Product Details

Alpha-pH2000D Wall Mount pH/ORP Differential Controller / Transmitter



Product Features


::: Built-in non-volatile memory to ensure that calibration and other information are not erased if power supply fails.

:: Menu-driven program that simplifies set-up.

:: Automatic temperature compensation (ATC)

:: Manual temperature compensation setting without the ATC probe, with independent setting for calibration and process temperature.

:: Two galvanically isolated current outputs 0/4...20mA.

:: Two switching contacts as set-point relays.

:: 0 to 2000 seconds time delay adjustment on all relays – minimizes false alarms

:: Separately adjustable high and low set-point hysteresis (dead bands) prevent chattering of relays around the set points.

:: Three control modes: limit controller, P controller and PI controller (P/PI controller as pulse length or pulse frequency).

:: Large dual display LCD for easy reading with clear multiple annunciators, alarm status, operational and error messages.

:: Separate alarm relay that alerts user to set point limits exceeded for a certain time and if the NTC300 thermistor wires are broken or disconnected during the ATC function

:: Wash relay.

:: Hold function to freeze output current (0/4...20mA) and release control relays

:: LED indicators signal control activities to visually monitor transmitter status from a distance

:: Protection against electromagnetic interference.

:: Back lit and UV light protected LC display.




Product Specification


pH Range

-2.00 to 16.00 pH

Resolution & Accuracy

0.01 pH & ±0.01 pH

mV Range

-1000 to 1000 mV / 0 to 100% (for -100 to 100 mV)

Resolution & Accuracy

1 mV / 0.1% & ±1 mV / ±0.2%

Temperature Range

-10.0 to 110 °C (14.0 to 230.0 °F)

Resolution & Relative Accuracy

0.1 °C / °F &
±0.5 °C / ±1.0 °F

Temperature Sensor

NTC 300; 2 wire

Temperature 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 0 to 100% or
-1000 to 1000 mV


0.1 to 1 pH or 1 to 10.0% / 10 to 100 mV

Function (Switchable)

P/PI control (Pulse Length / Pulse Frequency);
Limit Control; Off

Proportional Range

10 to 500%

Integral Action Time (IAT)

0 to 999.9 minutes

Adjustable Period with Pulse Length Controller

0.5 to 20 seconds

Adjustable Period with Pulse Frequency Controller

60 to 120 pulses/min

Pickup / Dropout Delay

0 to 2000 seconds

Wash Cycle

0.1 to 200.0 hours

Wash Duration

1 to 2000 seconds

Contact Outputs, Controller

1 SPDT, 3 SPST relays

Switching Voltage / Current / Power

Max 250 VAC / Max 3A / Max 600VA

Alarm Functions

Function (Switchable)

Steady or Fleet (Pulse)

Pickup Delay

0 to 2000 seconds



UV coat, backlit 14 segments display with symbols for status information


On/Off selectable with four levels of brightness control

Electromagnetic Compliance (EMC) Specifications

Emitted Interference

According to EN 61326

Immunity to Interference

According to EN 61326

Environmental Conditions

Ambient Temperature Operating Range

0 to 40 °C

Maximum Relative Humidity

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

Power Supply


80 to 250 VAC/DC 50/60 Hz Approx. 10 VA

Main Fuse

315 mA time delay, 250 V,
Bussmann BK/GDC-315 mA

Pollution Degree


Transient Overvoltage Category


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

+12V ±0.5 V (Max 50 mA)

Hold Function Switch

To freeze output current and deactivate control relays


Max 600 W

Differential pH/ORP Input

2 pin terminal

Connection Terminal

5-pin, 8-pin, 9-pin and 13-pin terminal, detachable blocks

Mechanical Specifications

Dimensions (W x H x D)

144 x 144 x 110 mm


950g (unit) / 1100g (Packed)

Environmental Rating

IP65 (NEMA 4X)


Ordering Information


Order No.


TSPHCTP2000D Alpha pH2000 pH/ORP Differential Analyser with 4-20 mA Output and 85-250 VAC/DC (Unit Only)


Download Brochure

Alpha 2000 Series


Related Accessories

pH ORP Process Electrodes
Calibration Solutions

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