CL 7685 Potentiostatic Free Chlorine Controller - Van London

The CL 7685 is a Potentiostatic controller for Free Chlorine, Chlorine dioxide, and Dissolved ozone.

· Applications:
- drinking water
- bottling industry

· Input from:
- potentiostatic sensor
- Pt100 3 wires

· Ranges: 0/2 PPM and 0/20 PPM autoranging
· Dual filter software
· Calibration mode: immediate or postponed

· Calibration parameters display
· Dual set-point and alarm conditions display
· Automatic or manual temperature compensation

· Isolated output:
- 0/20 mA or 4/20 mA selectable
- programmable input on the span

· Automatic, manual or simulated operation
· Dual set-point
· Selectable actions
   - ON/OFF
   - PFM Pulse frequency modulation
   - PWM Pulse width modulation
   - hysteresis, delay, and min/max programmable functions

· Alarm:
   - continuous/flashing
   - min/max and delay programmable
   - on set-points timing
· Autoclean relay
   - auto + manual/manual action
   - holding function for input and outputs

· EEPROM parameters storage
· Automatic overload protection and reset
· Extractable terminal block
· 96x96 (1/4 DIN) housing

Specifications

Input Current
2 µA/PPM at 20 °C

* Scales
0/2.000 PPM - 0/20.00 PPM
(Cl₂, ClO₂, D.O₃)
Zero adjustment: +/- 0.3 µA
Cell sensitivity: 12.5/250 %
* Polarization: -200 mV (0/-1250 mV)
* Temperature coefficient: 0/4.0%/°C
* Filter software 90% RT: 0.4/20.0 s for small/large variations

Temperature
Input: Pt100 3 wires
Measuring and compensation range: -2/52°C
Resolution: 0.1 °C
Zero adjustment: +/- 1 °C

Set-point A and B
* Selectable action: ON/OFF - PFM - PWM

PFM/PWM action
Proportional band: 0/10% of the scale
Pulse frequency: 0/120 pulse/min
Pulse width: 0/99.9 s

Option 091.3711
Dual analog output
The user may select the temperature output

Option 091.4143
9/36 VDC power supply

The technical specifications may be changed without notice

Accessories

SZ 283
Potentiostatic electrode

SZ 7231
Flow cell for SZ283

SZ 7233
Flow cell for 3 sensors: SZ 283, pH, ORP

SZ 7251
Autoclean flow cell