IE-SNC-T81(2)xx-01
7
Error 2
- there is a reading „Err2“ on LCD display. The CO
2
concentration measurement error
or temperature error occurred.
Error 3 -
there is a reading „Err3“ on LCD display upper line. Error of internal A/D converter
appeared (converter does not respond, probably damage of A/D converter). At this state
device does not measure temperature and relative humidity. This error does not affect CO
2
concentration measurement. It is a serious error, contact distributor of the device.
Error 4 -
there is a reading „Err4“ on LCD display. It is internal device error during
initialization of CO
2
sensor. Under this condition device does not measure concentration of
CO
2
. Value read from device is -9999. CO
2
sensor is probably damaged. It is a serious error,
contact distributor of the device. This error message is displayed also in case, when the device
is connected to the PC via the optional SP003 communication cable and external power
supply is not used.
Technical parameters
T8148
– temperature and CO
2
concentration transmitter
Output:
4 to 20 mA
Power voltage:
9 to 30 V
Power consumption:
1
W during normal operation
max. 4
W for 50 ms with 15 s period
Output in case of error:
<3.8 mA or >24 mA
Temperature:
Accuracy:
± 0,5 °C
Range:
0 to +50 ºC
Resolution:
0,1 °C
Response time:
t90 < 12 min (air flow approximately 0,3 m/s)
t90 < 25 min (no air flow)
Concentration of CO
2
:
Accuracy:
± (50 ppm + 2 % of measuring value) at 25°C (77°F) and 1013 hPa
Range:
0 to 2000 ppm
Temp. dependence: typ. 2 ppm CO
2
/ ºC in the range 0 to 50 ºC (32 to 122°F)
Long term stability: typ. 20 ppm / year
Resolution:
1 ppm
Response time:
t90 < 195 s in „SLOW“ measurement mode
t90 < 75 s in „FAST“ measurement mode
T8248
– temperature and CO
2
concentration transmitter
Output:
0 to 10 V
Power voltage:
15 to 30 V
Power consumption:
0,5
W during normal operation
max. 3
W for 50 ms with 15 s period
Output in case of error:
<-0.1V or >10.5V
