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PHR-8E pH Controller

The PHR-8E pH controller is used to adjust or monitor a liquid solution for a prescribed pH range. This unit is used for controlling neutralisation facilities, provided that the required external drive controllers or switching- and control-devices are connected.
The program sequence for the neutralisation or monitoring procedure is microprocessor - controlled and the user can select from among the basic functions of continuous dosing, program control, and drain control. The program control function can be switched between three-point control, pulse frequency, and pulse-width modulation.
For recording purposes, the device is equipped with a freely configurable current output and with an RS-232 printer interface. Multiple configuration and setting options enable the user to precisely adapt the unit to the given application.


pdf data sheet (german)

pdf description (german)

Technical Data

Voltage supply
230 VAC +5%/-10%, 50Hz

Power consumption
approx. 7 VA

Fuse protection
4 A mT

5 x neutral NO switch to GND
contact voltage approx. 10 VDC, I approx. 9 mA
contact resistance, max. 1.5

Electrode input
differential amplifier, Re > 5 x 1011 (per DIN 19265) asymmetrically fed to the input terminals for commercial single-rod measuring chains

Temperature sensor
PT100 in three-conductor configuration,
temperature compensation in range from 0...120°C,
temperature measurement from -50°C ... 150°C.
resolution: 0.5K (rounded internally).

Relay outputs 5 x NO contact neutral, max. 230 V AC, 2A
3 x changeover contact, neutral, max. 230 V AC, 2A

Data output
for standard RS-232 printer interface:
8-bit UART + start bit(0) + stop bit(1), 2400 Baud.

Current output
0(4) ... 20 mA max. load 400
linearity: 0.5% FS

Voltage output
0(2) ... 10 V min. 1 , linearity: 0.5% FS

Climatic Conditions
acc. to DIN EN 60204-1 ( 05-2010 )
Ambient Temperature
operation:              -20 ... +55 °C
transport/storage:  -25 ... +55 °C

control panel housing per DIN 43700 (IP40)
with transparent cover up to IP65 in front
of the control panel

W / H / D: 144 x 72 x 125 mm (incl. connector strip)
mounting cut-out: w x H 137 x 67 mm

Ordering information:
PHR-8E:      E1843

pH single-rod measuring chain:
      EMK-12P:        E1712
      EMK-12PX:      E1715
coaxial cable for pH measuring cell 5m
(other lengths available on request):      KC0019