% level oxygen measurement in a hazardous area
PMA50EEX
ATEX Zone 1
SIL rated
small footprint
Oxygen measurement in a hazardous area.
The PMA50EEX provides fast, accurate and reliable oxygen measurement in a compact wall mounting system.
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 5 seconds.
The analyser is able to have 5 selectable ranges:
- 0 to 1%
- 0 to 3%
- 0 to 10%
- 0 to 30%
- and 0 to 100%
This allows this system to be used for trace level oxygen measurements as well as oxygen purity applications.
GENERAL |
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Measurement |
Oxygen |
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Configuration |
Wall mounted |
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Measuring range |
Selectable for 0 to 1, 0 to 3, 0 to 10, 0 to 30, and 0 to 100 vol% O2, linear and position external. |
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External range indication |
Externally: potential free contact for all measuring ranges. Capacity 48 VDC 200 mA DC, minimum contact rating 5 V / 1 mA; internally: LED indication |
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Remote range control |
Measuring range selectable via external potential free contacts 30 VDC 3 mA DC |
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Response time for 90 % FSD |
< 5 seconds at 60 Nl/hr air |
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Accuracy after calibration |
Deviation: analogue = ±1 % of span at range 3 to 100 % / digital = ±0.1 vol.% O2: = ±2 % of span at range 1% |
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Reproducibility |
Deviation: analogue = <1 % of span / digital = ±0.1 vol.% O2 |
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Influence of ambient temperature |
No influence up to 50 °C |
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Influence of barometric pressure |
The oxygen reading varies in direct proportion to changes of the barometric pressure. no influence from 0.5 to 1.5 bar abs. at PMA 50 EEX/P/PD 1 to 50 with process pressure compensation |
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Influence of sample gas flow |
Variation of gas flow between 0 to 60 Nl/hr air will cause a difference of < 0.2 vol.% O2 |
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Sample gas inlet pressure |
0.01 up to 1 bar g, or in case of purging up to 0.5 bar g (PMA 50 EEX required admission pressure for competent flow rate, no pump inside) |
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Sample gas outlet pressure |
Outlet of analyser must discharge freely into atmosphere. or 0.6 to 1.5 bar abs. at version PMA 50 EEX/P/PD 1 to 50 with process pressure compensation |
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Flow rate of sample gas |
max. 60 Nl/hr air (no flow meter inside) |
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Temperature of sample gas |
-10 to +50 °C, dry gas |
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O2 transducer temperature |
Fixed at 55 °C |
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Ambient temperature |
-10 to +50 °C |
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Storage temperature |
-20 to +60 °C, relative humidity 0 to 90 %rh |
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Certification |
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European |
CE marked |
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IP protection |
IP 54 EN 60529 |
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ATEX |
EX II2G EEX d e IICT5 of EX II1/2G EEX d e [ia] IIC T5. KEMA 03 ATEX 2215X |
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Shipping |
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Shipping weight |
22 Kg |
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MECHANICAL |
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Dimension |
475 (535) H x 275 (355) W x 200 D mm |
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Enclosure |
Explosion-proof wall mounted housing, blue |
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Wetted materials |
Platinum, Glass, 316Ti Stainless Steel, Epoxy resin, PTFE, PVDF |
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ELECTRICAL / UTILITIES |
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Power |
Internal power unit 230 VAC standard, 115 VAC available ±10 %, 40 to 60 Hz. 8 VA option: rechargeable battery, recharged by the internal power unit. 10 hr battery capacity, 14 hr recharge time with instrument off. |
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Connections |
Terminals 2.5 mm2, 3x PG cable glands (mains supply, signals, range identification, remote ranging, status alarm) |
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Sample gas connection |
¼ " NPTi |
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Flow alarm |
Thermo-conductive flow sensor downstream mounted after measuring cell |
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Status alarm |
Change-over contact, switching capacity 250 VAC 2A AC, 48 VDC 200 mA DC minimum contact rating 50 mW for temperature < +45 °C / > +60 °C, defect light beam, measuring cell not coupled, flow alarm < 10 / > 70 Nl/h, power supply error control, mains voltage breakdown |
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Outputs |
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Output signal |
0 to 1 VDC, burden > 100 KΩ, for range 0 to 100 % isolated. 0/4 to 20 mA burden 270 Ω for every measuring range, electrically isolated; output voltage max. 15 V (ex works). Switchable max. burden 800 Ω, output voltage max 30 V. Output current limiting adjustable 20 mA to 22 mA (20.5 mA ex works) |
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Analogue/Digital indication |
Analogue: selectable for each range with a scale of 0 to 30 and 0 to 100%. Digital: 3 ½ digit 9 mm high LCD for 0 to 100 % O2 reading, selectivity 0.1 vol.% O2 |
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All specifications subject to change |
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