CP-421 is a simple and accurate stationary device used for continuous pH and temperature measurements in clean water or sewage.
The controller is available in three versions:
1. Equipped with two relays to control valves and signalisation system.
2. Equipped with 0 ÷ 20 mA or 4 ÷ 20 mA current loop.
3. Equipped with RS-232 output with a software to collect the data on a PC. Optionally, the connection may be made by USB output with use of RS-232 / USB converter (additional equipment).

Characteristic features:

Depending on working conditions, the appropriate type of pH electrode may be chosen and built-in the flow or immersible head. In case, when the distance between the electrode and the controller exceeds 10 m, it is necessary to use an additional preamplifier mounted inside the immersible head or next to the flow head.

Function pH Temperature
Range 0.00 ÷ 14.00 pH -50.0 ÷ 199.9 °C
Resolution 0.01 pH 0.1 °C
Accuracy (±1 digit) ±0.01 pH* ±0.1 °C**
Temp. compensation range -5 ÷ 110 °C -
Input impedance >1012Ω -
Relay's parameters 2A/250VAC/30VDC
Isolation class according to PN-83/T-06500
Radio electric interference N level
Power supply 12 V / 100 mA power adapter
Weight 210 g
Dimensions (mm) L = 149, W = 82, H = 22
* The accuracy of the meter only.
** The accuracy of the meter only. The total error includes the meters and probe's accuracy. In the range 0 ÷ 100 °C the acceptable error of the probe with Pt-1000B resistor: ±0.8 °C , with Pt-1000A resistor: ±0.35 °C.