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The Model 420 is a membrane covered galvanic oxygen probe with built-in two-wire 4-20 mA transmitter. The probe is connected to a DC supply and draws a current of between 4 and 20 mA corresponding to the oxygen concentration.
There are only two wires to connect, and there is no limit to cable length. The output signal is galvanically isolated from the built-in electronics and the process fluid. Interference between the Model 420 and other equipment can never occur!
The OxyGuard Model 420 can be connected directly to a wide range of equipment that can accept a 4-20 mA input, such as alarms, indicators, controllers, recorders, PLC’s, PC systems with A/D input etc.
The Model 420 can also be used to measure gaseous oxygen concentration.
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- Extremely high stability.
- Calibration very rarely needed to be done.
- No regular maintenance needs. The robust membrane is easily cleaned.
- Built-in temperature compensation.
- Dimensions = Diameter 58 mm, height = 92 mm + 22 mm cable gland. Standard cable length = 7 metres.
- Weight = Approximately 600 g including cable.
- Measurement principle = Galvanic cell, self polarizing, self temperature compensating.
- Operating conditions = – to 50 C, submersible to 50 meters.
- Loop Power Supply = Depends on loop impedance. 24 volt DC recommended. Minimum supply with 50 ohm loop impedance 12 volt DC.
- Input/Output Isolation = 1000 volt RMS input-output
- Warm-up time = Typically 1 second. Depends on actual conditions of use.
- Accuracy = Error less than +/- 2% of actual value when measuring temperature is the same as calibrating temperature (barometric pressure unchanged).