Functional Specifications - B&C CL 7685 Operator's Manual

B&C Electronics CL 7685

1.1 FUNCTIONAL SPECIFICATIONS

Input
The instrument accepts input from potentiostatic sensor for Active Chlorine, Chlorine Dioxide and
D.Ozone measuring.
A second input is provided for 3 wires Pt100 Temperature sensors.
Temperature compensation
The unit is supplied with manual or automatic Temperature compensation and Temperature
information may be displayed on LCD.
The instrument detects the absence or malfunctioning of the Temperature sensor and automatically
switches to manual operation mode.
Measuring ranges
The unit provides an input range which may be selected from 0/1.999 or
0/19.99 PPM.
Auto ranging function may be activated for the measuring range 0/1.999 PPM.
Auto ranging allows the operator to calibrate the unit in the low range, against a high concentration of
standard solution.
Analog output
Either a 0/20 mA or 4/20 mA isolated output may be selected, provided for interface with computer or
data loggers.
A special routine allows selection of the analog output range.
If the instrument is programmed for high range, the output may be set anywhere from 0/20.00 PPM.
If low range is selected, the output may be set anywhere from 0/2.000 PPM.
Control relays
The monitor is equipped with two SPDT control relays.
These output relays may be used in a variety of ways, and the function of each relay is programmable
by operator.
Control relays can be used in one of 3 different output modes: on/off, pulse width modulation and
pulse frequency modulation.
The on/off mode of operation is used for simple control or for alarm purposes. Each control relay may
be programmed for set-point, high/low, hysteresis or dead band, delay time for actuation.
The proportional mode of operation is used for more accurate control.
Each control relay may be programmed for set-point, high/low, proportional band, Frequency or Width
modulation.
The full display indicates the current setting and the current status of each relay.
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Operator's Manual - Rev. C - 05/05 5