PST NT-UM-2110 Microx Carbon Monoxide Analyzer User Manual

PST NT-UM-2110 Microx Carbon Monoxide Analyzer

Revision History

Before using your Microx

This user manual applies to Microx DIN rail, panel, and wall-mounted carbon monoxide (CO) analyzers with a serial number in this format: 2XXXXX, with version V.2.4.4 firmware. For Microx models with a different serial number format, please contact us at ie.ntron.sales@processsensing.com for user documentation.

Safety information

Please read this manual, ensuring that you fully understand the content before attempting to install, maintain, or use the Microx. Important safety information is highlighted throughout this document as follows:

• The warning symbol indicates instructions that must be followed to avoid minor, serious, or even fatal injury to personnel.
• The caution symbol indicates instructions that must be followed to avoid damage to equipment (hardware and/or software) or the occurrence of a system failure

NOTE : Highlights an essential operating procedure, condition, or statement.

Introduction

Overview

The Microx Module has been designed to allow Original Equipment Manufacturers (OEM) to use the module within their own equipment. This carbon monoxide analyzer is based on the common Microx module platform, hence the menu system is common throughout the Microx range. Some menu features are not relevant to the carbon monoxide analyzer and such ones are noted in this manual by the wording ‘Not applicable-DO NOT USE’ in the menu index and various warnings in RED text on the relevant menu pages. In this manual, various abbreviations and terminology are used. ‘CO’ may be used to represent the wording ‘carbon monoxide’. The Microx module is otherwise referred to as the ‘Microx CO analyzer’ for the purposes of this user manual. Key design features are:

• Compact enclosure
• Simple keypad calibration facility (utilizing onboard LCD display)
• 4…20 mA current source output for the gas level indication (10-bit resolution)
• Input voltage range, 24 V DC Nominal (12…30 V DC) and 85…264 V AC (panel and wall-mount versions)
• PCB-mounted screw terminals for all connections
• RS232 output for transmission of live data to a PC.

Operation

Before power is applied to the Microx CO analyzer, ensure that all installation work is complete and verified as safe and operable. Also, ensure the sensor is correctly connected to the Microx CO analyser. When power is first applied to the Microx CO analyser an initialization procedure is performed as follows:

• All the display segments are displayed
• The software version number is displayed
• The company name is displayed
• The sensor type is displayed
• The display then shows the gas level.

The Microx CO analyzer is now operational.

Sensor Inputs

The Microx CO analyzer uses a replaceable carbon monoxide sensor in a sample gas stream. The sensor assembly includes a flow-through connection to which the sample gas is required to be presented via pipework and suitable connection fittings. A typical sample connection circuit is shown on page 11. The sensor is provided with an integral connection cable for mounting remotely from the Microx CO analyzer. (Typical cable length is 0.5 m). Connection to the Microx CO analyzer is described on pages 8-10. Use appropriate tools and cable support/landing depending on the model of the Microx CO analyzer being used. When the Microx CO analyzer is powered Off, the sensor is shorted out internally to prevent saturation. On powering up, a few moments should be allowed for the sensor to stabilize before measurements are recorded.

Technical Specifications

Sensor|
---|---
Carbon Monoxide
Model Number| OC-49
Part Number| 01-275
Measuring Range| 0…50 ppm CO
Output Resolution| +/- 0.5 ppm CO
Lower Detection Limit (LDL)| 0.5 ppm CO
Sample Flow Rate

(application dependent)

| 150…250 ml/min
Pressure Range (coefficient)| Atmospheric +/- 10 % or 0.02 % mBar
Response Time (T90)| <25 seconds [please check]
Operating Temperature Range| -20…+50 °C (-4…+122 °F)
Life Expectancy

(application dependent)

| Up to 36 months in air
Humidity| 15…90 %rh non-condensing
Calibration Interval

(application dependent)

| 6…12 months (<5% signal loss per year)
Analyzer
Electrical
Display| LCD
Output Signal| 4…20 mA
Digital Communications| RS232
Relay Output Options| Two single pole change-overs, rating 6 A, 250 V AC
Power Supply| 24 V DC nominal (12…30 V DC) all versions 85…264 V AC panel and wall-mount only
Maximum Power Consumption| 2.4 W
Mechanical
Ingress Protection| DIN rail – IP20, Panel – IP40, Wall – IP65
Housing Material| ABS
Mounting| DIN rail (M36) / panel/wall
Compliance
ETL: UL-61010-1, EMC: EN 50270, UKCA

Microx Module

Fuses

A 500 mA anti-surge fuse is fitted to the OEM module, which is connected between the power supply and the OEM module. It is located next to the power input terminals.

Mounting Options

• DIN rail mounting version.
• Overall dimensions:
• 86 mm (H) x 69 mm (W) x 58 mm (D)
• Panel mounting version.
• Overall dimensions:
• 96 mm (H) x 96 mm (W) x 83 mm (D) (including connection terminals)
• Panel cut-out dimensions 91 mm (H) x 91 mm (W)
• Wall mounting version
• Overall dimensions:
• 145 mm (H) x 110 mm (W) x 93mm (D) (including cable glands)

Field Connections

All connections to the module are provided in the form of screw terminals. The pin-outs for each Microx version are given below. (Terminals 22, 23, and 24 are not used in all the following diagrams and no connection should be made to them.)

DIN rail mounting version

CO Sensor Connections by Cable Colours

• 1= No Connection
• 2= Red
• 3= Yellow
• 4= White
• 5= Black

Panel and wall-mount versions – DC supply option

(Terminals located at the rear of the module, identified below as viewed.)

CO Sensor Connections by Cable Colours

• 1 = No Connection
• 2 = Red
• 3 = Yellow
• 4 = White
• 5 = Black

Panel and wall-mount versions – AC supply option

(Terminals located at the rear of the module, identified as below as viewed.)

CO Sensor Connections by Cable Colours

• 1 = No Connection
• 2 = Red
• 3 = Yellow
• 4 = White
• 5 = Black

Recommended Sampling System Piping

RS232 Connections

Contact Ntron for details if required.

Analog Output

The analog output provides a means of indicating to external equipment (e.g. dataloggers, remote displays) the gas levels currently being detected by the system. The output is that of a Current Source (4…20 mA), where 4 mA represents zero gas and 20 mA represents gas at the sensor FSD.

Software Features

The menu system featured within the Microx module allows all calibration and configuration activities to be performed.
NOTE : It is important that the Microx module is correctly configured for the sensor in use, prior to performing any feature available in the menu system.

The keypad has the following functionality:

Password

The Microx module uses a password system to restrict the end-user from carrying out certain changes that may compromise the use of the equipment. Contact your supplier for this information.

Menu options

Menu 1 – Calibrate Sensor

1. Press the MENU button to open the menu system.
2. Using the NEXT and PREVIOUS buttons select the menu option: E:1
3. Press ENTER.
4. Apply a known concentration of gas (applicable to sensor type) at a flow rate of between 100 to 500 ml/m. Allow time for the sensor to respond. (See diagram on page 8.)
5. Using the INC and DEC buttons set the reading to that of the calibration gas level.
6. Press ENTER to span the sensor, and ‘– – – –‘ will be displayed to confirm the sensor span has been performed.
   • NOTE : Pressing the MENU button rather than the ENTER button exits the span feature without performing the calibration. Wait until the reading is stable, if not press the ENTER button to span the sensor.
7. Press the MENU button to close the menu system.
   • NOTE : The sensor span setting will be displayed (as a percentage value) on exit while the MENU key is pressed. This value is a percentage of the initial calibration value set via “New Sensor Data” in menu E:14. See note below.
8. Turn off and disconnect the calibration gas.
   • NOTE : On each occasion that a new sensor is connected and calibrated the “New Sensor Data” should be set via the procedure in menu 14. The setting should only be carried out after the calibration and not before. This will ensure that subsequent span setting figures displayed on the exit of menu 1 will be valid.

Menu 2 – Analog Output FSD

1. Press the MENU button to open the menu system.
2. Using the NEXT and PREVIOUS buttons select the menu option: E:2
3. Press ENTER.
4. Using the INCREASE and DECREASE buttons adjust the FSD to the required level.
5. Press ENTER.
   • NOTE : Pressing the MENU button rather than the ENTER button exits the sensor FSD feature without any change.
6. 6. Press the MENU button to close the menu system.
   • NOTE: The Sensor FSD will be displayed on exit while the MENU key is pressed.

Menu 3 – Set 4 mA Output

1. Monitor the current sourced from the analog output of the OEM module using a multimeter set to read milliamps.
2. Press the MENU button to open the menu system.
3. Using the NEXT and PREVIOUS buttons select the menu option: E:3
4. Press ENTER.
5. Using the INCREASE and DECREASE buttons adjust the output to 4mA .
6. Press ENTER.
   • NOTE : Pressing the MENU button rather than the ENTER button exits the 4 mA feature without performing the calibration.
7. Press the MENU button to close the menu system.
   • NOTE: The 4 mA factor will be displayed on exit.

Menu 4 – Set 20 mA Output

1. Monitor the current sourced from the analog output of the OEM module using a multimeter set to read milliamps.
2. Press the MENU button to open the menu system.
3. Using the NEXT and PREVIOUS buttons select the menu option: E:4
4. Press ENTER.
5. Using the INCREASE and DECREASE buttons adjust the output to 20 mA.
6. Press ENTER.
7. Press the MENU button to close the menu system. NOTE: The 20 mA factor will be displayed on exit

Menu 5 – Analog Output Simulation

The Microx analog output can be tested for functionality via menu 5. This option allows the user to simulate the analog output.

1. Press the MENU button to open the menu system.
2. Using the NEXT and PREVIOUS buttons select the menu option: E:5.
3. Use the UP and DOWN buttons to increase or decrease the analog output. The value displayed on the Microx display will be equivalent to the analog output.
4. Press the MENU button to close the menu system.
   • Note: The module will return to the conditions on entry.

Menu 6 – Sensor Selection

The OEM module is supplied and configured for the sensor with which it is to be used.

Customer adjustment of this setting is not recommended. Please consult Ntron if a change of sensor type is required.

• Type:02-8

Menu 7

Customer adjustment of this setting is not permitted.

Menu 8 – Diagnostics

This feature is a view-only feature. No configuration changes are possible from within this menu.

• Press the MENU button to open the menu system.
• Using the NEXT and PREVIOUS buttons select the menu option: E:8
• Press ENTER.
• The display will alternate between the current value and diagnostic code E:8x: where x is:
  • 0 Sensor signal, A to D counts low ppm range.
  • 1 Sensor signal, A to D counts high ppm range.
  • 2 Sensor signal, A to D counts %vol range.
  • 3 Firmware version.
• The diagnostic code can be selected by pressing the UP button.
• Press MENU to return the instrument to its standard mode of operation.

Menu 9 – Restore

Customer adjustment of this setting is not permitted.

Menu 10 – Zero Offset

Customer adjustment of this setting is not permitted.

Menu 11 – PPM Sensor Gain

Customer adjustment of this setting is not recommended. The module will be factory-set prior to shipment at a value appropriate to the sensor fitted. Otherwise, changing this value may limit the performance and, in extreme cases, the instrument may no longer detect gas.

Menu 12 – % Vol Sensor Gain

This setting is not relevant to this analyzer type and as such, customer adjustment of this setting is not permitted.

Menu 13 – Sensor Damping

Customer adjustment of this setting is not permitted

Menu 14 – New Sensor Data

This option allows the initial sensor calibration data to be set. It is used to predict the remaining sensor life.

• Press MENU to open the menu system.

• Using the NEXT and PREVIOUS buttons, select the menu option: E:14

• Press ENTER. The display displays E:14

• Press ENTER to store the new data in the memory.
  Note: Pressing the MENU button rather than the ENTER button exits without any change.

• Press MENU to close the menu system.

Menu 15 – Electronics Zero

This must be done with zero gas applied to the sensor. (See specifications in section 2 of this manual)

• Press the MENU button to open the menu system.

• Using the NEXT and PREVIOUS buttons select the menu option: E:15

• Press ENTER.

• Press ENTER to zero the sensor, ‘– – – –‘will be displayed to confirm the sensor zero has been performed.
  NOTE : Pressing the MENU button rather than the ENTER button exits the zero feature without performing the calibration.

• Press the MENU button to close the menu system.

Menu 16 – Noise Rejection

Customer adjustment of this setting is not recommended. The module will be factory-set prior to shipment at a value appropriate to the sensor fitted. Otherwise, changing this value may limit the performance and, in extreme cases, the instrument may no longer detect gas.

Menu 17 – Relay

The unit is fitted with two user-configurable relays that are operated in conjunction with two alarm levels. Relay 1 is associated with alarm level 1. Relay 2 is associated with alarm level 2. The user can select if the relay is normally Energized, E’ or normally de-energized, ‘d’ when the unit is not in an alarm condition. The relay can also be set to act on rising, ‘r’, or falling ‘F’ gas levels. This option allows the user to configure the operation of the relays.

• Press MENU to open the menu system.
• Using the NEXT and PREVIOUS buttons, select the menu option: E:17
• Press ENTER. The display displays r:1
• Use the UP / DOWN keys to select the desired relay.
• The display will show the following:
  • E:r Normally energized, raising alarm
  • d:r Normally de-energized, raising alarm
  • E: F Normally energized, falling alarm
  • d: F Normally de-energized, falling alarm
• The mode of operation can be changed by pressing the UP button.
• Press ENTER to store the new data in the memory.

NOTE: Pressing the MENU button rather than the ENTER button exits without any change.

• Press MENU to close the menu system.

Menu 18 – Alarm Levels

This option allows the user to set the operation of the alarm levels. There are two alarm levels associated with two user-configurable relays. Alarm level 1 is associated with relay 1. Alarm level 2 is associated with relay 2. A third alarm level is visible to the user within this menu but is used for internal functionality regarding the sensor and should not be accessed or adjusted by the user.

• Press MENU to open the menu system.
• Using the NEXT and PREVIOUS buttons, select the menu option: E:18
• Press ENTER. The display displays A:1
• Use the UP / DOWN keys to select the desired alarm level.
• Press ENTER. The display shows the alarm level.
• Use the UP / DOWN keys to set the desired alarm level.
• Press ENTER to store the new value in the memory.
  • NOTE : Pressing the MENU button rather than the ENTER button exits without any change.
• Press MENU to close the menu system.

Menu 19 – Alarm Hysteresis

The unit has a hysteresis value associated with the alarm levels to avoid relay chattering as the unit goes in and out of alarm conditions. The hysteresis value is expressed as a percentage of the alarm set point and takes a value of between 0 and 10.

• Press MENU to open the menu system.
• Using the NEXT and PREVIOUS buttons, select the menu option: E:19
• Press ENTER. The display shows the hysteresis level.
• Use the UP / DOWN keys to set the desired level.
• Press ENTER to store the new value in the memory.

NOTE: Pressing the MENU button rather than the ENTER button exits without any change.

• Press MENU to close the menu system.

Routine Maintenance & Servicing

The Microx analyzer will provide reliable and fault-free service when given regular maintenance and calibrations.

Inspection and Maintenance

• It is advisable to periodically inspect the Microx analyzer:
  • Clean the gas detector head using a clean DAMP cloth.
  • Inspect the sensor and ensure it is sound and the sensor-housing aperture is not obstructed (where applicable).
• The maximum interval between routine inspections should be assessed by the calibrating personnel and will depend upon the environment in which the equipment is installed.

Sensor Replacement

The carbon monoxide electrochemical sensor typically has a lifespan of 36 months in air. When replacement is required, the sensing element can be removed from the flow-through housing and a replacement sensor fitted.
The sensor housing may have to be disconnected from the sampling gas circuit to perform this operation.

• Remove the M3 Socket Head Screws securing the flow-through section of the housing to the top half of the housing Unplug the sensor from the PCB that sits in the top half of the sensor housing.
• Note the position of the sensor and the contact pins during removal of the Sensor.
• Try and support the PCB when removing the sensor to prevent putting strain on the wiring connected to the PCB.
• Replacement is a reversal of the above procedure. Ensure that the positioning of the sensor is the same as when the original sensor was removed.

CONTACT INFORMATION

ProcessSensing.com

Ntron Gas Measurement Ltd. Is part of the Process Sensing Technologies Group plc. © 2024 Process Sensing Technologies Ntron Ltd. Mullaghboy Industrial Park, Navan, Co. Meath, Ireland

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