AWE Direct

AWE Instruments

P7685-010 Dual Input pH and Redox Controller, with temperature measurement, ATC, proportional control relays and dual user selectable 4-20mA output.

Dual input pH controller and Redox Controller model P7685-010

The P7685-010 Dual Input pH and Redox Controller is available in both surface mounting and panel mounting configurations

Model Number P7685-010-W is supplied in a surface mounting enclosure.

Model Number P7685-010 is supplied in panel mounting configuration.

P7685-010 Dual input pH and Redox Controller Introduction

The P7685-010 is a dual input pH and Redox (ORP) controller and has inputs for one pH probe, one Redox probe and one Temperature sensor. With these inputs connected to the same controller, space can be saved on requiring separate process instruments. In addition a temperature sensor can be connected to the P7685-010. The temperature sensor can be used to measure temperature and be used as an automatic temperature compensation (ATC).

The P7685-010 is designed to provide reliable, accurate, dependable and repeatable measurement and control of many industrial processes.

The pH electrode input can be via a standard pH electrode or via an antimony electrode for use in applications where hydrofluoric acid is present.

The P7685-010 has a range of outputs - these include 2 x 4-20mA expandable outputs. These 4-20mA current outputs are user configurable and can be selected to give either 2 x pH outputs, or 1 x pH output and 1 x Redox mV output signal, or 1 x pH and 1 x Temperature output. 

The display on the P7685-010 dual input pH and Redox Controller is a bright 16 character alphanumeric display and displays the measured parameter (pH, Redox or Temperature) as well as the state of the control relays and alarm relays. By simply pushing the front mounted buttons information about operating condition of the pH Sensor, Redox Sensor, control, alarm and output parameter settings.

For pH measurement the P7685-010 dual input pH and Redox Controller offers a full range across the 0.00 - 14.00 pH scale, from 0 - ±1000mV on the Redox or ORP scale and - 10 to 110ºC on the temperature scale. We strongly recommend pairing the P7685-010 with an AWE Instruments pH Electrode or Redox Electrode as required, or another high quality electrode.

The versatility of the microprocessor and the user friendly software allow the programming of the dual input pH and Redox controller to be as easy as possible. The calibration of the instrument is simple allowing this to be conducted even by untrained operators. 

The P7685-010 is designed to provide reliable 

P7685-010 Dual input pH and Redox Controller with Proportional Control Relays

The P7685-010 dual input pH controller is fitted with two proportional control relays which can be programmed for either On / Off Control, PFM control for use with a proportionally controlled dosing pump, or PWM to time proportionally control solenoid valves. 

The two setpoint relays can be used for either pH or Redox. That is, both relays can be set for pH control, or one for pH control and one for Redox Control or both for Redox Control.

The proportional control relays are proportional band selectable across the output range. This means that with a compatible dosing pump such as our range of proportional control ATAM series dosing pump can be called to adjust the number of strokes or frequency of strokes that the pump makes per minute; this allows the pump to precisely control the amount of chemical dosed both decreasing the amount of chemical used and enabling the pH Controller and a correctly matched dosing pump reach a precise pH value. 

In addition to the control relays the P7685-010 dual input pH and redox controller has a single alarm relay with delay timer. This can be set to either a high or low measured value on the pH input or Redox (ORP) input. 

There is also an auto-clean relay fitted to the controller. This auto-clean relay can be used to control one of our auto-clean systems. These are systems which use a blast of compressed air to remove debris or coatings which may cover a process electrode which in this instance could be either a pH probe or Redox Probe. The P7685-010 dual input controller will freeze and hold the measured values as well as the control function for a pre-set time during this process. This is designed to ensure that the output controls and output signals do not cause a false reading to initiate a new process or give a false reading.

P7685-010 Dual input pH and Redox Controller with dual expandable 4-20mA Outputs

The P7685-010 Dual input pH controller has two expandable (0) 4-20mA outputs. These 4-20mA outputs are expandable (programmable) into 600Ω and can be used to feed directly into a programmable logic controller (PLC) or to compatible control devices such as our 4-20mA Dosing Pumps.

The (0) 4-20mA outputs can be selected so that the output signal corresponds to either 2 x pH, or 1 x Redox and 1 x pH, or 1 x pH and 1 x Temperature. In addition one of the 4-20mA outputs can be disabled should it not be required. As the 4-20mA outputs are expandable they can be programmed to represent a smaller amount of the required scale or inverted. That is with pH as an example - a 20mA current output signal could be given at a value of 10.00 pH and a value of 7.00 pH could represent 4mA. This would call for a compatible dosing pump to dose a correcting acid to bring the pH down to 7.00 should the pH exceed this value. Normally a compatible pump would be programmed to offer the maximum number of strokes per second at the 20mA value and to stop should a 4.00mA signal be received. The P7685-010 Dual input pH and Redox controller can also offer a user defined hysteresis of ±10%. 

P7685-010 pH & Redox Controller Specifications

Range pH: 0.00 - 14.00 pH.

Range Redox (ORP): 0 - ±1000mV

Display: 16 character alphanumeric LCD.

Temp Range: -10 - 110ºC or 14 - 230ºF

Automatic Temp Comp: Automatic via PT100 Sensor.

Manual Temp Comp: Manually Selectable from -10 - 110ºC 

Zero: Adjustable

Slope: Adjustable

Resolution: 0.01 pH.

Set Points: 2 on / off, high / low selectable, 5 amp non-inductive.

Action: On / Off, PFM (Pulse Frequency Modulation) or PWM (Pulse Width Modulation).

Hysteresis: ±10% adjustable.

Alarm Relay: 1

Action: Min or Max 0 - 60 mins after activation of S1 / 2.

Current Output: 2 off 0 - 20mA or 4 - 20 mA (programmable) isolated to 600 ohms.

Power supply: 230 - 115 volt at 50 / 60Hz.

Power Consumption: 5 VA

Weight: 850 grams panel mount version.

Dimensions: 96 x 96 x 155mm cutout 91.5 x 91.5mm

Ordering: Please Specify model:- P7685-010 Panel Mounting Dual Input pH Controller and P7685-010-W Surface Mounting Dual Input pH Controller

AWE Instruments P7685-010 Dual Input pH Controller Data Sheet

P7685-010 Data Sheet