Product Details

Alpha pH200 1/8 DIN pH/ORP Controller / Transmitter



Product Features


:: User-Customisation through Scrolling Menu, 14-Segment LED - intuitive user interface guides user easily through setup functions

:: Symmetrical Mode Operation eliminates electronic noise problems when used with solution ground

:: Galvanically Isolated 4-20 mA Output for remote monitoring or hardcopy recording

:: Universal Power Supply Input from 85 to 250 VAC/DC allows use at multiple sites and withstands voltage fluctuations

:: Two Level Password Protection prevents un authorized tampering with settings

:: Automatic Temperature Compensation with 3-wire Pt 100 system ensures accurate readings under fluctuating temperatures

:: Adjustable Hysteresis (Dead Band) prevents rapid contact switching near set point

:: Non-Volatile Memory retains all stored parameters and calibration data even if power fails

:: Easy Installation and Wiring with detachable plug-in connectors




Product Specification


pH Range

0.00 to 14.00 pH

Resolution & Accuracy

0.01 pH & ±0.01 pH

mV Range

-999 to 1000 mV

Resolution & Accuracy

1/ ±2 mV

Temperature Range

-10 to 110 °C

Resolution & Relative Accuracy

0.1 °C & ±0.5 °C

Temperature Sensor

Pt 100 (3-wire)

Temperature Compensation

Auto / Manual (0°C to 100°C)

Set Point and Controller Functions


Limit Control

Switching pH/ORP Hysteresis

0.00 to 2.00 pH or 0 to 300 mV

Contact Outputs, Controller

2 SPDT relays

Switching Voltage/ Current/ Power

Max 250 VAC/ Max 3A/ Max 600 VA

Electrical Data and Connections

Power Requirement

85 to 260 VAC, 50/60 Hz or DC

Signal Output/ Load

4-20mA galvanically isolated / 200Ω

pH/ORP Input

BNC (1012 Ω Impedence)

Connection Terminals

3 detachable connectors (3-pin; 7-pin & 9-pin terminal blocks)

Main Fuse

250mA, Anti-surge (BUSSMAN S504 + 250mA)

Environmental Conditions

Maximum Relative Humidity

80% up to 31°C decreasing linearly to 50% at 40°C

Ambient Temp. Operating Range

-10 to 50 °C (14 °F to 122°F)

Mechanical Specifications


96 x 48 x 150 mm


300 g (boxed)


Ordering Information


Order No.



Alpha pH200 pH/ORP analyser with 4-20mA output and 85-250 VAC/DC (Unit only).


Download Brochure

Alpha 190 & 200 Series


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pH ORP Process Electrodes
Calibration Solutions

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