OXYGEN CONTROLLER CO-421A
CO-421A is a stationary device used for continuous measurements of oxygen concentration in the air in % and temperature. 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 may be stored in PC memory with use of delivered software
Characteristic features:
- Meter co-operates with COG-3At sensor with built in KE-LF25 oxygen sensor made by company Maxell from Japan and a Pt-1000 temperature sensor.
- Maintenance free sensor, doesn’t require membrane nor electrolyte replacing.
- Lifetime expectancy of the oxygen sensor – 5 years in standard conditions.
- Sensor, after damage or use up, may be replaced by the user.
- May be used in atmosphere with presence of other gases, details given in the table.
- Enables 1-point calibration in the air. Calibration is done without the need of disconnecting the outputs.
- In the model with relays there are 3 options of programming the alarms (relays): 2 upper limits, 2 lower limits and 1 upper and 1 lower limit.
- Equipped with backlit LCD display.
- Powered by 12 V adapter.
- With special hanger for mounting on the wall.
- 24 months of warranty for the meter, 12 for the sensor
- High accuracy at affordable price.
On special order available meter which may collect up to 8000 data sets with chosen time interval. The available values of the interval are 1, 2, 5, 10, 15, 30 and 60 minutes.
If the memory capacity is used up the oldest result is deleted and replaced with a new one. The collected or actual results may be transferred to a PC with use of the USB connector. Delivered in the set software enables the transmission of data including measured result, measured temperature, time and date. Stored results can’t be viewed on the meter’s display, except the minimal and maximal values in given time.
TECHNICAL DATA
SENSOR’S PARAMETERS
| Parameter | Model LS-25LF | |
|---|---|---|
| Measuring range | 0 ÷ 30% | |
| Accuracy after calibration | ± 1% of full scale | |
| Work conditions | Atmospheric pressure | 811 hPa ÷ 1216 hPa |
| Temperature | 5 ÷ 40°C | |
| Relative humidity |
10 ÷ 80% RH without condensation |
|
| Response time ( T90%) | about 15 s | |
| External size of the housing | Φ = 35 mm, L = 75 mm | |
| Storing conditions | Temperature | -20°C ÷ 60°C |
| Relative humidity | 0 ÷ 100% RH | |
| Pressure | 507 ÷ 1520 hPa | |
In the environment temperature down to -10°C sensor stops working but is not freezing, below -20°C it will be damaged.
The sensor may be directly mounted to the meter’s housing, or hanged in the chosen by the user place and connected with the meter with cable of chosen length.
INFLUENCE OF DIFFERENT GASES ON THE SENSOR
| Type of the gas | Concentration | Influence on O2 measurement |
|---|---|---|
| Carbon dioxide | 100,00% | No influence |
| Hydrogen | 100 ppm | No influence |
| Hydrogen sulfide | 50,3 ppm | No influence |
| Nitric oxide | 467 ppm | No influence |
| Nitrogen dioxide | 517 ppm | +0,1 O2 |
| Sulphur dioxide | 46,6 ppm | No influence |
| Ammonia | 1,00% | No influence |
Temperature sensor: Pt-1000B platinum resistor
Accuracy in the range 0 ÷ 40°C: ±0,5° C
TECHNICAL DATA OF THE METER
| Power supply | 12 V / 100 mA power adapter |
|---|---|
| Meter's accuracy (±1 digit) | 0,1%* |
| Power consumption | 700 mW |
| Dimensions (mm) | L = 149 W = 82 H = 22 |
| Weight | 220 g |
| Relays' parameters | 2A/250VAC/30VDC |
| Memory** | 8000 data sets collected with chosen time interval |
| Isolation class | according to PN-83/T-06500 |
| Radio-electric interference | N level |
| * | Final accuracy is a sum of meter and sensor errors. |
| ** | Model with memory available on special order. |