M&C TechGroup PMA 30A-D Datasheet

Embracing Challenge

Oxygen Analyser Series PMA®

PMA 30A/D

Special Features

SIL approval according to DIN EN 61508

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Thermostated, in compact 19”-cassette

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Accurate and reliable, small space

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requirement

Analogue / Digital indicator, linear

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measuring ranges

Physical measuring principle

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Small stagnant volume, fast response

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time

Remote range control and indication

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Flow alarm sensor behind the measur-

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ing cell

Status alarm, safety in operation

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Thermostated version PMA 30/D, PMA 30A/D
in compact 19”-cassette

Application

Due to the extremely fast response time
of the patented M&C magneto-dynam­ic measuring cell with no stagnant vol­ume as well as the negligible cross sensi­tivity from other sample gas components,
the portable M&C oxygen analyser PMA 30
has a wide variety of applications.

The analyser is a suitable and reliable instru­ment for monitoring oxygen concentrations
in various gas analytical control applications
including flue gas-, inert gas-, fermentation
processes- and process or laboratory control
measurements.

Description

The M&C oxygen analyser PMA 30 is a tem­perature controlled instrument which has
been designed for continuous measurements
of oxygen concentrations in particle-free and
dry sample gas.

The PMA 30 is a reliable and easy-to-operate
instrument. It is built into a compact 19
inch cassette. The transducer unit maintains
a constant operating temperature of 50 °C
and a flashing LED on the control panel indi­cates the proper operating temperature of
the analyser. The five measuring ranges are
displayed on the analogue meter with 30/
100% scale. The PMA 30A/D has a combined
analogue/digital meter and the PMA 30/D
has only a digital meter. Two output signals
are available. Sample gas connections as well
as connectors for incoming power supply,
output signals, remote ranging, remote range
indication and status contact are located at
the rear panel of the analyser. The sample
gas enters the analyser via an external pro­tective fine-filter. The required flow rate can
be adjusted at the flowmeter with needle
valve, mounted on the front panel upstream
the M&C measuring cell and the flow alarm
sensor. The internal tubing is made of PTFE
and PVDF.

Measuring principle of M&C ox­ygen analyser

The PMA 30 utilises the paramagnetic prin­ciple of operation to measure oxygen con­centrations. The analyser measures the para­magnetic susceptibility of the oxygen in the
sample gas by means of the M&C magneto­dynamic measuring cell. The physical prop­ertys which distinguishes oxygen from other
gases is its paramagnetism. It is significantly
higher comparing to other common gases.
This operation principle is one of the most
accurate and reliable procedures to deter­mine the oxygen concentration in a gas mix­ture from 0 to 100 Vol.%.

The robust M&C cross-flow cell has no
stagnant volume. Advantages are the fast
response time, the flow rate up to 60 l/hr,
the small volume of 2 ml, the extremely low
drift, the absolute linearity and the negligible
cross sensitivity against other sample gas
components. With a proper sample condi­tioning and pressure, the M&C cell will never
need replacing. The dumbbell with a small
mirror at its centre is mounted in a strong
inhomogenous magnetic field. The paramag­netic oxygen strengthens the forces on the
diamagnetic dumbbell and causes a shift­ing which is detected by a system consist­ing of light beam, mirror and a photo cell.
A compensation current is induced via the
feedback coil on the dumbbell and leads to
a reset of the dumbbell into its zero-position.

The required current is linearly proportional to
the oxygen concentration.

SIL

DIN EN 61508

Technical specications and illustrations are without
obligation, subject to modications. 05.97/11.12

M&C TechGroup Germany GmbH • Rehhecke 79 • 40885 Ratingen • Germany
[e-mail] • www.mc-techgroup.com • Fon [phone] • Fax [phone]

13.4

Gas flow diagram PMA 30

1. External fine filter

2. Flowmeter with needle valve

3. Oxygen measuring cell PMA

4. Flow alarm sensor

Dimensions

1 2

3

4

FLA

3HE (129)

Dimensions in mm

0

0

Zero

Front view

28TE (142)

20

10

5

O -Analyser

2

PMA30

100

Ext.

Side view

230

32

60

40

30

80

15

VOL.% O

10

100

20

25

30

2

Status
Heater

Span

3

1

28

2

13.4

M&C TechGroup Germany GmbH • Rehhecke 79 • 40885 Ratingen • Germany
[e-mail] • www.mc-techgroup.com • Fon [phone] • Fax [phone]

Technical specications and illustrations are without
obligation, subject to modications. 05.97/11.12

Technical Data

Version PMA 30 thermostated oxygen analyser in compact 19-inch cassette

Part No. PMA 30/D: 03A2005 = 230V 50Hz, 03A2005a = 115V 60Hz

PMA 30A/D: 03A2001 = 230V 50Hz, 03A2005a = 115V 60Hz

Measuring ranges selectable for 0-1, 0-3, 0-10, 0-30 und 0-100 Vol.% O2, linear

Expanded measuring ranges***

External measuring range indication potential free contacts for each selected range, contact rating max. 48V DC, 0,5A

Remote range control Remote range control for all 5 ranges by means of external potential free contacts

Indication

Output signals 0-10V DC non-isolated, load > 100 KΩ, for the range of 100 vol.%, and

Response time for 90% FSD < 3 seconds at 60 Nl/hr air

Accuracy after calibration deviation:

Reproducibility deviation: analogue = < 1% of span / digital = ± 0,1 vol.% O

Influence of ambient temperature no influence up to 45 °C

Influence of barometric pressure the oxygen reading varies in direct proportion to changes of the barometric pressure

Influence of sample gas flow variation in gas flow between 0-60 Nl/hr air will cause a difference of < 0,1 vol.% O

Sample gas inlet pressure 0,01 up to 1 bar g, (PMA 30 required admission pressure for competent flow rate, no pump inside)

Sample gas outlet pressure outlet of analyser must discharge freely into atmosphere;

Flow rate of sample gas max. 60 Nl/hr air, adjustable with needle valve on the flowmeter 7-70 Nl/hr

Temperature of sample gas -10 °C up to +40 °C dry gas

O2-transducer temperature fixed at +50 °C

Ambient temperature -10 °C up to +45°C

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

Power supply internal power unit for 230VAC standard or 115VAC available (a)* +/-15%, 40-60Hz, 35,5VA

Electrical connections mains supply: 3-pole chassis plug with 2 m of cable; signals: 9 and 25-pole plugs

Materials in contact with sample gas Platinum, Glass, PTFE, PVDF, Stainless Steel 316Ti, FPM, Epoxy resin

Sample gas connections 1/8" NPT i, optional hose connector DN 4/6 available

Flow alarm thermo-conductive flow sensor downstream mounted after measuring cell

Status alarm for low sample flow, transducer temperature < 40 °C, light beam defect, power failure:

Protection / electrical standard IP 20 EN 60529 / EN 61010

Housing / front colour 3U/28HP - 19-inch cassette European standard / silver

Dimension / weight height 3U, width 28HP, length 230 mm + approx. 60 mm installation space / approx. 2,5 kg

Options

03A9150 Wall mountage housing out of aluminium type 30-19 with 19“-insertion system (3U/42TE), incl. clamp box, clamp

option: zero suppression for spreading of measuring range, adjusted by the standard
ranges, for example 20-21% (1%), 18-21% (3%), 90-100% (10%), max.97-100%, incl. process pressure compensation
type SDPD** Part No.: 03A9535

PMA 30A/D: analogue meter with a scale of 0-30 and 0-100% for each selected range,
digital meter, 4
PMA 30/D: digital meter 4

1

/

digit 9 mm high LCD-indicator for 0-100% O2 reading, selectivity 0,1vol.% O

2

1

/

digit 18 mm high LCD for 0-100% O2 reading, selectivity 0,1 vol.% O

2

2

2

0-20mA* or 4-20mA* for the chosen range, non-isolated, max. load 300Ω / 900Ω

analogue signal output = ±1% of span at range 3-100% / digital indicator = ±0,1 vol.% O

2

= ±2% of span at range 1%

2

2

option: process pressure compensation PD** in a range of 0,4 to 1,6 bar absolut Part No.: 03A9530

LED indication and potential free change over contact, contact rating max. 48V DC, 0,5A (2x)

boards and filter, with window. protection class: IP65.

* Please specify with order.
** Without SIL-certication
*** Standard with analogue and digital meter.

W A R N I N G ! I M P O R T A N T !

An external fine filter must always be used at the gas inlet of the analyser. Depending
on the composition of the sample gas, it may be necessary to use a sample conditio­ning system. Without precautions, the analyser is only suitable for measuring of non­hazardous gases or gasmixtures in non-hazardous areas.

Technical specications and illustrations are without
obligation, subject to modications. 05.97/11.12

M&C TechGroup Germany GmbH • Rehhecke 79 • 40885 Ratingen • Germany
[e-mail] • www.mc-techgroup.com • Fon [phone] • Fax [phone]

13.4