pH CONTROLLER CP-421

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 two versions:
1. Equipped with two relays to control valves and signalisation system.
2. Equipped with 0 ÷ 20 mA or 4 ÷ 20 mA current loop.

Characteristic features:

Meter is equipped with backlit LCD display.
The device has an automatic temperature compensation system.
Controller enables 3-point calibration of the pH electrode in buffer solutions of values: 4.00, 7.00 9.00 pH or (optionally 4.00, 7.00, 10.00 pH).
Autimatic detection of the buffers' values.
Internal data-logger (8000 data sets) for data collecting and transfer to a PC.
It is possible to calibrate it without the need of disconnecting the outputs.
Powered by 12 V adapter.
Equipped with a hanger for mounting on a wall.
24 months of warranty.
Quick warranty and after-warranty repair service.

The meter enables storing of 8000 results. The built-in memory allows you to remember the results with a set time interval: the shortest 1 minute, and the next possibilities : 2, 5, 10, 15, 30, 60 minutes. When the memory is full, the oldest result is deleted and a new one is added. The results can be transferred to a computer via USB. The delivered in the set computer software allows to transfer the results of the measured function and temperature with the date and time of recording.

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.

TECHNICAL DATA

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	-
Memory	8000 data sets collected with chosen time interval
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.