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Tuesday, 09 19th

Last updateMon, 15 Sep 2014 5am

 

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

 

 

 

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