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Summary of Contents for mru OMS 420
- Page 1 OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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Page 2: Content
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. -
Page 3: Table Of Contents
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Content Content INTRODUCTION The company MRU GmbH........................6 OMS 420 ..............................7 RETURNED GOODS Return of analyzer according to ElektroG....................7 Safety sensor – operating theory COe sensor – operating theory System components, general information Optimizing combustion .......................... -
Page 4: Introduction
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 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 Calibration ............................. 28 9.7.1 OMS420HT model compact probe (# 61417)................29 9.7.2... -
Page 5: Oms 420
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. Return of analyzer according to ElektroG MRU GmbH is required to accept the return, for proper disposal, of all analyzers delivered after 13 of August 2005. -
Page 6: Safety
• 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. -
Page 7: Sensor - Operating Theory
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM sensor – operating theory Heated zirconium oxide (ZrO ) is used as a ceramic solid electrolyte that is a good oxygen ion conductor at temperatures of ap- proximately 1.550 F (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. -
Page 8: Coe Sensor - Operating Theory
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM COe sensor – operating theory A solid ceramic electrolyte with thin-layer technology is used to measure the combustible gases (CxHy equivalent CO ). The ce- ramic electrolyte is a good oxygen ion conductor at temperatures of approximately 1.300 F (700 °C) generated by an internal,... -
Page 9: System Components, General Information
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 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. -
Page 10: Oms420 Features
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM It is important to monitor the rising level of combustibles, labeled 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. -
Page 11: Probe Models
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Probe models There are three distinctive models of the OMS420 probe available: - The compact model OMS420, which uses the flow guidance tube principle. The probe tube can be made of stainless steel for stack gas temperatures up to 1.200 F (650 °C) or made of AISI300 steel for stack gas temperatures up to... -
Page 12: Remote Transmitter Model Oms420Rt (# 63467Rt)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 7.3.2 Remote transmitter model OMS420RT (# 63467RT) This model shall be used when radiated heat from the process (duct, stack etc) will cause rising of ambient temperature higher then 130 °F (+55 °C) Remote transmitter model components are: •... -
Page 13: High Temperature Model Oms420Ht (# 63467Ht)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 7.3.3 High temperature model OMS420HT (# 63467HT) This model shall be used at sites with clean and high temperature flue gas, less then 3.100 °F (1.700 °C) High temperature model components are: •... -
Page 14: Principle Of Flow Guidance Tube
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Principle of flow guidance tube The construction of the sampling probe is using the flow guidance principle The tube is divided in half by a metal plate welded into the middle of the tube. -
Page 15: Transmitter Electronics
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Transmitter electronics The transmitter is housed in an aluminum enclosure (IP65, NEMA4X) that contains: • Printed circuit board with u-processor (PCB “MAIN”) • Backlit, graphic display and dust proof keypad • Printed circuit board for the sensor connection (PCB “OMS”) •... -
Page 16: Manual Calibration
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Manual calibration To perform calibration of the instrument, the user can use following schematic diagram (or similar). It is required to use moistured calibration gas (see § 4.7) and two hand-ball valves to select between instrument air (zero gas) and calibration gas (span gas) supply to calibration inlet port of unit. -
Page 17: Software Flow Chart
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Software flow chart GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com... -
Page 18: Operation
160 °F it is necessary to use a flange heater (ask MRU) to prevent condensation!!! (70 °C) After power is switched on, the MRU logo and model of the unit will be displayed! Warm-up Warm-up time: minimum 30 minutes LCD will display a time count down for 30 minutes. -
Page 19: Main Measuring Menu
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Main measuring menu After warm-up, the unit will start automatically by displaying the main measurement menu. real time value with 0.01% resolution real time value with ppm resolution NOTE: If between 30 min no button is pressed during the measurement, the level will be set on "0". -
Page 20: Service Menu
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Service menu Displays actual 6 lines from a scroll up/down list with measured (A/D converter) components information. Press the “UP” or “DOWN” key and return back to main measuring menu by pressing “BACK”. -
Page 21: Settings Menu
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Settings menu This menu is protected by a user level 1 PIN code. Changing the pin code is described in following chapter. 9.6.1 PIN code level 1 Entering the factory default PIN code 1111 (user level 1), gains access to the SET main menu and the above settings. -
Page 22: Set Analog Output
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.6.2 Set analog output PREV or NEXT move cursor to values which can be changed EDIT change value by means of UP/DOWN and POS save values BACK return to main menu Factory defaults are: 20mA: O 0 –... -
Page 23: Interval Auto-Calibration
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.6.5 Interval auto-calibration This function allows setting the interval of auto calibration PREV or NEXT move cursor to values which can be changed EDIT change value by means of UP/DOWN and NEXT BACK... -
Page 24: Set Gas Humidity
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.6.8 Set gas humidity This function allows setting the value of gas humidity (if known) and selection of either wet oxygen measurement or dry oxygen calculation. NEXT move cursor to values which can be changed... -
Page 25: 9.6.11 Reset To (Factory) Defaults
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.6.11 Reset to (factory) defaults System parameters will be reset to factory defaults Function will be aborted Factory defaults Auto-calibration Back-purge 4 – 20 mA Range O 20,96 % 4 – 20 mA range CO 1.000 ppm... -
Page 26: Calibration
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Calibration The transmitter should be powered up for at least 2 … 3 hours before calibration. A test (calibration) gas cylinder is connected to the calibration gas inlet port for calibration. Adjustment can be done manually or automatically using the solenoid valves of the optional pneumatic unit PU420. -
Page 27: Oms420Ht Model Compact Probe (# 61417)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.1 OMS420HT model compact probe (# 61417) Pos. Description Electrical connector Hose connection cal gas Probe tube (stainless steel) Flange 4”ANSI 150 or DN65PN6 Probe head (transmitter) Calibration gas cylinder Pressure regulator with flow volume control GlobalTestSupply www. -
Page 28: Oms420Rt Model Remote Transmitter (# 63467Rt)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.2 OMS420RT model remote transmitter (# 63467RT) Pos. Description Hose connection back purge air Hose connection cal gas and back purge air Probe tube (stainless or Inconel steel) Flange DN65 PN6 or 4” ANSI 150... -
Page 29: Oms420Ht Model High Temperature (# 63467Ht)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.3 OMS420HT model high temperature (# 63467HT) Pos. Description Hose connection injector Hose connection cal gas and back purge air Probe tube (Inconel or ceramic) Flange 4”AINSI 150 Probe head Calibration gas cylinder... -
Page 30: Pin Code Level 2
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Only authorized persons or manufacturer’s trained technicians are authorized to perform calibration IMPORTANT: adjustments on the OMS420. 9.7.4 Pin Code level 2 Calibration with AIR (zero gas) or GAS (span gas) requires the use of level 2 pin code see chapter 9.6.1... -
Page 31: O2 Cell Setup (By Factory Only)
If there is no calibration gas available and the cell must be replaced, this function permits changing a cell without calibration. This can only be done if the cell factors have been measured at MRU and delivered together with the spare sensor. -
Page 32: Adjustment O2 Cell Amplifier (By Factory Only)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.7 Adjustment O2 cell amplifier (by factory only) PREV or NEXT move cursor EDIT change value by means of UP/DOWN and POS save values BACK return to calibration menu This procedure is required only when a new O cell is installed. -
Page 33: Adjustment 4 Ma - 20 Ma (Factory Only)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.8 Adjustment 4 mA – 20 mA (factory only) Connect precision 100 Ohm resistor (0.1% tolerance) to both analog outputs of O and CO measurements. Measure the voltage across the resistors using a precision digital multi-meter. -
Page 34: Calibration Air
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.9 Calibration AIR This menu performs the 1 point calibration with AIR (zero gas). Wait approximately 5 minutes while instrument air is being sup- plied to sensors to allow signals to stabilize. Press “CALIB” key Wait for approximately 3 seconds. - Page 35 OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Wait approximately 5 minutes while instrument air is being supplied to sensors to allow signals to stabilize. Press “CALIB” key Wait for approximately 3 seconds!. Zero gas (AIR) calibration was successful. If calibration fails, an error message will be displayed.
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Page 36: 9.7.11 Co Correction Factor
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.11 CO correction factor This function allows user to perform site calibration of combustibles measurement with a comparative selective CO measurement, using portable CO analyzer (e.g. Delta65). This will make the equivalency to CO and is recommended to be carried out at sta- ble, constant combustion process. -
Page 37: O2 Heat Resistor Regulation (Factory Only)
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.12 O2 heat resistor regulation (factory only) PREV or NEXT move cursor EDIT change value by means of UP/DOWN and POS save values BACK return to calibration menu First line: regulation point actual (O... -
Page 38: 9.7.14 History Auto-Calibration
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 9.7.14 History auto-calibration This function allows the user to see the last auto calibration values. Troubleshooting If the system detects an error, the plain text will be displayed after pressing the “Error” key in the service menu. -
Page 39: Technical Specifications
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Technical specifications Measurements Oxygen and combustibles (equivalent CO ) contained in flue gas Measurement principle Heated zirconium oxide cell for O Heated solid electrolyte cell for CO Lifetime of cells more than 5 years under normal conditions (*) -
Page 40: Appendix
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM Appendix 12.1 Error codes Configuration Error, new adjustment required Flash Error, new adjustment required Please contact your dealer (manufacturer). Unit to warm, ambient temperature too high! Heating current<0.5A, O2 sensor not o.k. Heating current<0.1A, CO sensor not o.k. -
Page 41: Modbus Slave Specification
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 12.2 Modbus Slave specification General information • supports only the binary Modbus protocol (RTU) • the slave modbus address is user definable from 1 to 49 • communication parameter are user definable as follows:... -
Page 42: Declaration Of Confirmity
OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM 12.3 Declaration of confirmity GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com... - Page 43 OMS 420 OPERATING MANUAL OXYGEN MONITORING SYSTEM GlobalTestSupply www. .com Find Quality Products Online at: sales@GlobalTestSupply.com...
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