Oldham CTX 300 CO2 User manual

User manual
CTX 300 CO2
Analogic CO2Gas Detector
Part Number: NP300CO2GB
Revision: B.0
07/2015→
The Fixed Gas Detection Experts

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CTX 300
User manual
Copyright 2016 by Oldham S.A.S.
April 2016
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]

Contents
3
Contents
Chapter 1 | General Information ..............................................5
User Manual...............................................................................................5
Symbols used.............................................................................................5
Safety instructions......................................................................................6
Important information.................................................................................6
Liability limits..............................................................................................7
Chapter 2 | Introduction ...........................................................9
General Information ...................................................................................9
CTX300 CO2versions..............................................................................10
Composition .............................................................................................10
Chapter 3 | Installation and connection................................11
Installing the detectors .............................................................................11
Electrical connections ..............................................................................13
Chapter 4 | Powering up and use ..........................................17
Powering up .............................................................................................17
4-20 mA analog output.............................................................................17
Chapter 5 | Maintenance ........................................................18
Calibration................................................................................................18
Checking the current generator................................................................23
Replacing a sensor ..................................................................................24
Disposal....................................................................................................24
Chapter 6 | Spare parts ..........................................................25
CTX 300 CO2...........................................................................................25
Chapter 7 | Certification .........................................................27

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CTX 300
User manual
Chapter 8 Technical specifications.......................................29
Chapter 9 | Annex...................................................................31
CTX 300 overview....................................................................................31

1 –General information
5
|
Chapter 1 |General Information
User Manual
The instructions given in this manual must be read thoroughly before installation and
start-up, particularly those concerning the points related to the safety of the end-user.
This user manual must be made available to every person involved in the activation,
use, maintenance, and repair of the unit. The information, technical data, and diagrams
contained in this manual are based on the information that is available at a given time.
In case of doubt, contact Oldham for additional information.
The aim of this manual is to supply simple and accurate information to the user.
Oldham cannot be held liable for any misinterpretations in the reading of this manual.
In spite of our efforts to produce an error-free manual, it may nonetheless contain
some unintentional technical inaccuracies.
In the client’s interest, Oldham reserves the right to modify the technical characteristics
of its equipment to increase their performance without prior notice. The present
instructions and their content are the inalienable property of Oldham.
Symbols used
Icon
Significance
This symbol indicates useful additional information.
This symbol indicates:
This equipment must be connected to ground.
This symbol indicates:
Protective earth terminal. A cable of the adequate diameter must be
connected to ground and to the terminal having this symbol.

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CTX 300
User manual
This symbol indicates:
You must refer to the instructions.
This symbol indicates:
Warning! In the present mode of use, failure to adhere to the
instructions preceded by this symbol can result in a risk of electric
shock and/or death.
European Union (and EEA) only. This symbol indicates that this product
must not be discarded with household waste, as per the EEA directive
(2002/96/EC) and your own national regulations.
This product must be disposed of at a collection point that is reserved for
this purpose, for example, an official site for the collection of electrical and
electronic equipment (EEE) in view of their recycling, or a point of
exchange for authorized products that is accessible when you acquire a
new product of the same type.
Any deviation as regards these recommendations for the disposal of this
type of waste can have negative effects on the environment and public
health, as these electric and electronic products generally contain
substances that can be dangerous. Your full cooperation in the proper
disposal of this product promotes a better use of natural resources.
Safety instructions
Labels intended to remind you of the principal precautions of use have been placed on
the unit in the form of pictograms. These labels are considered an integral part of the
unit. If a label falls off or becomes illegible, please ensure it is replaced. The
significance of the labels is detailed below.
The installation and electrical connections must be carried out by qualified
personnel according to the instructions of the manufacturer and the
standards of the competent authorities.
Failure to adhere to the instructions can have serious consequences on the
safety of persons. Please be extremely rigorous as regards electricity and
assembly (coupling, network connections).
Important information
The modification of the material and the use of parts of an unspecified origin shall
entail the cancellation of any form of warranty.
The use of the unit has been projected for the applications specified in the technical
characteristics. Exceeding the indicated values cannot in any case be authorized.

1 –General information
7
Liability limits
Neither Oldham nor any other associated company under any circumstances can be
held liable for any damage, including, without limitations, damages for loss or
interruption of manufacture, loss of information, defect of the MX 43 control unit,
injuries, loss of time, financial or material loss, or any direct or indirect consequence of
loss occurring in the context of the use or impossibility of use of the product, even in
the event that Oldham has been informed of such damage.

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CTX 300
User manual

2 - Introduction
9
Chapter 2 |Introduction
General Information
CTX300 CO2gas detectors are designed to measure carbon dioxide. With robust
materials, a specifically-adapted design, appropriate accessories, stainless bolts
and a polyamide case (IP54), CTX 300 detectors are designed to withstand the
roughest conditions.
Figure 1: overview of a CTX 300 with display (left) and without display (right).

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CTX 300
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CTX300 CO2versions
In the case of a CTX 300 for the CO2detection, this manual can only
be used for devices delivered since July 2015.
P/N : 6514879
P/N : 6514880
P/N : 6514881
P/N : 6514882
P/N : 6314124
Figure 2: CTX 300 CO2detector
delivered before July 2015
Figure 3: CTX 300 CO2detector
delivered since July 2015
Composition
Sensor type
CTX 300
Gases
detected
CO2.
Detection
method
Infrared absorption.
Type of sensor
pack
Pre-calibrated removable sensor
pack (1).
Options
With display.
Certification
None
(1) Choice between several scales.

3 - Installation and connection
11
Chapter 3 |Installation and connection
Installing the detectors
Layout
While the measuring sensor is always located on the underside of the detector, several
factors determine where the detector should be located:
■If the gas being measured is lighter than the air, place the detector near the ceiling.
■If the gas is heavier than the air (CO2and Freons, for example) place the detector
close to the floor.
■Near offtake points.
■Generally, in locations where gas may accumulate, taking into consideration both:
- The effects of temperature;
- The outside winds direction.
Determining the best sensor location
Factors to consider when determining the best placement for the detector are:
■Potential sources for vapor and gas emissions.
■Characteristics of gases and vapors (density).
■Air circulation:
- Inside: mechanical or natural ventilation.
- Outside: wind direction and velocity.
■Effects of temperature.
■Local constraints (air flow, water splash, etc.).
Detectors should always be located in an easily accessible location for maintenance
purposes.
Special accessories may be necessary to protect the equipment against any liquid
projectiles, dust, direct sunlight or low temperatures in the area.

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CTX 300
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Mechanical installation
Figure 4: overall dimensions of the CTX 300.
Figure 5: drilling diagram for wall mounting (view of the side flatten onto the ceiling).

3 - Installation and connection
13
Figure 6: ceiling mounting with a brace. The fixing drawing is identical to this of the wall
mount.
Ref.
Qty
Description
Code
Material
1
1
Brace
6132380
Stainless
2
4
Washer A25 ACCD
6905518
Stainless
3
4
Screw CHC LI2
6902218
Stainless
Electrical connections
Wiring specifications
If needed, consult the grounding instructions for Oldham instruments and related
connection materials in Annex 1.
Connections for the various types of sensors
Wire
CTX 300CO2
withdisplay
CTX 300CO2
without display
Output signal
4-20 mA
4-20 mA
Active wires
3
3
Cable entry
1 x 6-11 mm
1 x 6-11 mm

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CTX 300
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Connection of a 3-wire sensor to an Oldham control unit
Wire
Terminal number
(+) V DC power supply:
3
(-) V DC power supply (masse 0 V):
2
Output signal:
1
Figure 7: connection of a 3-wire sensor to an Oldham control unit.
Connection of a 3-wire CTX300 sensor to a non-OLDHAM control unit with an internal
power supply
Figure 8: Connection of a 3-wire CTX300 sensor to a non-OLDHAM control unit.
(R) Maximal load = 200 Ω.
(A) Power supply 15 ≤ Vcc ≤ 32.
18 ≤ Vcc ≤ 30 for CO2sensor.
I max = 100 mA.
Control unit
Detector
Other control
unit
Detector
+24 VDC
0V
Signal
+24 VDC
0V
Signal

3 - Installation and connection
15
Operating mode
CTX300 with display
■Remove the 4 screws (ref. 1).
■Remove the cover (ref. 2).
Figure 9
■Completely remove the screw (ref. 4).
■Unscrew the screw a few turns
(ref. 3).
Figure 10
■Turn the display circuit as shown
(ref. 5).
■Connect the cable (ref. 6) to the
connector. Refer to paragraph
Connections for the various types of
sensors on page 13.
■Return the display circuit to its original
position and replace the cover.
Figure 11

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CTX 300
User manual
CTX 300 without display
■Unscrew the 4 screws (ref. 1).
■Remove the cover (rep. 2).
■Proceed to wire the sensor according
to the terminal location.
Figure 12

4 –Powering up and use
17
Chapter 4 |Powering up and use
Powering up
■The sensor turns on when connected
to a power supply.
■If the sensor has a display, the green
LED will be lit (ref. 2) and a value will
appear on the display screen (ref. 1).
Figure 13
4-20 mA analog output
For CTX 300 sensors, the 4-20 mA output current is proportional to the gas level.
Notes:
The various states of the 4-20 mA output are:
■1.5 mA to indicate an electronic fault.
■1.8 mA to indicate an absence of sensor.
■Between 4 and 20 mA for measurement values.
■≥ 20 mA if levels exceed measurement range.

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CTX 300
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Chapter 5 |Maintenance
The adjustment operations in this paragraph are reserved for authorized,
trained personnel because they may compromise detection reliability.
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.
Calibration
Recommendations
Calibration consists of adjusting the zero of the clean air sensor and adjusting
sensitivity with a test gas. Adjustments are made at the sensor level.
Equipment needed to calibrate the detector correctly:
■Flexible plastic tubing (Figure 14, ref. 2).
■Manometer and regulator valve for the compressed gas cylinders (rep. 3).
■0 to 60 l/h flow meter (if the cylinder is not equipped with one).
■Calibration pipe (ref. 1), which may vary depending on the nature of the gas (see
pages 25 and following).
■Test gas cylinder (ref. 4).

5 –Maintenance
19
Figure 14: sensor calibration assembly.
Zero adjustment should be performed in a gas and vapor free area. If this is not
possible, synthetic bottled air can be injected at a rate of 60 l/h.
Use a bottle of test gas to adjust sensor sensitivity (concentration close to the alarm
threshold or corresponding to 30% of the measurement range at a minimum). The
recommended rate is 60 l/h.
Note: when dealing with dangerous gases, you MUST consult a specialized Oldham
technician or use another sensor pack recently pre-calibrated at a factory.
The detector should be calibrated using the intended flow-rate. The actual
concentration of gas may be underestimated if the detector was calibrated
with too high of a flow rate.

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CTX 300
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CTX 300 calibration
1st case: CTX 300 with display
■The sensor is operating: the green
light (ref. 1) is lit and the display
screen shows the measurement level.
Figure 15
■Verify that the sensor is located in a
clean-air environment. If not, inject
synthetic air at a flow rate of 60 l/h.
■Wait for the measurement to stabilize
(displayed on screen) and adjust the
zero by using the ZERO
potentiometer located on the sensor
pack (ref. 2).
■Inject the recommended calibration
gas at a flow rate of 60 l/h.
■Wait for the measurement to stabilize.
■Adjust the sensitivity by using the
sensitivity potentiometer located on
the sensor pack (rep. 1).
Figure 16
■Stop injecting the calibration gas.
■Remove the gas injection pipe, then
wait and verify that the signal returns
to zero. Repeat procedure if it does
not.
■Calibration is complete.