EDS/C and EDS/P Transmitters
SAFE AREA HAZARDOUS AREA
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BLUE |
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| +VE I/P |
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| 0.1 – 0.5V o/p | |
G/Y |
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ED810
INITIAL SETUP
Power/OutputSensor
TerminalsTerminals
EDS/C orP TRANSMITTER
Blue
Brn
Grn/Yel SENSOR
It is vitally important that the ED810 and EDS/C or P transmitter are calibrated together ensuring that the ED810 indicates an alarm at the correct concentration. After installation is complete the following setup procedure should be followed matching the EDS/C or P, ED810 and cable run together.
EDS/C
1.At EDS/C transmitter measure between – I/P and + I/P, ensure voltage reading is in the range 4.75 – 5.4V with a digital volt meter.
2.Using the correct calibration gas for your low alarm, ensure the calibration of the EDSC Transmitter using the EDSC calibration instructions. Whilst the EDSC is giving the correct output go to the ED810 control unit and adjust the A1 (located under the A1 light, accessed through the front panel) potentiometer until the A1 light just illuminates. Rotating clockwise increases sensitivity until the A1 light just illuminates, if the light comes on prematurely wind anticlockwise whilst continuously pressing the reset switch until the light goes out and then clockwise until it just illuminates.
3.Using the correct calibration gas for your high alarm, ensure the calibration of the EDSC Transmitter using the EDSC calibration instructions. Whilst the EDSC is giving the correct output go to the ED810 control unit and adjust the A2 (located under the A2 light, accessed through the front panel) potentiometer until the A2 light just illuminates. Rotating clockwise increases sensitivity until the A2 light just illuminates, if the light comes on prematurely wind anticlockwise whilst continuously pressing the reset switch until the light goes out and then clockwise until it just illuminates.
Example of calculating expected output voltage
The output of the EDSC* ranges from 0.1 to 0.5V (zero to full scale). If Full scale is 1000ppm NH3 then :
250ppm output : (0.4 x 0.25 + 0.1) = 0.2V
500ppm output: (0.4 x 0.5 + 0.1) = 0.3V
1000ppm output: (0.4 x 1 + 0.1) = 0.5V
8 | ED810 INSTRUCTION MANUAL |