Oldham OLCT 10N User manual

OLCT 10N
User Manual
Part Number: NPO10NGB
Version: I.1
Digital Gas
Detector
The Fixed Gas Detection Experts

2
OLCT 10N
User Manual
Copyright 2019 by OLDHAM S.A.S
March 2019
All rights reserved. No reproduction of all or part of this document, in any
form, is permitted without the written consent of OLDHAM S.A.S.
All information provided in this document is accurate to the best of our
knowledge.
As a result of continuous research and development, the specifications of
this product may be changed without prior notice.
OLDHAM S.A.S
Rue Orfila
Z.I. Est –CS 20417
F –62027 ARRAS Cedex
Tel: [phone]
Fax: [phone]

3
Contents
Chapter 1 | Overview..............................................................7
Purpose......................................................................................................7
Composition of the Detector Assembly......................................................7
Type of detector available..........................................................................8
Chapter 2 | Installation...........................................................9
Regulations and conditions of use.............................................................9
Location of the detector..............................................................................9
Detector positioning ...................................................................................9
Connection...............................................................................................10
Configuration of communication ..............................................................12
Scope of use............................................................................................14
Chapter 3 | Maintenance ......................................................15
Maintenance Frequency...........................................................................15
Semi-automatic calibration.......................................................................16
Sensor replacement.................................................................................18
Manual calibration....................................................................................20
Chapter 5 | Spare Parts........................................................25
Chapter 6 | UE Declaration...................................................27
Chapter 7 | Specifications....................................................29
Detector....................................................................................................29
Sensor specifications ...............................................................................30
Line length (use with MX 32) ...................................................................32
Line length (use with MX 43) ...................................................................35
Chapter 8 | Specific instructions for use in explosive
atmospheres in accordance with European ATEX Directive
94/9/EC 39
General comments...................................................................................39
Marking for LEL versions .........................................................................39
Marking for toxic gas or oxygen detector versions (except CO2versions)
40

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OLCT 10N
User Manual
Thank you for choosing this OLDHAM instrument.
All necessary actions have been taken to ensure your complete satisfaction with
this equipment.
It is important that you read this entire manual carefully and thoroughly.
Limitation of Liability
OLDHAM shall not be held responsible for any damage to the equipment or for
any physical injury or death resulting in whole or in part from the inappropriate
use or installation of the equipment, non-compliance with any and all
instructions, warnings, standards and/or regulations in force.
No business, person or legal entity may assume responsibility on behalf of
OLDHAM, even though they may be involved in the sale of OLDHAM
products.
OLDHAM shall not be responsible for any direct or indirect damage, or any
direct or indirect consequence, resulting from the sale and use of any of its
products UNLESS SUCH PRODUCTS HAVE BEEN SELECTED BY
OLDHAM ACCORDING TO THE APPLICATION.
Ownership clauses
The drawings, specifications, and information herein contain confidential
information that is the property of OLDHAM.
This information shall not, either in whole or in part, by physical, electronic, or
any other means whatsoever, be reproduced, copied, divulged, translated, or
used as the basis for the manufacture or sale of OLDHAM equipment, or for
any other reason without the prior written consent of OLDHAM.

5
Warnings
This is not a contractual document. OLDHAM reserves the right to alter the
technical features of its equipment at any time and for any reason without prior
notice.
READ THESE INSTRUCTIONS CAREFULLY BEFORE USING FOR THE
FIRST TIME: these instructions should be read by all persons who have or will
have responsibility for the use, maintenance, or repair of the instrument.
This instrument shall only be deemed to be in conformance with the published
performance if used, maintained, and repaired in accordance with the
instructions of OLDHAM, by OLDHAM personnel, or by personnel authorized
by OLDHAM.
Warranty
Under normal conditions of use and on return to the factory, parts and
workmanship are guaranteed for 2 years, excluding consumables such as
sensors, filters, etc.
Destruction of equipment
European Union only. This symbol indicates that, in conformity with
directive DEEE (2002/96/CE) and in accordance with local regulations,
this product must not be discarded with household waste.
It must be disposed of in a collection area that is designated for this purpose, for
example at a site that is officially designated for recycling of electrical and
electronic equipment (EEE) or a point of exchange for authorized products in the
event of the acquisition of a new product of the same type.

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OLCT 10N
User Manual

1- Overview
7
Chapter 1 | Overview
Purpose
The OLCT 10N is a digital detector designed to detect a particular gas, depending
on the type of sensor used. This range of digital detectors is compatible only with
the Oldham MX 43 or MX32v2 controller.
Composition of the Detector Assembly
An OLCT 10N detector contains the following parts:
Rep.
Description
1.
Enclosure
2.
Cable gland
3.
PCB
4.
Sensor
5.
Terminal
6.
Gas input
7.
LED
8.
Cover

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OLCT 10N
User Manual
Figure 1: Component parts of an OLCT 10N
Type of detector available
Gas
Range
Methane (CH4)
0-100% LEL (5% vol.)
0-100% LEL (4.4% vol.)
Hydrogen (H2)
0-100% LEL (4% vol.)
Butane (C4H10)
0-100% LEL (1,5% vol.)
Propane (C3H8)
0-100% LEL (2% vol.)
Oxygen (O2)
0-30% vol.
Carbone monoxide (CO)
0-300 ppm
0-1000 ppm
Carbon dioxide (CO2)
0-5000ppm
0-5%vol.
0-100% vol.
Hydrogen sulfide (H2S)
0-30 ppm
0-100 ppm
Nitrogen monoxide (NO)
0-100 ppm
0-300 ppm
Nitrogen dioxide (NO2)
0-10 ppm
0-30 ppm
Ammonia (NH3)
0-100 ppm
0-1000 ppm

2- Installation
9
Chapter 2 | Installation
Please read the guides on the installation, use and maintenance of flammable
gas and oxygen detectors (standard EN/IEC 60079-29-2) and toxic gas
detectors (standard EN 45544-4).
Regulations and conditions of use
Where applicable, the installation should meet all the regulations currently in
force for installations in explosive atmospheres, in particular standards IEC/EN
60079-14 and IEC/EN 60079-17 (current editions).
Generally speaking, the ambient temperatures, supply voltages and power
outputs that are mentioned in this document relate to explosion safety. They
do not relate to the detector’s operating temperatures.
The equipment is authorized for use in ATEX zones 2 and 22 at ambient
temperatures between -20°C and +55°C.
The sensor in the transmitter should always be in contact with ambient air.
Therefore:
- Do not cover the detector
- Do not paint the detector
- Avoid dust
The OLCT 10N may be used only with the OLDHAM MX 43 or MX 32v2
measurement and alarm controller.
CO2 versions are not certified to use in ATEX area
Location of the detector
Depending on the density of the gas to be detected or the application, the detector
shall be positioned at ground level, or on the ceiling at the same height as the
airflow, or near air extraction ducts. Heavy gases may be detected at the ground
level, while light gases will be found at ceiling height.
Detector positioning
The detectors shall preferably be positioned in an accessible place to facilitate
inspection and maintenance as well as ensure the safety of the operators. The
detectors shall be protected against shock hazards and must not be obstructed by

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OLCT 10N
User Manual
anything that will prevent them from measuring the ambient environment for which
they are intended.
The detector shall be installed with the cable gland pointing downwards. If
installed at an angle of more than 45° from the vertical or in a horizontal position
(ceiling-type installation), the detector will not measure correctly and will need to
be re-calibrated.
Figure 2: OLCT 10N dimensions (in millimeters)
Connection
As a reminder, the OLCT 10N can only be connected to the OLDHAM MX 43 or
MX 32v2 controller.
RS485 transmission
The OLCT 10N has 2 cable glands that are used for the input cable and the output
cable to the next module.
The detectors must be connected using MPI-22A cable type, minimum core size is
0.22 mm² (RS485 cable with 2 shielded twisted pairs, nominal impedance of
100 Ohm). This cable carries the RS485 signal on one pair and the power supply
for the modules on the other pair. The +24VDC, 0V, A and B terminals are
respectively connected to the +24VDC, 0V, A and B terminals of the other

2- Installation
11
modules in the line and then to the corresponding line connector of the MX 43 or
MX 32v2 controller.
The cable shielding must be connected to a ground terminal.
The 120 end-of-line resistor must be placed at the end of the line. This simply
involves switch #8 being moved to the ON position on the last module (cf. Fig. 5).
Before connecting the detector to the control unit, please disable any installation
alarms to avoid unexpected triggering during operation. *
Connection is made according to the following schematic:
Figure 3: Schematic for connecting modules on a MX 43 or MX 32v2 line
No portion of the bare end of the terminal wires should be visible. For
protection against any electromagnetic disturbances, the data as well as screen
wires (or braids) must be cut as short as possible.
The connection of the cable between the detector and controller should be made
with the power off. The site should be at equal potential.
Controller line terminal
Ground
terminal
Detector terminal

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OLCT 10N
User Manual
Configuration of communication
Module address
All the digital modules on a line must be
identified by a unique address.
Switches 1 to 5 of the configuration block of
each module make it possible to establish an
address number (1 to 32) in binary mode.
In the illustration to the right, the address 9
(10010) has been defined.
The Addressing Table below lists the possible
combinations.
Figure 4: Switches for
address configuration
Address module
Switches
(ON = 1 ; OFF = 0)
Address module
Switches
(ON = 1 ; OFF = 0)
1
2
3
4
5
1
2
3
4
5
1
1
0
0
0
0
17
1
0
0
0
1
2
0
1
0
0
0
18
0
1
0
0
1
3
1
1
0
0
0
19
1
1
0
0
1
4
0
0
1
0
0
20
0
0
1
0
1
5
1
0
1
0
0
21
1
0
1
0
1
6
0
1
1
0
0
22
0
1
1
0
1
7
1
1
1
0
0
23
1
1
1
0
1
8
0
0
0
1
0
24
0
0
0
1
1
9
1
0
0
1
0
25
1
0
0
1
1
10
0
1
0
1
0
26
0
1
0
1
1
11
1
1
0
1
0
27
1
1
0
1
1
12
0
0
1
1
0
28
0
0
1
1
1
13
1
0
1
1
0
29
1
0
1
1
1
14
0
1
1
1
0
30
0
1
1
1
1
15
1
1
1
1
0
31
1
1
1
1
1
16
0
0
0
0
1
32
0
0
0
0
0
Table 1: Addressing table (address depends on switch positions)

2- Installation
13
Remarks:
■During module replacement, all the configuration switches of a new module
must be positioned in the same configuration as those of the previous
module.
■Switch #6 (FRAME FILLING) must be set to OFF (unused option).
■Switch #7 (DELAY) must be set to ON.
End of line resistance
For the last detector, set switch #8 (EOL
RESISTOR) to ON.
Figure 5: End of line resistor switch
in position “ON”

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OLCT 10N
User Manual
Scope of use
The OLCT 10N may be used only with the OLDHAM MX 43 or MX 32v2
measurement and alarm controller.
The sensors have certain limitations; it is essential to fully recognize these
limitations.
Presence of specific components
Vapor from components containing silicone or sulfur can affect the
catalytic sensors and thereby distort measurements. If sensors have been
exposed to these types of compound, inspection or calibration will be
necessary.
High concentrations of organic solvents (e.g. alcohols, aromatic solvents,
etc.) or exposure to quantities of gas greater than the specified range of
measurement can damage the electrochemical sensors. Inspection or
calibration is then recommended.
In the presence of high concentrations of carbon dioxide (CO2> 1% vol.),
the oxygen-measuring electrochemical sensors can slightly overestimate the
concentration of oxygen (0.1 to 0.5% vol. O2overestimate).
Operation under low oxygen levels
If an electrochemical sensor is used in an atmosphere containing less
than 1% vol. oxygen for over one hour, the measurement may be an
underestimate.
If a catalytic sensor is used in an atmosphere containing less than 10%
vol. oxygen, the measurement may be an underestimate.

3- Maintenance
15
Chapter 3 | Maintenance
Maintenance primarily involves sensor calibration and changing any sensors
that no longer meet their initial performance characteristics.
Since they are liable to affect detection reliability, the tasks
described in this chapter are reserved for authorized trained
personnel only.
Inspection and maintenance shall be carried out in accordance
with standard EN/IEC 60079-17. The instructions contained in the
ATEX marking shall be observed (see Chapter 8).
When first powered up or after a sensor replacement, wait for 1
hour before performing a calibration.
It is impossible to calibrate an OLCT 10N within 10 minutes after a
power cycle.
Maintenance Frequency
Gas detectors are safety devices. OLDHAM recommends the regular testing of
fixed gas detection installations. This type of test consists of injecting the
calibration gas into the detector at a sufficient concentration to activate the pre-set
alarms. It is to be understood that this test is in no way a replacement for a
detector calibration.
The frequency of gas tests depends on the industrial application where the
detector is in use. Frequent inspections should be made in the months following
the commissioning of the installation, and should then become more widely
spaced provided that no significant deviation is observed. If a detector should fail
to react in contact with the gas, calibration is essential. The frequency of
calibrations shall be appropriate according to the results of the tests (humidity,
temperature, dust, etc.); however, it must not exceed one year.
The general manager should put safety procedures in place on-site. OLDHAM
cannot be held responsible for their enforcement.

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OLCT 10N
User Manual
The OLCT 10N can be calibrated either:
- Manually
- Automatically
The manual calibration must be done only after each sensor or
detector replacement.
A manual calibration must be followed by an automatic
calibration.
Please find below the different calibration gas concentrations.
Gas
Range
Calibration gas
concentration
Methane (CH4)
0-100% LEL (5% vol.)
0-100% LEL (4.4% vol.)
2.5% CH4/Air (50% LEL)
2.2% CH4/Air (50% LEL)
Hydrogen (H2)
0-100% LEL
2.0% H2/Air (50% LEL)
Butane (C4H10)
0-100% LEL
0.9% C4H10/Air (60% LEL)
Propane (C3H8)
0-100% LEL
1.1% C3H8/Air (55% LEL)
Oxygen (O2)
0-30% vol.
20.9% O2
Carbone monoxide (CO)
0-300 ppm
0-1000 ppm
100 ppm CO
300 ppm CO
Carbone dioxide (CO2)
0-5000 ppm
0-5% vol.
0-100% vol.
3000 ppm CO2
2.5% CO2
50% CO2
Hydrogen sulfide (H2S)
0-30 ppm
0-100 ppm
25 ppm H2S
25 ppm H2S
Nitrogen monoxide (NO)
0-100 ppm
0-300 ppm
50 ppm NO
50 ppm NO
Nitrogen dioxide (NO2)
0-10 ppm
0-30 ppm
10 ppm NO2
10 ppm NO2
Ammonia (NH3)
0-100 ppm
0-1000 ppm
100 ppm NH3
1000 ppm NH3
Semi-automatic calibration
While the OLCT 10N is calibrating, the MX 43 or the MX 32v2 inhibits alarms
triggered by the detector and displays a maintenance code. Up to 32 sensors can
be calibrated at the same time.

3- Maintenance
17
Cal ON Attachment of gas injection device
Cal OFF Removal of gas injection device
Tempo Temps d'attente indiqué dans la colonne tempo
Cal OFF
LED is OFF
GREEN blinking
GREEN steady
RED blinking
RED steady
LED sensor status
START
END
Normal Operating
Mode
Inject zero air
(Nitrogen in the case of
an OLCT 10N O2)
and wait for stabilization
Zero is stable
Internal processing
(20 to 60 s)
LED turns off as it
passes or blinks as it
fails
Cal ON
Calibration is
complete and
validated
LED turns off as it
passes or blinks as it
fails
Zeroing is complete
and validated
Remove the cap
and apply it again
within 30 seconds
Inject span gas and
wait for stabilization
Signal is stable
Internal processing
(20 to 60 s)
Cal OFF
Cal OFF
Cal ON

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OLCT 10N
User Manual
Semi-automatic calibration device (P/N 6331163)

3- Maintenance
19
Sensor replacement
Sensors should be replaced as a part of regular preventative maintenance or
following a failed calibration test.
After a sensor replacement, both manual and automatic
calibrations must to be conducted.
To change the sensor:
1. Remove the detector cover
2. Push and hold down the
sensor replacement
button (1) for 5 seconds
until the solid green
LED (2) is on.
3. Release the button
4. Replace the sensor and
conduct both manual and
automatic calibrations
(This is a mandatory step)
Figure 6: Sensor
replacement
In order to comply with the ATEX rules, the sensor of LEL
detectors is soldered to the card and cannot be changed
separately. The entire OLCT 10N detector will need to be replaced.
As the detector is factory calibrated, there is no point attempting
manual calibration. However, a sensor change must be declared
using the maintenance menu of the MX 43 or MX 32v2 controller
(see MX 43 or MX 32v2 manual).

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OLCT 10N
User Manual
Manual calibration
A voltmeter and the female connector provided by Oldham (P/N 6116291) are
required.
1. Remove the detector cover.
2. Connect the connector to the circuit’s male connector
3. Connect the voltmeter between S+ and S- (value in mV)
Zero the sensor
1. Ensure that the sensor is in clean air (in absence of O2 in the case of
OLCT 10N O2). If not, inject zero air (Nitrogen in the case of an OLCT 10N
O2) into the sensor at a flow rate of 1 l/min, then wait for voltmeter signal to
stabilize (use the calibration gas kit: zero air cylinder, calibration cap, tube).
2. Adjust the zero with the potentiometer’s ZERO until the voltmeter reads 0
mV.
Sensitivity
1. Now inject the calibration gas (1 l/min) into the sensor. Wait for the
voltmeter signal to stabilize (use the calibration gas kit: calibration gas
cylinder, calibration cap, tube).
2. Adjust the sensitivity if necessary with the potentiometer “SENS” until the
signal value (in mV) corresponds to the concentration in the reference gas
used. Use the following formula to calculate the correct value for the
signal.
3. Stop injecting gas (remove the calibration pipe from the sensor).
4. Wait for the voltmeter to “return to zero”.
U
(mV)
=
1600
x
reference gas concentration
measurement scale