19" rack mounted oxygen measurement at % levels


temperature controlled
zero supression
auto calibration
RS232 & 485 option

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Microprocessor based 19" rack mounting oxygen measurement.

The 19" rack mounting PMA100 and PMA100-L provide fast, accurate and reliable oxygen measurement. The microprocessor based system provides a temperature controlled environment for the sensor, housed in a 19" rack mounting unit.

Paramagnetism is significantly higher for oxygen than other common gases.  The M&C magneto-dynamic measurement cell uses this physical phenomenon to provide the most accurate and reliable measurements available.

The small (2 ml) flow cell houses a robust sensor that can have a flow rate of up to 1 l/min. The small cell design improves speed of response and the paramagnetic sensor measures oxygen concentrations with a response time of less than 3 seconds.

The analyser is able to have user selectable ranges. See details on the PMA100 and PMA100-L by selecting the "Versions" tab for the most suitable unit for your application.



Datasheet for oxygen analyser PMA100L

The PMA100-L provides user configurable ranges and outputs from 0 to 1% to 0 to 100%.

Zero suppression is provided as standard to improve oxygen purity measurements.

PMA 100


Datasheet for oxygen analyser PMA100

The PMA100 provides the same level of performance as the PMA100-L with the addition of:

  • an integral pressure sensor for pressure compensation
  • RS232  interface (optional (RS485)
  • the possibility to drive 3 external solenoids allowing automatic calibration routines






Rack or table unit

Measuring range

4 linear measuring ranges free selectable, lowest span 1 %,

basis selection 0 to 1, 0 to 10, 0 to 25, and 0 to 100 vol% O2,

Manual, automatic or remote range control and range indication is possible

External range indication

Two line 16-sign LCD display, resolution 0.01 vol.% O2, continuous O2 indication and call off

Display text

Languages: English, French or German.

O2 transducer temperature, mA-signal, measuring range, time, date, failure/alarm information (and process pressure)

Response time for 90 % FSD

< 3 seconds at 60 Nl/hr air

Accuracy after calibration

Deviation ±1 % of 2 to 100 % span, ±2 % of 1 % span


Deviation: <1 % of span

Influence of ambient temperature

No influence up to 50 °C

Influence of barometric pressure

No influence within the range 0.6 to 1.6 bar abs. with integrated pressure compensation

Influence of sample gas flow

Variation of gas flow between 0 to 60 Nl/hr air will cause a difference of < 0.1 vol.% O2

Sample gas inlet pressure

0.01 up to 0.6 bar g (PMA100 and 100L require positive pressure for adequate flow rate, no pump inside)

Sample gas outlet pressure

Recommendation: discharge freely into atmosphere, however max. 0.6 to 1.6 bar abs

Flow rate of sample gas

25 to 60 Nl/hr air

Temperature of sample gas

-10 to +50 °C, dry gas

O2 transducer temperature

Fixed at 55 °C

Ambient temperature

-10 to +50 °C

Storage temperature

-20 to +60 °C, relative humidity 0 to 90 %RH



CE marked

IP protection

IP 40 EN 60529

Electrical standard

EN 61010


Shipping weight

11 Kg



4 U H x 84 HP W x 350 mm D + approx 60 mm installation space


19 inch rack mounting with front handles, grey RAL 7032

Wetted materials

Platinum, Glass, 316Ti Stainless Steel, Epoxy resin, PTFE, PVDF, FPM



Internal power unit 230 VAC standard, 115 VAC available ± 10%, 40 to 60 Hz. 35 VA


Mains: 3-pole chassis plug, signals: 4x sub-D plug

Cable length

2 m for mains supply

Sample gas connection

1/8 " NPT internal thread, option with tube connector DN 4/6 / PVDF available

Binary inputs free configurable

Potential free, 4 x 12 to 24 VDC, max. 20 mA or internal supply voltage 12 VDC

Flow alarm

Thermo-conductive flow sensor, mounted downstream O2 measuring cell

Status alarm

For min. flow alarm, O2 transducer temperature < 50 °C, central processing unit failure, pressure sensor: LED indication and potential free contact output, NO, max. 48 VDC, 500 mA, 15 W

and mA-output indication - example 22 mA

Alarm contact

For exceed/remain measuring range truncate calibration, external alarm, alternatively oxygen level alarms: LED indication and potential free contact output, NO, max. 48 VDC, 500 mA, 15 W


Output signal

Selection: isolated 0 to 20, 2 to 20, 4 to 20, 4 to 20.5 mA for the selected range, max. load 500 Ω(i)

(interface RS232 type AK-communication protocol - bi-directional, option interface RS485 type)

Binary outputs

Drive of 3 external solenoid valves for calibration, 3 x 24 VDC, max. 400 mA (PMA 100L: 24 VDC, max. 400 mA)

All specifications subject to change