Mru OMS 420 Manuel utilisateur

OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

Inspect Shipment for Damage

Carefully inspect the entire shipment for damage in the presence of the shipper’s agent, removing packaging material if

necessary. Note any damage to packaging and/or goods on Packing List and have it signed by the shipper’s agent prior

to accepting the shipment. Submit damage claim to MRU immediately.

NOTE: Damage claims not received by MRU within 3 days of receipt of shipment will not be accepted.

Save the original box and the packing material for use if the analyzer must be shipped in the future.

The products described in this manual are subject to continuous development and improvement and it is therefore ac-

knowledged that this manual may contain errors or omissions. MRU encourages customer feedback and welcomes any

comments or suggestions relating to the product or documentation.

This manual is intended solely as a guide to the use of the product.

MRU shall not be liable for any loss or damage whatsoever arising from content errors or misinterpretation of informa-

tion’s from this manual or any mis-use resulting from the use of this manual.

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

1 Content

1Content 4

2INTRODUCTION 6

2.1 The company MRU GmbH........................................................................................................................ 6

2.2 OMS 420.................................................................................................................................................. 7

3RETURNED GOODS 7

3.1 Return of analyzer according to ElektroG................................................................................................. 7

4Safety 8

2sensor – operating theory 9

6COe sensor – operating theory 10

7System components, general information 11

7.1 Optimizing combustion .......................................................................................................................... 11

7.2 OMS420 features ................................................................................................................................... 12

7.3 Probe models ......................................................................................................................................... 13

7.3.1 Compact model OMS420 (# 61417) ........................................................................................13

7.3.2 Remote transmitter model OMS420RT (# 63467RT)................................................................. 14

7.3.3 High temperature model OMS420HT (# 63467HT) ................................................................... 15

7.4 Principle of flow guidance tube.............................................................................................................. 16

7.5 Transmitter electronics........................................................................................................................... 17

7.6 Manual calibration................................................................................................................................. 18

7.7 Recommended calibration gas ............................................................................................................... 18

8Software flow chart 19

9Operation 20

9.1 Start-up.................................................................................................................................................. 20

9.2 Warm-up................................................................................................................................................ 20

9.3 Main measuring menu ........................................................................................................................... 21

9.4 Info menu............................................................................................................................................... 21

9.5 Service menu.......................................................................................................................................... 22

9.6 Settings menu ........................................................................................................................................ 23

9.6.1 PIN code level 1........................................................................................................................ 23

9.6.2 Set analog output..................................................................................................................... 24

9.6.3 Damping................................................................................................................................... 24

9.6.4 Back-purge setup...................................................................................................................... 24

9.6.5 Interval auto-calibration ........................................................................................................... 25

9.6.6 Set calibration cylinder values .................................................................................................. 25

9.6.7 Set temperature measuring unit ............................................................................................... 25

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

9.6.8 Set gas humidity....................................................................................................................... 26

9.6.9 Solenoid test............................................................................................................................. 26

9.6.10 OMS420 settings ...................................................................................................................... 26

9.6.11 Reset to (factory) defaults ........................................................................................................ 27

9.7 Calibration ............................................................................................................................................. 28

9.7.1 OMS420HT model compact probe (# 61417)............................................................................ 29

9.7.2 OMS420RT model remote transmitter (# 63467RT).................................................................. 30

9.7.3 OMS420HT model high temperature (# 63467HT)....................................................................31

9.7.4 Pin Code level 2........................................................................................................................ 32

9.7.5 O2 cell setup (by factory only) .................................................................................................. 33

9.7.6 CO cell setup (by factory only).................................................................................................. 33

9.7.7 Adjustment O2 cell amplifier (by factory only).......................................................................... 34

9.7.8 Adjustment 4 mA – 20 mA (factory only) ................................................................................. 35

9.7.9 Calibration AIR ......................................................................................................................... 36

9.7.10 Calibration AIR & GAS.............................................................................................................. 36

9.7.11 CO correction factor.................................................................................................................. 38

9.7.12 O2 heat resistor regulation (factory only) ................................................................................. 39

9.7.13 CO heat resistor regulation (factory only)................................................................................. 39

9.7.14 History auto-calibration............................................................................................................ 40

10 Troubleshooting 40

11 Technical specifications 41

12 Appendix 42

12.1 Error codes............................................................................................................................................. 42

12.2 Modbus Slave specification.................................................................................................................... 43

12.3 Declaration of confirmity........................................................................................................................ 44

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

2.2 OMS 420

Thank you for purchasing the MRU OMS420 In-Situ oxygen and combustibles (O2 and COe monitoring probe.

•Please read this instruction manual carefully before attempting to operate the analyzer. After you have become familiar

with this manual, move on to installation, operation and maintenance of the analyzer. Incorrect use of the analyzer could

cause an accident or injury.

•Product development and improvement are dynamic goals of MRU, and specifications of this analyzer are subject to

change without prior notice.

•Modification of this analyzer is strictly prohibited unless written approval is obtained from the manufacturer. MRU will

not be responsible for any issues of any kind resulting from any modification made to the analyzer without written per-

mission.

•It is important that this manual remains in the custody of the actual operator of the analyzer.

•After reading the manual carefully, it should be stored in a safe, but accessible place.

•This instruction manual should be delivered to the end user immediately upon delivery.

NOTICE:

•It is prohibited to transfer part or all of this manual in written format without MRU written permission

•Product development and improvement are dynamic goals of MRU, and descriptions and illustrations of the analyzer

used herein are subject to change without prior notice.

Please note:

Our warranty and guarantee obligations for OMS420 do not cover the usage of the analog signal 4 - 20 mA for regula-

tion- and control-purposes.

We exclude any liability for consequential damages.

3 RETURNED GOODS

Packing regulation of 12.07.1991

If your local waste facility does not except MRU packing materials for disposal, you may return it to MRU or our local

sales representative. Packing materials returned to MRU must be returned prepaid.

3.1 Return of analyzer according to ElektroG

MRU GmbH is required to accept the return, for proper disposal, of all analyzers delivered after 13th of August 2005.

Analyzers must be returned to MRU prepaid.

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

4 Safety

•The O2probe may only be used in original, undamaged condition and in accordance with the operation manual.

•All individuals dealing with the installation, commissioning, operation and maintenance of the analyzer or probe must be

qualified to do so and must strictly observe this operation manual.

•Unauthorized modifications to any part of the analyzer or probe can create safety risks and are not permitted.

•Power other than that specified in this manual must never be provided to the probe.

•Service of transmitter electronics by non skilled personnel is not allowed.

•Do not allow condensate to come into contact with the sensors.

•Do not attempt to clean the probe with water.

•The probe shall not be used in under-stoichiometric combustion conditions, due to the possible presence of flammable

gases, eventually over the LEL (low explosion level).

•Power must always be provided to the probe, even during boiler shut-down, to prevent the formation of condensate

which can damage the sensors.

•Do not use the probe for any purpose other than that specified in this manual.

•Exposure to corrosive gases such as silicone vapor, alkaline and heavy metals, P, Pb, high SO2, etc. will shorten the life

time of the sensors.

•It is mandatory to the user to insure that all persons operating this equipment are properly trained in

its operation and fully understand the operating principals of the equipment.

•

MRU GmbH, its affiliates and agents cannot be held responsible in any way for damage or injuries re-

sulting from improper use, misuse or neglect in operating this equipment.

Caution

Probes installed inside flue ducts and stacks operate at elevated temperatures (often 1.000oF and higher) cre-

ate danger of serious skin burns to operators if proper handling precautions and extreme care are not taken.

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

5 O2sensor – operating theory

Heated zirconium oxide (ZrO2) is used as a ceramic solid electrolyte that is a good oxygen ion conductor at temperatures of ap-

proximately 1.550 oF (850 °C), generated by an internal low power (20 W) heater element. The heater element is a PTC type, self-

regulating device that does not require a thermocouple for temperature regulation. Constant sensor temperature is maintained by

controlling the heater voltage and current to fixed resistance of the heater element.

The electro-motive force (emf ) that is generated across the solid electrolyte by the presence of oxygen ions can be measured as a

sensor voltage (according to Nernst law).

This voltage is measured by micro-controller based transmitter electronics and converted into a standard 4 – 20 mA signal, lin-

earized for oxygen in the range of 0 – 25 %.

The expected lifetime of this sensor is about 5 years + under normal operating conditions, and is not dependent on fuel type, but:

CAUTION:

•If combustible gas (CO, H2, HC) in high concentrations are present in the sample gas, erroneous O2readings will re-

sult due to local combustion at the sensors’ hot surface.

•Exposure to corrosive gases (silicone vapor, alkaline and heavy metals, P, Pb, high SO2, etc.) will shorten the life of

the sensor.

•Condensation of flue gas moisture close to the sensor’s flange must be prevented.

where:

U0= offset voltage (for PO2 ref = PO2sample)

R = universal gas constant

T = zirconium temperature

F = Faraday constant

PO2ref = oxygen partial pressure reference side

PO2sample = oxygen partial pressure sample side

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

6 COe sensor – operating theory

A solid ceramic electrolyte with thin-layer technology is used to measure the combustible gases (CxHy equivalent CO2). The ce-

ramic electrolyte is a good oxygen ion conductor at temperatures of approximately 1.300 oF (700 °C) generated by an internal,

low power (10 W) self regulating heater element.

The heated electrolyte has an initial voltage (U0approximately zero mV) in the absence of combustible gases (H2, CO or CH4or

C3H8, etc). In presence of these gases, the output voltage increases (see chart below) as these gases are oxidized at the hot sur-

face of sensor

The cell voltage is measured by micro-controller based transmitter electronics and converted into a standard, linearized 4 – 20 mA

signal for combustibles equivalent carbon monoxide (COe) in the range of approximate 0 – 1000 ppm.

Since the sensor is reacting to the presence of any combustible gas, but calibrated with CO+H2, equivalent CO measurements will

be reported.

The expected lifetime of this sensor is about 5 years + under normal operating conditions, and is not dependent on fuel type, but:

CAUTION:

•Exposure to corrosive gases (silicone vapor, alkaline and heavy metals, P, Pb, high SO2, etc.)

will shorten the life of the sensor.

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

7 System components, general information

The OMS420 is used to continuously measure oxygen and combustible gas concentrations in flue and stacks of industrial boilers or

furnaces, and those measurements are used to finely tune the combustion process.

7.1 Optimizing combustion

Optimum combustion conditions are achieved by decreasing the amount of excess air in the stack gas to the point where combus-

tibles start to increase. See combustion diagram below:

The absolute value of combustibles in the stack gas of a burner depends very much on the design and construction of the

burner/boiler. Combustibles (CxHy) are lower in a well-designed system than they are one that is poorly designed.

2 x 4 … 20 mA

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OPERATING MANUAL OXYGEN MONITORING SYSTEM OMS 420

It is important to monitor the rising level of combustibles, labeled opt in the above diagram, and to trim the air/fuel ratio of the

burner to compensate for changing ambient conditions (pressure and humidity) and maintain the point of maximum heat effi-

ciency.

The diagram below illustrates the burner operating under two conditions:

Conventional operation with increased safety margin (higher O2concentration in the stack

gas).

Improved operation with optimized combustion (lowest O2concentration in the stack gas

without a corresponding increase in combustibles).

The difference between the yellow area and the brown area represents the degree of combustion optimization, which in turn

represents savings in fuel.

7.2 OMS420 features

The main features of OMS420 system are:

•Compact, reliable and rugged industrial design.

•Special reference air not required (uses ambient by natural diffusion).

•True wet gas analysis and calculation of dry oxygen level if humidity of gas is known.

•Fast response time.

•Low energy consumption for both O2and COe sensors.

•Micro-controller based electronics with backlit, graphic LCD display.

•Linearized, galvanic isolated 4 - 20 mA signal outputs for both O2and COe.

•RS485 galvanic isolated digital data transfer (Modbus protocol RTU).

•Field replaceable transmitter

•Fast, safe and easy servicing by a single technician without removing the probe from the stack

•Dust tight and water proof enclosure IP65 (NEMA 4)

•Easy operation and maintenance

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