ATI
Q46H/65 Residual Chlorine Dioxide System
Part 1 - Introduction
8
O&M Manual
Rev-J (11/18)
1.3
Features
Standard Q46H analyzers have fully isolated inputs and outputs. Analog outputs are additionally
completely isolated from each other.
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 20 ppb to 200.0 ppm through 4 internal
automatic ranges. User ranges of 200.0 ppb, 2.000 ppm, 20.00 ppm, or 200.0 ppm.
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.
Three6 amp SPDT relay outputs and two analog 4-20 mA outputs are standard. Software
settings for relay control include setpoint, deadband, phase, delay, and failsafe. An optional 3-
relay card for low voltage signalsis available to bring the total to 6 relays.
Selectable PID controller on main analog output. PID controller can operate with instrument
configured as loop-power analyzer or as one of the two outputs on the AC powered instrument.
PID includes manual operation feature, and diagnostic “stuck-controller” timer feature for alarm
output of control problems.
Digital communication option for Profibus-DP and Modbus-RTU. Ethernet-IP is pending.
Two analog outputs may be configured to track ClO
2
and temperature, ClO
2
and ClO
2
, or ClO
2
and pH. Both analog outputs can be individually programmed to fail to specific values. An
optional third analog output is available, providing separate outputs for ClO
2
, pH, and
temperature.
Selectable Output Fail Alarm feature allows system diagnostic failures to be sent to external
monitoring systems.
Large, high contrast, custom LCD display with LED back light provides excellent readability in any
light conditions. The secondary line of display utilizes 5x7 dot matrix characters for clear
message display. Two of four measured parameters may be on the display simultaneously.
Diagnostic messages provide a clear description of any problem with no confusing error codes to
look up. Messages are also included for diagnosing calibration problems.
Quick and easy one-point calibration method and sensor zero-cal. To provide high accuracy, all
calibration methods include stability monitors that check temperature and main parameter stability
before accepting data.
High accuracy three-wire Pt100 temperature input. Temperature element can be user calibrated.
Security lock feature to prevent unauthorized tampering with analyzer settings. All settings can
be viewed while locked, but they cannot be changed.
