ATI
Q46H/65 Residual Chlorine Dioxide System
Part 4
– Electrical Installation
27
O&M Manual
Rev-J (11/18)
4.6
Optional pH Input
The Q46H may be configured for pH measurement if desired. To utilize the feature, a pH sensor
must be connected to terminals 3 and 5 as shown Figure 18
. Note that jumpers are installed at the factory between terminals 3 and 5, and terminals 6 and 9.
When no pH sensor input is connected, these jumpers reduce the potential for noise pickup in the
circuit.
Remove the jumpers if a pH sensor is added.
Two types of pH sensors are available for connection to the Q46H/62 monitor. A battery powered
sensor with internal preamp, #07-0096, provides an amplified signal of 0.3
– 1.5 VDC. A
standard pH sensor without preamp, #63-0101, is also available, but the maximum cable length
for this sensor is 25 ft. (7.5 m.) When this sensor is used with the constant-head flowcell, an
adapter is supplied to allow the sensor to sit in the inlet chamber.
If pH measurement is to be used, the pH input feature must be enabled and the correct pH
sensor type must be selected in the Configuration Menu.Ifa63-0101 sensor is used, select Sensor
Type #1. If you are using an 07-0096 sensor (Q22P), select Sensor Type #2. See diagram on the
next page for sensor hook-up information.
Note that a junction box may not be used with a 63-0101 pH sensor.
