gazex MDP-4, Instruction Manual, Page: 18 / 24

failure operation
states of detectors states of outputs states modes
"Measuring screen” - displays the measured values of the output signals of the detectors. The
current values of 4-20mA output scaled to ranges and units specified by the user in the menu
timer
6.2.1 Signalled states of detectors’ outputs:
N – normal, – – detector switched on,
A1 – level 1 alarm in progress, A2 – level 2 alarm in progress,
T1 – TWA alarm in progress T2 – STEL alarm in progress;
A3 – exceeded the range,
H1 – level 1 alarm expired, H2 – level 2 alarm expired,
S – failure of signal line (break),
Pr – power supply failure (no or too high detector’s supply current), shorting of signal line.
C – recommendation of detector’s calibration (detector operates, is in normal condition, by
the recommended calibration deadline has elapsed.
6.2.2 Measuring ranges and units of detectors, depending on the measured medium:
Measuring range
(scaled to 4-20 [mA])
The accuracy
of the threshold
alarm
adjustment
Medium
0 – 100 [% meas.range] 1
undefined medium, the default type
0,0 – 25,0 [mA] (no scale) 0,5
undefined medium, DEX - the threshold
detector, A1 and A2 alarm thresholds
0 – 100 [%LEL] EX 1 explosive gas, DEX-nK, catalytic sensor
0 – 500 [ppm] CO 10 carbon monoxide
0 – 100 [ppm] NH3 1 ammonia
0 – 100 [ppm] H2S 1 hydrogen sulphide
0,0 – 25,0 [v/v] O2 (UP) 0,5 oxygen
0,0 – 25,0 [v/v] O2 (DOWN) 0,5
oxygen
0,0 – 20,0 [ppm] ETO 0,5
ethylene oxide
0,0 – 100,0 [ppm] NO 1
nitric oxide
0,0 – 20,0 [ppm] NO2 0,5
nitric dioxide
0 – 1000 [ppm] H2 10
hydrogen
0,0 – 20,0 [ppm] SO2 0,5
sulphide dioxide
0,0 – 10,0 [ppm] CL2 0,5
chlorine
0,0 – 25,0 [mA] (no scale) 0,5
undefined medium, BIN - the threshold
detector, A1 and A2 alarm thresholds
0,0 – 25,0 [v/v] O2 (DOWN,UP) 0,5
oxygen
0 – 2,00 [v/v] CO2 10
carbon monoxide
0 – 100 [%LEL] IR 1
explosive gas, DEX-nR, infra-red sensor
MDP-4(8,16)… Instruction Manual edition 6PU63en
©gazex’2011 v1101
Page 18 / 24