5
O&M Manual
Rev-J (8/17)
Part 1 - Introduction
1.1
General
The Model Q46D is a versatile on-line monitoring system designed for the
continuous measurement of dissolved oxygen in solution. The full scale
operating range of the system 0-40 ppm, and the sensing system will operate on
water streams with temperatures ranging from 0 to 50
°
C.
While the Q46D may be used with either optical oxygen or galvanic membrane
sensors, this manual is specific for systems utilizing ATI’s optical D.O. sensor.
Q46D Monitors are available in two electronic versions, an AC powered monitor
with integral alarm relays and dual 4-20 mA output capability, and a 12-24 VDC
unit with dual output and relays. Options are available to add either a third 4-20
mA output or 3 additional low power SPST relays. In addition, a digital output
option for Profibus, Modbus, or Ethernet is available.
1.2
Standard System
The standard model Q46D system includes two components, the Q46D analyzer
and an optical dissolved oxygen (ODO) sensor. For connection of the sensor to
the electronics, a 30' (9 m) cable is supplied. Up to a total length of 200 feet (61
m) of cable may be added using #07-0100 junction box and #31-0038 cable.
1.3
Features
·
Q46D monitors are available in either 90-260VAC or 12-24 VDC power supply
systems. All features remain the same in both variations
·
High accuracy, high sensitivity system, measures from 0.1 ppm to 40.0 ppm
through 2 internal automatic ranges.
·
Output Hold, Output Simulate, Output Alarm, and Output Delay Functions. All
forced changes in output condition include bumpless transfer to provide gradual
return to on-line signal levels and to avoid system control shocks on both analog
outputs.
·
Units provide provides three SPDT relay outputs and two isolated analog
outputs. Software settings for relay control include setpoint, deadband, phase,
delay, and failsafe.
