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Thermo Scientific Alpha pH 2000D
Wall Mount Differential pH/ORP Controller/Transmitter



Product Features

The Alpha pH 2000D Controller/Transmitter and combination electrode system employs differential pH measurement technology.

What’s unique about this system is the differential electrode, which uses a pH glass bulb in place of the conventional reference system, making it more resistant to contamination or fouling in harsh wastewater applications. Replaceable salt bridge and reference solution add lifespan to the electrode when junction clogs.

The result: a reliable, long-lasting and cost-saving pH measurement system for demanding environments.

:: Wide pH range of -2.00 to 16.00 pH at two-decimal accuracy
:: ORP mode measures in mV or % concentration, with independent calibration modes
:: Control and measure pH and ORP simultaneously with master-slave operation by placing
two controllers side by side
:: Wall mount, pipe mount or panel mount options. Compact design of electrode with universal 1.5” NPT mounting threads enables optimal mounting positions

The pH Differential Electrode:

:: Cost Savings, Reduced Downtime and Maintenance Costs – soiled salt bridge and buffer reference solution can easily be replaced at a fraction of the cost of a new combination electrode
:: Automatic Temperature Compensation
– built-in temperature electrode
:: Use Any Buffer Standard from 2 to 10 pH as a Reference – very useful for applications that require adjustable isopotential points
:: Built-In Electronic Amplifier provides a low impedance output from the electrode, and allows analyzers to be located up to 3000 feet away from the electrode
:: Ground Rod Minimizes Electrical Interference from motors, pumps, transformers and ground currents


General: Useful for any batch or on-line type application that requires accurate pH or ORP control.

Water Purification/Treatment: Use for batch and on-line control of incoming process water, rinse water treatment, recirculating system and waste water treatment.

Industrial: Ideal for chemical processing, food processing. aquarium, pharmaceutical, hydroponics and waste control industries.

Regulatory: Hook to recorder to document data for regulatory compliance.


Product Specification

Range -2.00 to 16.00 pH
Resolution 0.01 pH
Accuracy ±0.01 pH
Range -1000 to 1000 mV / 0 to 100 %
Resolution 1 mV / 0.1 %
Accuracy ±1 mV / ±0.2 %
Range -10.0 to 110 °C / 14.0 to 230.0 ºF
Resolution 0.1 ºC / 0.1 ºF
Accuracy ±0.5 ºC / ±1.0 ºF
Sensor NTC 300; 2 wire
Compensation Auto/manual (independent process/CAL temperature)
Set Point And Controller Functions
Set Point 1 (SP1)/
Set Point 2 (SP2)
-2.00 to 16.00 pH or -1000 to 1000 mV or
0 to 100 %
Switching pH Hysteresis 0.1 to 1 pH
Switching ORP Hysteresis 10 to 100 mV or 1 to 10.0 %
Function (Switchable) P/PI control (pulse length/pulse frequency/proportional integral); limit control; off
Adjustable Period With Pulse Length Controller 0.5 to 20 sec
Adjustable Period With Pulse Frequency Controller 60 to 120 pulse/min
Integral Action Time (IAT) 0 to 999.9 min
Pickup/Dropout Delay 0 to 2000 sec
Wash Cycle 0.1 to 200.0 hr
Wash Duration 1 to 2000 sec
Contact Outputs 1 SPDT, 3 SPST relays
Switching Voltage/ Current/Power 1/8 HP: at 125 VAC / max. 0.74 A / max. 93 VA
1/8 HP: at 250 VAC / max. 0.37 A / max. 93 VA
Alarm Functions
Function (Switchable) Steady or fleet (pulse)
Pickup Delay 0 to 2000 sec
Switching Voltage/
1/8 HP: at 125 VAC / max. 0.74 A / max. 93 VA
1/8 HP: at 250 VAC / max. 0.37 A / max. 93 VA
Electrical Data And Connections
Transmitter Function Two 0/4 to 20 mA scalable outputs for pH/ORP and temperature, galvanically isolated
CU 22 Function 22 mA current output
Isolated Output Voltage 12 V ±0.5 V (max. 50 mA)
Hold Function Switch
To freeze output current and deactivate control relays
Load Max. 600 Ohm
pH/ORP Input 2-pin terminal (Differential)
Connection Terminal 5-pin, 8-pin, 9-pin & 13-pin terminal, detachable blocks
UV coat, backlit 14 segments display with symbols for status information
Backlight On/off selectable with four levels of brightness control
Power Supply
80 to 250 VAC/DC ; 50/60 Hz ; 10 VA
Main Fuse 315 mA time delay, 250 V,
Bussmann BK/GDC-315 mA
Pollution Degree 2
Transient Overvoltage Category II
EMC Specifications
Emitted Interference According to EN 61326
Immunity To Interference According to EN 61326
Environmental Conditions
Operating Temperature Range

0 to 40 ºC

Max. Relative Humidity 80 % up to 31 ºC decreasing linearly to 50 %
at 40 ºC
Mechanical Specifications
Dimensions (WxHxD) 144 x 144 x 110 mm
Weight 950 g (unit) / 1100 g (packed)
Ingress Protection IP66 (NEMA 4X)

Order Information

Order No.

TSPHCTP2000D Alpha pH 2000 wall-mount pH/ORP differential controller/transmitter. Incl. terminal blocks, cable glands, gasket etc

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