Alpha pH 200 pH / ORP Controller / Transmitter

  • Warranty This product comes with a 1 year warranty
  • Uninterrupted Readings Symmetrical mode for clear readings even in electronically noisy environments
  • User Friendly Easy set up and calibration features for ease of use
Product Options


PH/ORP control is now supremely easy using the Alpha pH 200 limit controller, this device features 6 sub menus all controlled via a four button keypad. Set up, Calibration and password protection is all simply controlled by the user in a few simple steps.

Clear uninterrupted readings are delivered even in electronically noisy environments by using the symmetrical mode whilst the two SPDT relays with independent hysteresis produced effective high/low set points limit control with minimal relay chattering.

User friendly options of Eutechs' Alpha pH 200 are the choice of automatic or manual temperature compensation, in addition to this is the three wire system which compensates error due to cable resistance. 85 to 250 VAC. 50/60 Hz or DC variable input allows the user to set up this controller in a wide range of supply voltages and full scale 4 to 20 mA galvanically isolated current output for process control.

The Alpha pH 200 features a heightened security mode which enables the user to set two levels of password to protect against unauthorised tampering and access only to calibration and set up menus via pre set passwords.

This product is covered by a 1 year warranty.

Manufactured by: Eutech Instruments
Model: Alpha pH 200 pH / ORP Controller / Transmitter

Services offered for this product

  • Sales
  • Rental
  • Installation
  • Calibration
  • Maintenance


Ideal for virtually any batch type application where pH or ORP control or adjustment is needed. Use as ORP monitor for ozone systems and general purpose pH monitor for all types of water treatment and chemical processes.
Use for pH and ORP control in fish ponds and tanks.
Use to treat batches of incoming process water, rinse water treatment, recirculating system and wastewater treatment. Suitable for pH or ORP control of plating tanks and chemical processing tanks. Ideal for low cost monitor with alarms for batch and process applications. Perfect for wastewater neutralization in small and medium sized batches.


Range 0.00 to 14.00 pH
Resolution 0.01 pH
Accuracy ±0.01 pH
Range -999 to 1000 mV
Resolution 1 mV
Accuracy ±2 mV
Range -10 to 110 °C
Resolution 0.1 °C
Accuracy ±0.5 °C
Sensor Pt100; 2 or 3 wire
Compensation Auto/manual (0 to 100 �?????????????�????????????�???????????�??????????�?????????�????????�???????�??????�?????�????�???�??�?�ºC)
Set Point and Controller Functions
Set point 1 (SP1)/�?????????????�????????????�???????????�??????????�?????????�????????�???????�??????�?????�????�???�??�?� 
set point 2 (SP2)
0.00 to 14.00 pH or -999 to 1000 mV
Switching pH Hysteresis 0.00 to 2.00 pH
Switching ORP Hysteresis 0 to 300 mV
Function Limit control
Contact Outputs 2 SPDT relays
Switching Voltage / Current / Power Max. 250 VAC / max. 3 A / max. 600 VA
Electrical Data And Connections
Transmitter Function 4 to 20 mA scalable outputs for pH/ORP, galvanically isolated
Load 200 Ohm
pH / ORP Input BNC (1012�?????????????�????????????�???????????�??????????�?????????�????????�???????�??????�?????�????�???�??�?� impedance); asymmetrical/symmetrical
Connection Terminal 3-pin, 7-pin & 9-pin terminal, detachable blocks
LED 7 segments display
Power Supply
Input 85 to 250 VAC, 50/60 Hz
Main Fuse 250 mA, anti-surge, S504 Bussman
EMC Specifications
Emitted Interference According to EN 61326
Immunity To Interference According to EN 61326
Environmental Conditions
Operating Temperature Range -10 to 50 °C
Max. Relative Humidity 10 to 95 % (non-condensing)
Mechanical Specifications
Dimensions (WxHxD) 96 x 48 x 150 mm
Weight 300 g (unit) / 350 g (packed)
Ingress Protection IP50