PH 7685
pH/ORP controller
Add the following to the common Features/Specifications
of the 7685 Series shown overleaf
• Applications:
- water treatment
- food industry
- drinking water
- swimming pool
- biotechnology
• Input from:
- pH electrode (Glass or Antimony)
- ORP electrode
- Pt100 3 wires
• Temperature readout
• Calibration parameters display
• Set-point and alarm conditions display
• Automatic or manual temperature compensation
• Operating mode: automatic and manual
• 0/20 mA or 4/20 mA programmable isolated output
• Dual set-points with hysteresis, delay and min/max
programmable functions
• Min/max and set-points timing alarm relay
• Continuous/flashing alarm
• EEPROM parameters storage
• Automatic overload protection and reset
• Extractable terminal blocks
• 96X96 (1/4” DIN) housing
Specifications
Sensors type
Glass pH - Antimony pH - ORP - 080102.1 preamplifier
RTD Pt 100 3 wires
Glass electrode
Zero: 0.0 mV at pH 7 ±2 pH
Slope: 59.16 mV/pH at 25 °C 80/110 %
Antimony electrode
Zero: -325 mV at pH 7 ±2 pH
Slope: 50 mV/pH at 25 °C 70/140 %
ORP electrode
Zero adjustment: ±100 mV
Sens. adjustment: 80/110 %
Input scales
* pH: 0.00/14.00 ±0.01 pH
* ORP: -1000/+1000 mV ±1 mV
* Software filter 90%RT: 0.4/20.0 s for small/large variations
Temperature
Measuring and compensation range: -10/+110 °C
Resolution: +/- 0.1 °C
Zero adjustment: ±2 °C
Manual Temp. comp: -10.0/110.0 °C
Option 091.211
Set-point A/B selectable actions: ON/OFF - PFM – PWM
PFM action
Proportional band: 0.00/1.50 pH (0/150 mV)
Pulse frequency: 0/120 pulse/min
Function: Min/Max
PWM action
Proportional band: 0.00/1.50 pH (0/150 mV)
Pulse Period: 0/99.9 s
Function: Min/Max
Option 091.3711
Dual isolated output.
The user may select the temperature output
Option 091.4143
9/36 VDC power supply