Alpha pH 190 pH/ORP Controller/Transmitter

  • User Friendly Easily accessible sub menus all via push button keypad
  • Warranty This product is covered by a 1 year warranty
  • Versatile Can be used with a wide range of supply voltages
Product Options


If a faster and more convenient control is required the Alpha pH 190 is the perfect solution, this controller features 6 easily accessible sub-menus accessed via a four button keypad. Easy set-up, quick calibration with USA/NIST buffer recignition and direct access to set point adjustment is all at the touch of a button. Uninterrupted, clear readings are displayed using the symmetrical mode of operation even in electronically noisy environments. During periods of maintenance and calibration the controller freezes data transmission and relay activites for ease of use for the user.

Two SPDT relays with independent hysteresis provide effective high/low set points limit control for minimal relay chattering. Variable 85 to 250 VAC, 50/60 Hz or DC input enables the controller to be used over a wide range of supply voltages and the full-scale 4 to 20 mA galvanically isolated current output for process control.

A user friendly feature is the choice of automatic or manual temperature compensation, with three-wire system which compensates errors due to cable resistance to enhance user experience. Plus for enhanced security this controller/transmitter comes complete with two levels od password to protect against unauthorised tampering.

This product comes with a 1 year warranty.

Manufactured by: Eutech Instruments
Model: Alpha pH 190 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 oaone systems and general purpose pH monitor for all tyoes of water treatment and chemical processees.
Use for pH or 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 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 °C)
Set Point And Controller Functions
Set Point 1 (SP1) / Set Point (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