ASCII and check, that
response is CALB1 XXXXX OK . Where XXXXX is scaling coefficient, i.e. 20000.
3. ** To set up the second coefficient send CALB2 YYYYY command in ASCII and
check, that response is CALB2 YYYYY OK .
By default, scaling coefficients are XXXXX = YYYYY =10000, that means of no scaling. Do not
apply span gas while scaling.
For example, if it is needed to get readings of CH4 in %LEL, normalized to 1000 (reading
1000 corresponds to 100% LEL of CH4) send CALB1 20000.
Use the following sequence to span gas calibration procedure:
1. Make Manual zeroing procedure.
2. Fill up the sensor with span gas in the range up to 5%Vol (recommended in mid of
range, e.g. 2.5% Vol. CH4).
3.
Wait until status byte becomes “0” and gas reading stabilized, sending DATAE
commands and checking their responses.
4. Send CALB AAAA command in ASCII (43h; 41h; 4Ch; 42h; 20h; AAh; AAh; AAh;
AAh; 0Dh in HEX), where AAAA is gas concentration, normalized to 1000 (i.e.
AAAA =0250 for 2.5% Vol CH4). Span gas concentration must be more than 0.1%
Vol. Otherwise the sensor will return FAULT in response. Check, that response is
CALB AAAA OK .
5.
Repeat operations in items 3… 4 of current procedure with span gas in range of 5-
100%Vol (recommended in mid of range, e.g. 50% Vol CH4), if sensor has
measurement range up to 100% vol. CH4. No need to calibrate second range, it is
out of use.
List of CGM used for checking IR gas sensors MIPEX-02
The recalculation to % of LEL shall be effected in accordance with the following formula for
concentration expressed in volume fraction, vol. %:
 


100 C
LFSCL ;%
C h
where
LFSCL is % LEL
С – component content in volume fraction, vol. %;
С(h) – LEL of component, % (constant);
С(h)
= 4.4 %
– for methane;
С(h)
= 1.7 %
– for propane.