B&C Electronics PH 7685/E – Rev. B
- 5 -
Operating mode
The instrument is provided with 2 programmable modes of operation.
- Automatic operation:
The Automatic mode is the normal operation mode of the unit.
- Manual operation:
This mode of operation would normally be used for control system troubleshooting.
The unit will allow the relays to be manually actuated by pushing up/down keys.
The letter "M" flashing on the display, indicates the instrument is in manual operation mode.
Calibration mode
The instrument recognizes the buffer solutions for the automatic pH and the ORP calibration.
Manual calibration may also be performed.
Software filter
The unit is provided with a programmable software filter, to be inserted when the readout is not
stable.
Configuration
A number of programming functions are provided in the Configuration menu and are protected by
a selectable access number, which must be entered to allow changes in this setting.
Keyboard lock
The keys on the front panel of the monitor can be used for both changing the display and for
calibrations and set-point adjustments.
When the monitor is shipped, all functions are accessible.
However, the adjustment and calibration functions may be locked in order to prevent unauthorized
adjustments to the instrument.
Options
091.211 PFM - PWM proportional action.
091.3711 Dual isolated and programmable output.
Two outputs may be configured for pH(ORP) or Temperature.
091.701 RS232 isolated output.
The output sends the data (pH, mV, °C) to the serial port of the computer.
091.404 24 Vac power supply.
To Next Page
