B&C Electronics PH 7685/E – Rev. B
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2 SPECIFICATIONS
2.1 FUNCTIONAL SPECIFICATIONS
Input
The instrument accepts input from a glass or Antimony pH electrode or ORP electrode.
A second input is provided for 3 wires Pt100 Temperature sensors.
Microtrasmitter input
The instrument is provided with an input for amplified probes with 080102 microtransmitter.
Temperature compensation
The unit is supplied with manual or automatic Temperature compensation and Temperature
information may be displayed on the LCD.
The instrument detects of the absence or malfunctioning of the Temperature sensor and
automatically switches to manual compensation.
Analog output
Either a 0/20 mA or 4/20 mA isolated output may be selected, for use as an interface with
computers or data loggers.
The output Current may be set anywhere from 0/14.00 pH or -1000/+1000 mV.
Control relays
The monitor is equipped with two SPDT control relays.
Each control relay may be programmed for set-point, high/low, hysteresis or delay time actuation.
The full display indicates the current settings and current status of each relay.
Alarm relay
The unit contains a third SPDT relay designated as an alarm relay.
This relay may be used to warn of conditions that may indicate operational problems.
The relay will activate on either high/low value conditions, or on failure of the control relays to
maintain proper control.
In addition this relay may be programmed for either normal or fail-safe operation.
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