4
O&M Manual
Rev F (8/17)
Part 1 - Introduction
1.1 General
The Model Q46/85 is an on-line monitoring system designed for the continuous measurement of
Peracetic Acid (PAA) concentration in solution. The full scale operating range of the system may
be selected by the user for 0-20.00 ppm, 0-200.0 ppm, or 0-2000 ppm, and the sensing system
will operate on water streams with temperatures ranging from 0 to 50°C. The Q46/85 PAA
Measurement System is engineered for applications in which PAA is applied to water for
sterilization purposes
The basic sensing element used in the PAA monitor is a polarographic membrane sensor which
measures PAA directly. Water simply flows past the sensor and directly to drain, with the flow
rate and pressure across the sensor controlled by a constant head flow cell assembly. The PAA
measurement does not alter the sample or add any chemicals to the sample stream, so the water
flow can return to the system if desired.
Q46/85 Monitors are available in two basic electronic versions, a 90-260 VAC powered monitor,
or a 12-24 VDC powered monitor – both with three relays and two 4-20 mA analog outputs. Both
versions allow flexible output options which include additional 4-20 mA current outputs, additional
0-30 VDC signal relays, PID control, and digital communication cards.
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