REDOX CONTROLLER CR-421

CR-421 is a simple and accurate stationary device used for continuous redox potential and temperature measurements in clean water or sewage.
Depending on the working conditions, flow-through or immersion heads with built-in redox electrodes can be used.
The controller is available in three versions:

equipped with two relays;
equipped with 0 ÷ 20 mA or 4 ÷ 20 mA current loop;
equipped with RS-232 output – current results can be stored on a PC using the supplied software.

High accuracy at an affordable price.
The meter is equipped with a backlit LCD.
Periodically, the sensor should be manually cleaned.
Powered by a 12 V power adapter.
Quick warranty and after-warranty repair service.

CR-421 is equipped with a hanger for mounting on a wall.
When the distance between the electrode and the controller exceeds 10 m, an additional preamplifier mounted in the immersion head or next to the flow head is necessary.

A version storing up to 8000 results at a chosen time interval is available on special order. The available intervals are 1, 2, 5, 10, 15, 30 and 60 minutes. When the memory is full, the oldest result is deleted and replaced with a new one. The results can be transferred to a PC via USB. The supplied software transfers the measured value and temperature with time and date. Stored results cannot be viewed on the meter’s display, except the minimum and maximum values over a given time.

TECHNICAL DATA

Function	Redox	Temperature
Range	±1999 mV	-50.0 ÷ 199.9 °C
Resolution	1 mV	0.1 °C
Accuracy (±1 digit)	±1 mV*	±0.1 °C**
Input impedance	>10¹²Ω	-
Relay parameters	2 A / 250 V AC / 30 V DC
Memory***	8000 data sets collected with chosen time interval
Radio 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 meter’s 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.
***	Model with memory available on special order.