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 neutralization facilities so long as the required external drive controllers or switching and control devices are connected.
The program sequence for the neutralization 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.
PHR-8E pH Controller
Technical Data
Power supply230 VAC +5%/-10%, 50Hz
Power consumption
approx. 7 VA
Fuse protection
4 A mT
Inputs
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...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
Ambient temperature
-20 ... +55 °C
Housing
DIN switching panel housing (IP40), with see-through cover (optional) IP 54 in front of panel
Dimensions
W / H / D: 144 x 72 x 125 mm (incl. connector strip) Mounting cut-out: 126 mm
Ordering information:
PHR-8E: E1745
Accessories:
pH single-rod measuring chain: EMK-12P E1712 EMK-12PX E1715 Coaxial cable for 5m KC0019 pH measuring cell (other lengths available on request)
data sheet (german) description (german)