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PHR-7W pH Controller

The PHR-7W pH controller is used to adjust or monitor a liquid solution for a prescribed pH range. The unit is equipped with all the inputs and outputs necessary to independently control a neutralization system. The program controller for the neutralization process is supported by the software and is selectable. The control function can be switched between three-point and pulse frequency operation. For recording purposes, the unit is equipped with a freely configurable current output and optionally with an RS-232 printer interface. Multiple configuration and setting options enable the user to precisely adapt the unit to the given application

Technical Data

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

Power consumption
approx. 15 VA

Fuse protection
4 A mT

5 x neutral NO switch to GND
Contact potential difference 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...100°C, temperature measurement from -50°C ... 150°C. Resolution: 0.5K (rounded internally).

Relay outputs
2 x phase-positioned (neutral possible)
6 x neutral, max. 230 V AC, 2 A

Data output (optional)
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 Operating temperature -20 ... +55 °C

DIN plastic housing for wall mount - IP54

W / H / D : 243 x 193 x 116 mm

Ordering information:
PHR-7W E1745

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

pdf data sheet (german)

pdf description (german)