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ED810 INSTRUCTION MANUAL 27-02-07 8
EDS/C and EDS/P Transmitters
INITIAL SETUP
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
BROWN
G/Y
SAFE AREA HAZARDOUS AREA
Grn/Yel
Blue
Brn
Sensor
Terminals
-VE I/P (0V)
+VE I/P
0.
1
–
0
.
5
V
o/p
Power/Output
Terminals
BLUE
EDS/C orP TRANSMITTER
SENSOR
ED810