V233P Ambient Oxygen Monitor

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Specifications

• Supply

  • Input Voltage Options: 85-264VAC. Option of 24 VDC Only.

  • 140 mA at 24VDC nominal, all relays energised, Supply current:
    20 mA drawn on current loop.

  • +30mA for integral Sounder Beacon

• Outputs

  • Analogue Output: 4-20mA analogue output (10-bit
    resolution)

• Sensor Input

  • No of Channels: Sensor 1 %Vol oxygen 0-25% 18 Months life
    approx. (Replacement Sensor Part No. 01-335)

• Relays

  • 1 or 2 (For Single pole change over, user connection) Rating 6

    Amps 250 v AC

• Fuses

  • Fuse: 500mA anti-surge on board fuse for circuit
    protection.

• Additional Features

  • Display: 4 Digit, 7 Segment Display.
  • Keypad: 4-Button Keypad

• Status Indicator

  • Two-Lamp Light Tower with Sounder
  • Red Lamp LED-Alarm (+ Sounder 80db@0.3Mtr)
  • Green Lamp LED-Normal/Ready

Product Usage Instructions

1. Initial Setup

Ensure the Gasenz is mounted securely on a wall or surface in
the desired location. Connect the power supply according to the
input voltage options provided in the specifications.

2. Power On and Initialization

Apply power to the Gasenz. The device will perform an
initialization procedure automatically. Once completed, the Gasenz
is ready for operation.

3. Sensor Calibration

The % Volume sensor of the Gasenz Monitor is factory set at 0 to
25%. To calibrate the sensor, follow the instructions provided in
the maintenance section of the user manual.

4. Monitoring Oxygen Levels

Monitor the % Oxygen volume levels displayed on the Gasenz
Monitor. The device provides visual and audible alarms when pre-set
gas measurement levels are reached.

FAQ

Q: How often should the sensor be replaced?

A: The sensor of the Gasenz Monitor should be replaced
periodically, approximately every 18 months. Refer to the
maintenance section (5.1) of the user manual for detailed
instructions on sensor replacement.

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The

Ambient Oxygen Monitor
With Electrochemical Sensor

User Instruction Manual
Document No: NT-UM-2107-EN-00

F/W Issue

V233P

Issue Date: Revision No:

05/2024 00

[Type here]

08-424

1. Introduction …………………………………………………………………………………………………….3 1.1 Gasenz …………………………………………………………………………………………………………3 1.2 Operation……………………………………………………………………………………………………..4 1.2.1 %Vol Sensor…………………………………………………………………………………………..5
2. Specification……………………………………………………………………………………………………6 2.1 Status Indicator……………………………………………………………………………………………7
3. Mounting and Dimensions ……………………………………………………………………………..8 3.1.1 Field Connections …………………………………………………………………………………..9 3.1.2 Field Connections -DC/AC Supply-Option. Fig.3 ……………………………………10 3.1.4 Mounting Locations ………………………………………………………………………………….12 3.1.5 Analogue Output………………………………………………………………………………………14
4. Software Features …………………………………………………………………………………………15 4.1 Password……………………………………………………………………………………………………15 4.2 Menu options……………………………………………………………………………………………..16 Menu Structure …………………………………………………………………………………………………..17 4.2.1 Menu 1-Calibrate Sensor………………………………………………………………………18 4.2.2 Menu 2 – Analogue output FSD…………………………………………………………….19 4.2.3 Menu 3 – Set 4 mA output …………………………………………………………………….19 4.2.4 Menu 4 – Set 20 mA output…………………………………………………………………..20 4.2.5 Menu 5 – Analogue Output Simulation ………………………………………………….20 4.2.6 Menu 6 – Factory Restore …………………………………………………………………….21 4.2.7 Menu 8 – Diagnostics……………………………………………………………….. …..22 4.2.8 Menu 14 – New sensor data………………………………………………………………….22 4.2.9 Menu 17 – Rel ay …………………………………………………………………………………..23 4.2.10 Menu 18 – Alarm levels…………………………………………………………………………24 4.2.11 Menu 19 – Alarm hysteresis ………………………………………………………………….25 4.2.12 Menu 20 ……………………………………………………………………………………………….25
5. Routine Maintenance & Servicing ………………………………………………………………..26 5.1 Routine Inspection and Maintenance ……………………………………………………………26
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1. INTRODUCTION
1.1 Gasenz
This user manual applies to Gasenz analyzers with a serial number in this format: 2XXXXX. For Gasenz models with a different serial number format, please contact us at ie.ntron.sales@processsensing.com for user documentation.
The Gasenz is a wall or surface mounting device has for the monitoring of % Oxygen volume levels in an Ambient environment.
Key design features are: · Sturdy compact enclosure · Status indication by means of a two-lamp beacon and sounder unit. · Simple keypad calibration facility (utilising onboard LCD display). · 4-20mA current source output for gas level indication (10-bit resolution). · Input voltage range, 85-264VAC. PCB mounted screw terminals for all connections. Option of 24VDC only

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1.2 Operation
When power is first applied to the Gasenz an initialisation 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 Gasenz is now operational
Note: The Gasenz Oxygen Monitor is based around the Microx series of Oxygen Analyser controllers and contains some Menu programming options which are not relevant to the Gasenz product and its mode of operation. Such menu’s and information are highlighted in this user manual as ‘Customer Access Not Permitted’ and other various warnings against adjustment of such menu options. Please observe these prohibitions to ensure correct operation of the Gasenz Oxygen Monitor. The Gasenz Oxygen Monitor is supplied factory configured and calibrated for correct operation, and apart from sensor replacement and periodic calibration, should require no further user intervention. .

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1.2.1 %Vol Sensor
A % Volume sensor is an integral part of the Gasenz Monitor. The % Volume measurement range of the Gasenz Monitor/sensor combination is factory set at O to25%, with calibration at 2O.9% 02. (Ambient). The sensor is disposable, and so requires replacement periodically. (See maintenance section 5.1 in this user manual)

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2. SPECIFICATION

Supply
Input Voltage Options:

85-264VAC. Option of 24 VDC Only.

140 mA at 24VDC nominal , all relays energised, Supply current: 20 mA drawn on current loop.
+30mA for integral Sounder Beacon

Outputs Analogue Output: 4-20mA analogue output (10-bit resolution)

Sensor Input No of Channels: Sensor

1 %Vol oxygen 0-25% 18 Months life approx. (Replacement Sensor Part No. 01-335)

Relays #1 or 2 (For Single pole change over.
user connection) Rating 6 Amps 250 v AC

Fuses

Fuse

500mA anti-surge on board fuse for circuit protection.

Additional Features Display: 4 Digit, 7 Segment Display. Keypad: 4-Button Keypad

Status Indicator Two-Lamp Light Tower with Sounder Red Lamp LED-Alarm (+ Sounder 80db@0.3Mtr) Green Lamp LED-Normal/Ready

Depending on Alarm configuration requirements. See page 6.

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2.1 Status Indicator
A Two- Lamp High Intensity LED Light Tower provides indication of Normal 0perational/Ready status or condition (Green) and Alarm condition(Red). The Alarm condition is triggered by a pre-settable gas measurement level being reached. At the same time as the Red lamp is illuminated, the Sounder also operates providing the user with both audible and visual indication of the alarm condition.
(For setting alarm levels-see page 24)
The Light Tower can be pre-wired for High and Low 02 indication or for Low 02 indication only.
Typical 0perational Settings: High 02=23% rising alarm. Low 02= 19% falling alarm.

If High and Low level alarm functionality is required then only 0ne user

interface relay is available for external connection by the user. If Low level alarm functionality only is required, then Two user interface relays remain available for the user to connect to.
Note: The Gasenz will be supplied configured with standard alarm level settings unless otherwise requested by the user. For details of standard settings and other options please see the alarm and Relay configuration section within this manual.

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3. MOUNTING AND DIMENSIONS

Fig.1 shows the overall dimensions of the Gasenz.

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3.1.1 Field Connections
All connections to the module are provided in the form of screw terminals. Access is gained by opening the Gasenz enclosure to reveal the terminal connector strips on the rear of the control module. NOTE: Confirm the Voltage supply option of the Gasenz before connecting power.(24VDC or 85-264VAC)
Take care with Mains Voltage when Connecting and operating the Monitor. The Door should always be in the Closed position when operating.
See Fig’s 3 and 4 on the following pages for user field connection wiring.
The User is to make all field connections in suitable cable to local regulation codes and taking into account the power requirements of the Gasenz as detailed in section 2 (Specification) of this manual.

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3.1.2 Field Connections DC/AC Supply-Option. Fig.3

Note: Terminals 4 & 5 are not used with Electro-Chemical sensor.

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3.1.4 Mounting Locations
The Gasenz is a fixed gas detection system and should be installed so as to provide effective monitoring of a plant area where a low Oxygen level could occur. It should be capable of giving an early warning of both the presence and location of an Oxygen deficient atmosphere.
The Alarm indication thus rendered by the Gasenz should be able to initiate the following actions as required:
D Safe Evacuation of location or Premises, D Shut Down of process or plant. D Ventilation Control. D Appropriate Fire Fighting Procedures
In general, fixed systems should be installed so that maintenance of failure of one of the monitoring units does not compromise the safety of the location or premises being monitored. Duplication of Gasenz units may therefore be appropriate to maintain an adequate safety level.
Factors to take into consideration when choosing a location to mount the Gasenz are:
D Dimensions of location to be monitored D Potential leak source D Nature of gas to be detected D Possibility of pressurized gas release/evapouration/Liquid leaks D Confined spaces D Air movements, ventilation, topography of location, temperature. D Number of personnel in location.

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The densities of gases with respect to air is given in European standard EN 617791:2000. It should be noted that high pressure gas leaks can result in a drop in gas temperature and subsequent temporary increase in gas density. In general, Gas monitors should be installed close to any potential leak source but not so close that they respond to equipment which may produce inconsequential leakage.
A well designed ventilation system should result in a number of air changes per hour and thus limit the potential for a gas build up or depleted Oxygen environment from developing.
A gas monitor, as a general rule, can cover an area of around 50M2. All applications are different and require careful consideration before determining the number and location of gas monitors. The 50M2 rule equates to approximately a radius of 5M around the gas monitor. If the gas monitor is mounted on a wall, the operational area is effectively halved. (See illustrations below)

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

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4. SOFTWARE FEATURES
The menu system featured within the Gasenz allows all calibration and configuration activities to be performed.

20.9

A

B

c

The keypad has the following functionality:

Button A B C D

Function Menu Open/Close Enter Next (Increment) Previous (Decrement)

D
Alternate Function
Numeric value of 1 Numeric value of 2 Numeric value of 3

4.1 Password

The Gasenz Analyser uses a password system to restrict the end user from carrying out certain changes that may compromise the use of the equipment. The Password feature may be Enabled or disabled. Menu access is organised in three levels, 1, 2 and 3. Each of the three menu levels allows access to specific menu options within the menu system. When a particular menu level is accessed, the user has 10 seconds to enter a
specific menu within that level otherwise the menu level is automatically exited. Once a menu is entered, the user then has a duration of 10 minutes within that menu to make adjustments. When the adjustment is made, the menu is exited to save the adjusted setting to the analyser memory. The menu structure and Password system is explained on the following pages.

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4.2 Menu options

Menu option Function

E:1

Calibrate Sensor

E:2

Analogue output FSD

E:3

Set 4 mA

E:4

Set 20 mA

E:5

Analogue Output Simulation

E:6

Factory Restore

E:8

Diagnostics

E:9*

Sensor type. (Factory Only)

E:11**

PPM Sensor Gain

E:12**

% Vol Sensor Gain

E:13**

Sensor Damping

E:14

New Sensor Data

E:15**

Electronic Zero

E:16**

Noise Rejection

E:17

Relay

E:18

Alarm Levels

E:19

Alarm Hysteresis

E:20

Password Enable/Disable

*This Menu is protected by an additional factory Password and is not for use

by the end user.

** These menus should not be accessed or changed by the user.

Note: there is no Menu 10.

To access the Menus, first press the MENU button on the Analyser keypad. The Analyser display will flash with the word PASS. Enter the Password depending on the menu access required. The numerical Passwords are to be entered by using the keypad buttons as identified on the previous page. (e.g. for numerical password 1331, press button B’ then buttonD’ twice, then button `B’ again.) Note that for access to the Level 1 menus, no password entry is required. Next, press the MENU button again and press the UP arrow button to advance through the menu levels.

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Menu Structure
MENU PASS
MENU

MENU PASS 1331

MENU PASS 12231

Level 1 Password None Menu
E:5 E:8
E:17 E:18 E:19

MENU
Level 2 Password 1331 Menu
E:3 E:4 E:5 E:8
E:17 E:18 E:19

MENU
Level l Password 12231 Menu E:1 E:2 E:3 E:4 E:5 E:6 E:8 E:9* E:11 E:12 E:13 E:14 E:15 E:16 E:17 E:18 E:19 E:20

*E:9-Password protected, Factory only; ‘Greyed out’ menus should not be accessed.

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4.2.1 Menu 1-calibrate Sensor
This can be performed in ambient atmosphere after verification that said atmosphere is @20.9% Oxygen.
· Press the MENU button to open the menu system. · Using the NEXT and PREVIOUS buttons select menu option:
E:1 · Press ENTER. · Allow time for sensor to respond/stabilise. · Using the INC and DEC buttons set the reading to that of the
calibration gas level. · Press ENTER to span the sensor, ‘- – – -‘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. · 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. Note that this value is a percentage of the initial calibration value set via “New Sensor Data” in menu E:14. See note below.
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 exit of menu 1 will be valid.

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4.2.2 Menu 2 – Analogue output FSD
· Press the MENU button to open the menu system. · Using the NEXT and PREVIOUS buttons select menu option:
E:2 · Press ENTER. · Using the INCREASE and DECREASE buttons adjust the FSD
to the required level. · Press ENTER.
Note: Pressing the MENU button rather than the ENTER button exits the sensor FSD feature without any change. · Press the MENU button to close the menu system. Note: The Sensor FSD will be displayed on exit while the MENU key is pressed.
4.2.I Menu I – Set 4 mA output
· Monitor the current sourced from the analogue output of the OEM module using a multimeter set to read milliamps.
· Press the MENU button to open the menu system. · Using the NEXT and PREVIOUS buttons select menu option:
E:I · Press ENTER. · Using the INCREASE and DECREASE buttons adjust the
output to 4mA . · Press ENTER.
Note: Pressing the MENU button rather than the ENTER button exits the 4 mA feature without performing the calibration. · Press the MENU button to close the menu system. Note: The 4 mA factor will be displayed on exit.

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4.2.4 Menu 4 – Set 20 mA output
· Monitor the current sourced from the analogue output of the OEM module using a multimeter set to read milliamps.
· Press the MENU button to open the menu system. · Using the NEXT and PREVIOUS buttons select menu option:
E:4 · Press ENTER. · Using the INCREASE and DECREASE buttons adjust the
output to 20 mA. · Press ENTER. · Press the MENU button to close the menu system.
Note: The 20 mA factor will be displayed on exit.
4.2.5 Menu 5 – Analogue Output Simulation
The Gasnz analogue output can be tested for functionality via menu 5. This option allows the user to simulate the analogue output.
· Press the MENU button to open the menu system. · Using the NEXT and PREVIOUS buttons select menu option:
E:5. · Use the UP and DOWN button to increase or decrease the
analogue output. The value displayed on the Microx display will be equivalent to the analogue output. · Press the MENU button to close the menu system. Note: The module will return to the conditions on entry.

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4.2.6 Menu 6 – Factory Restore
This option allows the user to restore the configuration data to the factory default values.
Warning A restore will overwrite all previous calibration data for the selected
sensor excluding those set at the factory.
· Press the MENU button to open the menu system. · Using the NEXT and PREVIOUS buttons select menu option:
E:6 · Press ENTER button. Hold for 5 or 6 seconds. · When – – – – is displayed, release the ENTER button.
Note: Pressing the MENU button rather than the ENTER button exits the restore feature without performing any change. · Press the MENU button to close the menu system.

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4.2.7 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 menu option:

E:8

· Press ENTER.

· The display will alternate between the current value and

diagnostic code E:8x: where x is:

O

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.

4

Analyser Serial Number. First four digits

5

Analyser Serial Number. Last four digits.

(The Analyser Serial number comprises typically of 6

numerical digits)

· The diagnostic code can be selected by pressing the UP button. · Press MENU to return the instrument to its standard mode of
operation.

4.2.8 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 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.

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4.2.9 Menu 17 – Relay

Note: Changing these settings (and those in Menu 18) will alter the operating point of the Indicator unit and Relays and as such may affect the capability of the unit to announce a dangerous Oxygen Level to the user. Be sure you understand the intended effects of your intervention into these Menus.
Relay 1 or 1 and 2 are configured and wired for operation of the Light Tower indication unit and when so used, are not available for use by the user. Relays not used to operate the Light Tower are available for user connection. Relay 3 (and Relay 2 if available) are volt free contacts, 6A @ 250VAC rated. The unit is fitted with three relays that are operated in conjunction with one of three alarm levels. Relay 1 is associated with alarm level 1. Relay 2 is associated with alarm level 2. Relay 3 is associated with alarm level 3.

The user can select if the relay is normally Energized, E’ or normally deenergised, ‘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 menu option:

E:17

· Press ENTER. The display displays r:1

· Use the UP I DOWN keys to select the desired relay.

· The display will show the following:

E:r

Normally energized, rising alarm

d:r

Normally de-energized, rising 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.

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4.2.10 Menu 18 – Alarm levels
Relay’s 1 and 2 alarm levels are factory configured for 19% Vol. 02 falling (relay 1) and 23% Vol. 02 Rising (relay 2). Relay 3 is set at 25% rising by default.
19.5% is the 0HSHA recognised US lower Alarm level for 02 depletion. Some users may wish to follow this regulatory body in the application of this and other alarm level settings.
This option allows the user to set the operation of the alarm levels. There are three alarms levels associated with 3 relays. Alarm level 1 is associated with relay 1. Alarm level 2 is associated with relay 2. Alarm level 3 is associated with relay 3.
· Press MENU to open the menu system. · Using the NEXT and PREVIOUS buttons, select menu option:
E:18 · Press ENTER. The display displays A:1 · Use the UP I DOWN keys to select the desired alarm level. · Press ENTER. The display shows the alarm level. · Use the UP I 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.

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4.2.11 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 O and 1O. Warning Note: Setting to -1 disables the Relays.
· Press MENU to open the menu system. · Using the NEXT and PREVIOUS buttons, select menu option:
E:19 · Press ENTER. The display shows the hysteresis level. · Use the UP I 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.
4.2.12 Menu 20
The Password function can be enabled or disabled in this Menu.
· Press MENU to open the menu system. · Using the NEXT and PREVIOUS buttons, select menu option:
E:20 · Press ENTER. The display shows the current status On or Off · Use the UP I DOWN keys to set the desired status On or Off. · 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.

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5. ROUTINE MAINTENANcE & SERVIcING
The Gasenz will provide reliable and fault free service when given regular maintenance and calibrations.
5.1 Routine Inspection and Maintenance
It is advisable to periodically inspect the Gasenz installation:
Clean 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 time interval between routine inspections should be assessed by the calibrating personnel and will depend upon the environment in which the equipment is installed.
Replacement of Sensor
The stated life of the Oxygen sensor is 18 Months under normal operating conditions. At the expiry of this period, or at shorter periods for planned preventative maintenance, the sensor will need replacing.

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Remove the two Allen-headed screws and withdraw this portion of the outer casing to reveal the sensor. The sensor simply unplugs from the internal circuit boards and the new sensor plugs into the same location. Replace the outer casing and observe the user manual instructions for sensor calibration.
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Sensor disposal.
This instrument utilises an Electro-chemical Sensor, which contains corrosive electrolyte and must not be opened or sealed membranes removed. Eye and hand protection must be worn if the sensor is leaking. Wipe and flush any electrolyte spilt on surfaces. Electrolyte can be fatal if swallowed.
Do not dispose of into normal waste, but dispose of according to local codes.

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contact Ntron at:
Mullaghboy Industrial Park, Navan, county Meath, Ireland.
Pn.: 00151(0)46 9071111 Fx.: 00151(0)46 9071111 E-mail: lnfo@ntron.com Web.: www.ntron.com

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