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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

P7685 pH controller for proportional dosing, pH correction and control. With 2 x PFM, PWM or On / Off Control Relays and expandable 4-20mA output.

p7685

The P7685 pH controller for proportional dosing is available in either panel mounting or surface mounting configuration.

Model number P7685-W is supplied in a surface mounting enclosure

Model number P7685 pH controller is supplied in panel mounting configuration.

P7685 pH Controller For Proportional Dosing Introduction

The P7685 pH controller is designed to provide reliable, accurate, repeatable and dependable measurement and control of many industrial process. For those applications where precise control is required our model P7685 pH controller is the ideal partner featuring two proportional outputs, an expandable 4-20mA output and an alarm relay with delay timer.

With a 16 character alphanumeric LCD that displays the measured parameter and provides information about the state of the control and alarm relays. Also accessible is an indication of the operating condition of the sensor.

The versatility of the microprocessor accompanied by the user-friendly software allows the programming of the functions, routine checks and calibration to easily be accomplished even by untrained operators.

The model P7685 pH controller is a microprocessor panel mounting pH / mV & Temperature instrument. The controller is designed for control panel mounting in a 92 x 92 mm din standard cutout and is also available as surface mounting instrument. The unit operates from a power supply of either 110 VAC or 230 VAC 50/60Hz.

The model P7685 pH controller is able to measure and proportionally control pH or Redox (ORP) millivolt. The measuring discipline is user selectable and the pH input is also selectable for either Glass pH Probes or Antimony pH Probes.

The temperature input provides both a selectable temperature indication and auto temperature compensation of the pH range.

The P7685 controller is able to measure pH across the 0.00 - 14.00 pH scale, ±1000mV on the Redox (ORP) millivolt scale and from -10ºC - +110ºC on the temperature scale. The temperature measurement and Automatic Temperature Compensation are through the use of either a Pt100 temperature sensor. These are available from AWE Direct as either a pH Electrode with a built in Temperature Sensor, or as a separate stand alone temperature sensor.

When measuring pH we suggest pairing our instrumentation with an AWE pH electrode or another good quality electrode. For Redox measurement we recommend pairing the P7685 with an AWE Platinum band Redox Probe or another precision Redox probe. We also have a Antimony pH Probes for use with applications where Hydrofluoric Acid may be present. 

Proportional Control Relays, PFM, PWM, or On / Off Control and Alarm Relay.

The model P7685 pH controller features two control relays which can be programmed for either On/Off control, PFM control to proportionally control electronic metering pumps or PWM to time proportionally control solenoid valves or small pumps.

The P7685 is also fitted with an adjustable alarm relay with delay timer. This can operate on both a high and low measured value.

The P7685 proportional control relays offer PFM (pulse frequency modulation) output for proportional control of our electronic dosing pumps. The P7685 has adjustable set points and proportional band selectable for either one acid and one alkali-dosing pump.

In this instance the pH value of the measured solution can be efficiently corrected using either an acid dosing pump and an alkali dosing pump. For a pH value below the desired setpoint (e.g. a measured value of 6.00pH requiring correcting to a value of 7.00pH) the P7685 controller would call for the alkali metering pump to dose. When correcting from a value of 8.00pH to 7.00pH the P7685 controller would call for the acid dosing pump to dose.

The PFM output signal from the P7685 will mean that the a compatible dosing pump such as our ATAM series will automatically vary the frequency or number of strokes the pump makes per minute. As the pH scale is logarithmic the amount of chemical required to correct from a pH of 5.00 to 7.00 is ten times greater than the amount of chemical required to correct from 6.00 to 7.00 pH.

Using a proportional control pH controller like the P7685 means that when correcting from 5.00pH to 7.00pH the controller will call for the pump to dose at a much higher rate when initially correcting from 5.00 pH and as the measured value reaches 7.00 pH the controller will call for the pump to dose a small amount or less frequently to ensure that the required pH value is both reached precisely and the amount of correcting chemical being dosed is delivered as efficiently as possible. 

The P7685 pH controller for proportional dosing is also able to be setup for a duty and assist type installation. This is particularly useful in a number of applications specifically when a certain pH value has to be reached quickly or held during process control. For instance if a pH value of 2.00 pH has to be maintained during a process - the P7685 can operate two different pumps both dosing a strong acid. Normally one of these would be a dosing pump with a large output and the second being a small dosing pump. The larger of the pumps can be proportionally controlled to bring the pH down to a level close to 2.00 pH (approximately 2.50pH), then a second pump could be called to trim the pH to the desired level of 2.00 pH. Depending on the process and whether the pH value rises during the process - either the smaller pump or larger can be called to efficiently maintain the required pH value. (2.00 pH in this example.)  

pH controller with expandable 4-20mA for proportional control

The P7685 pH Controller 4-20mA proportional output is an industry standard current output signal which can be used with a number of compatible devices including PLC's, Data-loggers, and other associated items.

The P7685 pH Controller with an expandable 4-20mA output signal, means that the 4-20mA output can either represent the full 0 - 14.00 pH scale or a proportion of the range. So for instance the 4-20mA can be set over the 7.00 to 10.00 pH range where a 4mA is produced at 7.00 pH and a 20mA signal is produced at the 10.00 pH value. 

By incorporating an expandable 4-20mA signal the pH controller can work with an input device such as a dosing pump or another piece of control equipment. This could be used to proportionally control the pH value by either increasing the frequency or number of strokes the pump makes per minute to allow for precise control and efficient use of chemical.  

The isolated output corresponds to the measuring range selected which will expand in units of 1pH and can be programmed for either 0 - 20 mA or 4 - 20 mA.

The P7685 pH controller for proportional dosing in either panel mounting or surface mounting configuration with two control points on/off, PFM for proportional control of dosing pumps or PWM for proportional control solenoid valves, alarm relay with delay timer and isolated and expandable 0 (4) -20 mA current output has the electronics housed into an anodised aluminium case providing excellent EMC properties, and the rear of the case is fitted with two plug in connector blocks for ease of installation and maintenance.

P7685 pH Controller Specifications 

Input: Any AWE combination electrode or other good quality electrode.

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 0 - 100ºC 

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: Expandable 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 Panel Mounting pH Controller and P7685-W Surface Mounting pH Controller

P7685 pH Controller Data Sheet

P7685 Data Sheet

p3630

P3630 and P3630-W pH Transmitter

For Din Rail or Surface Mounting 

p3630-w-ph-transmitter

The P3630-W pH transmitter is supplied in an optional surface mounting weatherproof enclosure for mounting close to the pH electrode system.

The P3630 pH Transmitter is supplied as a din rail mounting option for installing into your panel or process.

By mounting the pH transmitter close to the sensor it is possible to send an industry standard isolated 4 - 20 mA signal up to 1000 metres away. The P3630-W pH transmitter operates from a 24 Volt DC (VDC) supply and the same two wires used to power the transmitter also carry the 4 - 20mA current signal.

By using the same 2 wires to carry the 4-20mA signal and the 24 Volt DC supply. The pH transmitter can be powered by the receiving Controller, Recorder, PLC or AWE Instruments model BC7635 digital indicator controller with built in stabilised power supply and high - low alarms. The amount of wiring to connect the transmitter and receiver is minimised and the majority of receiving instruments including AWE Instruments Model:- BC7635 are initially designed to receive the signal and power the external instrument.

The P3630-W pH transmitter features automatic temperature compensation (ATC) over the range of 0 - 100ºC with an industry standard Pt100 sensor, which maybe either mounted inside the electrode or supplied as a separate stainless steel sensor depending on the electrode type selected. 

 

P3630-W pH Transmitter Specifications


Range pH: 0.00 - 14.00 pH.

Temp display: 10 - 120ºC

Display: 3 ½ L.C.D. units.

Display size: 12.5 mm.

Output: 4 - 20 mA limited to 25 mA.

Galvanic isolation: 500 volts.

Temp comp: Automatic via pt. 100 sensor.

Zero: ± 15%

Span: 86 - 112%

Resolution: 0.01 pH.

Repeatability with sensor: ± 0.02 pH.

Power supply: 10 - 30 volts DC. stabilised.

Weight: 200 Grams DIN rail version.

Ordering: Please Specify model:- P3630 for Din Rail Mounting and P3630-W for surface mounting.

The accuracy of the pH measurement is to 0.01 pH and has an excellent repeatability factor making this an excellent precision instrument for industry and laboratory usage. Applications include remote effluent discharge pH monitoring, any other pH monitoring points where long co-ax cable runs are installed between the sensor and instrument. pH control with varying temperature requiring automatic temperature compensation and control loops using computers or PLC’s. Requiring 4 - 20 mA isolated signals.

The model P3630-W surface mounted pH transmitter is fitted with an external makalon door providing access to the buffer and slope controls for easy on site calibration.

P3630-W Data Sheet

P3630-W Data Sheet

PC18-K Portable pH and Conductivity Meter with ATC, pH electrode, Conductivity Cell and Temperature Sensor.

Portable pH and Conductivity Meter PC18-K

The PC18-K Portable pH and Conductivity Meter is a combination meter kit comprises of a calculator sized pH, Conductivity and Temperature meter with digital display, BNC connector, ATC (Automatic Temperature Compensation), and carrying case. The PC18-K portable pH and conductivity meter is supplied complete with pH electrode, conductivity sensor, and stainless steel temperature sensor. The stainless steel temperature sensor can be used for direct temperature measurement or as an ATC for use during the pH measurement. 

The ATC for conductivity measurement is from a temperature sensor built into the conductivity cell.

Each measure is shown individually on the digital display.

PC18-K :- Portable Multiparameter pH, Conductivity and Temperature Measurement

The PC18-K is a multiparameter meter which is able to measure the pH, Conductivity and Temperature of a solution all in the same instrument. The PC18-K is also able to compensate for each value against temperature.

The range of each measure is as follows: 

pH measuring range: 0.00 to 14.00 pH,

pH Resolution: 0.01pH

Conductivity Measuring Range (Selectable): 0 – 200.0 µS, 0 – 2000 µS or 0 – 20.00 mS.

Conductivity Resolution: 0.1µS

Conductivity Auto Temp Comp (ATC): Auto 2% per ºC at a base of 25ºC

Temperature measuring range: -50.0ºC to 150ºC

Temperature Resolution: 0.1ºC

The ATC operates between 0ºC and 100ºC

The PH15-K is accurate to ±0.02pH, ±1.5% of conductivity value at full scale, or 0.5ºC

 

PC18-K :- Portable pH and Conductivity Meter Is Supplied With:

A 9015-3B plastic bodied combination pH electrode with a 3’ connecting cable and a BNC connector.

For temperature readout and auto temperature compensation on the pH range portable pH and conductivity meter kit is supplied complete with part number A8000 stainless steel temperature sensor.

For conductivity measurements with the PC18-K Portable pH and Conductivity meter kit is supplied with part number A1003 (K=1) which is a special compact black epoxy conductivity cell with graphite electrodes and its own auto temperature sensor which provides ATC back to a base of 25oC at 2% per ºC. The Conductivity Cell has a K Value of 1.0 which is suitable for most applications.

 

The Portable pH and Conductivity meter kit has many uses which include testing of boiler and cooling waters, demin and distilled water conductivity checking, and plating shop rinse water testing to help reduce water usage along with much other industrial water treatment applications.

PC18-K Portable pH and Conductivity meter is selectable for pH, Conductivity and Temperature.  Ranges pH 0 - 14.00, temperature -50 to +150oC. and conductivity 0 - 200 µS, 0 - 2000 µS or 0 - 20.00 mS. with auto temp comp to a base of 25oC at 2% / oC
Supplied with 9005 - 3B epoxy bodied pH electrode, conductivity cell A1003 k = 1.0 with ATC, and A8000 stainless steel temperature sensor.

PC18-K Data Sheet

PC18-K Data Sheet

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AWE Direct News:- New Teflon Junction pH Electrodes and Redox Electrodes

We are now able to supply our P8000-10B series high performance combination pH electrodes with a porous teflon liquid junction, and our R8000-10B series of high performance combination redox electrodes with a porous liquid junction.

The new range of P8000 pH Electrodes and R8000 Redox Electrodes are ideal for solutions which are incompatible with ceramic. Some chemical blends involving strong acids or strong alkali solutions can slowly dissolve the ceramic junction. Other substances can block the ceramic junction such as biological effluents which contain fats, oils or greases. 

The P8000-10B porous teflon liquid junction pH electrodes and R8000-10B high performance liquid teflon junction redox electrodes aim to eliminate these concerns. 

More about our P8000-10B High Performance pH Electrodes and R8000-10B High Performance Redox Electrodes