EDS/P
1.At EDS/P transmitter measure between – I/P and + I/P, ensure voltage reading is in the range 4.0 – 5.4V with a Digital volt meter.
2.Using the Zero adjustment potentiometer on the EDS/P, rotate clockwise until the 50%
lamp is just illuminated or 0.3V is measured on the O/P terminal w.r.t 0V.
4.Go to the ED810 Control unit and adjust the A1 potentiometer (located below the A1 light and accessed through the front panel) 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.Back at the EDS/P again using the Zero adjustment potentiometer on the EDS/P, rotate clockwise until the 100% lamp is just illuminated or 0.5V is measured on the O/P terminal w.r.t 0V.
4.Go to the ED810 Control unit and adjust the A2 potentiometer (located below the A2 light and accessed through the front panel)until the A2 light just illuminates.
5.Using the EDS/P instructions return the output to Zero and calibrate the sensor. Remember the Sensor requires a minimum of 24 hours to settle otherwise the calibration WILL NOT be accurate.
Example of calculating expected output voltage
The output of the EDSP* ranges from 0.1 to 0.5V (0 to full scale). If Full scale is 10,000ppm NH3 then :
2,500ppm output : (0.4 x 0.25) + 0.1 = 0.2V
5,000ppm output: (0.4 x 0.5) + 0.1 = 0.3V
10,000ppm output: (0.4 x 1) + 0.1 = 0.5V
*The output range stated is correct when the EDSC / EDSP is connected to the ED810, if tested separately the output range will be 0.2 to 1.0VDC.
ED810 INSTRUCTION MANUAL | 9 |