ATI
Q46P pH System
Part 4 – Electrical Installation
35
O&M Manual
Rev-F (8/17)
4.9
External Preamplifier
An external preamplifier (part no. 00-1391) is available which allows the use of
conventional pH sensors long distances from the Q46P electronics. This preamp is
housed in a NEMA 4X enclosure and must be located within 25 ft. of the pH sensor. It is
critical that any conduit entry installed in this enclosure be completely sealed. Moisture
entering the enclosure through a conduit will cause failure of the amplifier circuit. Use of
this preamp. allows the Q46P to be located up to 300 metres from the sensor/preamp.
installation location. Wiring for that system is shown below.
Figure 28 - External Preamp for Conventional Sensor Wiring
