Teledyne 700 IR Series User manual

NP700IRIMEN-Revision E.0
700 IR SERIES
INFRARED GAS DETECTOR
FOR COMBUSTIBLE AND CO2GASES
OLCT 700
OLCT 710
INSTRUCTION
MANUAL

700 IR SERIES
INFRARED GAS DETECTOR FOR COMBUSTIBLE AND CO2
GASES
USER MANUAL
II
NP700IRIMEN
Revision E.0
Instruction manuals in other languages are available on
Website https://teledynegasandflamedetection.com
Copyright November 2023 by TELEDYNE OLDHAM SIMTRONICS S.A.S.
All rights reserved. No reproduction of all or part of this document, in any form, is permitted
without the written consent of TELEDYNE OLDHAM SIMTRONICS S.A.S.
All of the information that is 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.
TELEDYNE OLDHAM SIMTRONICS S.A.S.
Rue Orfila
Z.I. Est – CS 20417
62027 ARRAS Cedex

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Table of Contents
1Introduction.......................................................................................... 1
1.1 Description................................................................................................................1
1.2 Modular Mechanical Design...................................................................................3
1.3 Plug-in Replaceable Sensor.....................................................................................5
2Installation ........................................................................................... 7
2.1 ATEX Operational Guidelines for Safe Use ............................................................7
2.2 Functional Safety (SIL 2) ..........................................................................................8
2.3 Detector Placement ..................................................................................................8
2.4 Sensor Contaminants and Interference ...................................................................10
2.5 Mounting Installation................................................................................................10
2.6 Electrical Installation.................................................................................................11
2.7 Field Wiring..............................................................................................................12
2.8 Initial Start Up...........................................................................................................16
3Operation ............................................................................................ 17
3.1 Programming Magnet Operating Instructions.........................................................17
3.2 Operator Interface ...................................................................................................18
3.3 Normal Operation ...................................................................................................19
3.4 Calibration Mode (AutoZero and AutoSpan).........................................................20
3.5 Program Mode.........................................................................................................23
3.6 Program Features .....................................................................................................29
4RS-485 Modbus™ Protocol ................................................................. 33
5Service and Maintenance.................................................................... 35
5.1 Calibration Frequency..............................................................................................35
5.2 Visual Inspection.......................................................................................................35
5.3 Condensation Prevention Packet .............................................................................35
5.4 Replacement of IR Plug-in Combustible Gas Sensor...............................................36
6Troubleshooting Guide ........................................................................ 37
7Appendix ............................................................................................. 41
7.1 Specifications ...........................................................................................................41
7.2 Spare Parts, Detector Accessories, Calibration Equipment....................................43
7.3 OLCT 700/710 IR Drawings..................................................................................44

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Table of Figures
Figure 1: Sensor Cell Construction ......................................................................................................... 2
Figure 2: Principle of Operation.............................................................................................................. 3
Figure 3: Detector Assembly Breakaway................................................................................................ 4
Figure 4: OLCT 700 Assembly Front View............................................................................................ 4
Figure 5: OLCT 710 Front View............................................................................................................. 5
Figure 6: OLCT 700/710 IR Plug-in Sensor Cell.................................................................................... 5
Figure 7: ATEX Approval Label............................................................................................................. 7
Figure 8: Outline and Mounting Dimensions........................................................................................ 11
Figure 9: Typical Installation ................................................................................................................ 12
Figure 10: Detector Wire Connections.................................................................................................. 15
Figure 11: Magnetic Programming Tool............................................................................................... 17
Figure 12: Magnetic Programming Switches........................................................................................ 17
Figure 13: OLCT 700/710 IR Software Flowchart ............................................................................... 19
Figure 14: OLCT 700 Assembly ........................................................................................................... 36
List of Tables
Table 1: Wire Gauge vs. Distance......................................................................................................... 13
Table 2: Gas Factors.............................................................................................................................. 26
Table 3: Modbus™ Registers................................................................................................................ 33
Table 4: Modbus™ Special Registers ................................................................................................... 34

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Thank you for choosing this TELEDYNE OLDHAM SIMTRONICS instrument. All of the necessary
actions have been taken in order to ensure your complete satisfaction with this equipment. It is
important that you read this entire manual carefully and thoroughly.
Limitation of Reliability
•TELEDYNE OLDHAM SIMTRONICS ll 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, installation, or storage of the equipment, which is the result of not
complying with the instructions and warnings, and/or with the standards and regulations in
force.
•TELEDYNE OLDHAM SIMTRONICS does not support or authorise any business, person, or
legal entity in assuming responsibility on behalf of TELEDYNE OLDHAM SIMTRONICS, even
though they may be involved in the sale of TELEDYNE OLDHAM SIMTRONICS products.
•TELEDYNE OLDHAM SIMTRONICS shall not be responsible for any damage, direct or
indirect, or for damages and interest, direct or indirect, resulting from the sale and use of any
of its products UNLESS SUCH PRODUCTS HAVE BEEN DEFINED AND CHOSEN BY
TELEDYNE OLDHAM SIMTRONICS FOR THE USE THAT THEY ARE INTENDED.
Ownership clauses
•The drawings, specifications, and information herein contain confidential information that is
the property of TELEDYNE OLDHAM SIMTRONICS.
•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 TELEDYNE OLDHAM SIMTRONICS equipment, or for any other
reason without the prior consent of TELEDYNE OLDHAM SIMTRONICS.
Warning
•This is not a contractual document. In the best interest of its customers and with the aim of
improving performance, TELEDYNE OLDHAM SIMTRONICS reserves the right to alter the
technical features of its equipment without prior notice.
•READ THESE INSTRUCTIONS CAREFULLY BEFORE THE FIRST USAGE: 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 TELEDYNE
OLDHAM SIMTRONICS by TELEDYNE OLDHAM SIMTRONICS personnel or by
personnel authorised by TELEDYNE OLDHAM SIMTRONICS.

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Guarantee
•Under normal conditions of use and on return to the factory, sensors and electronics parts
are guaranteed for 2 years from date of shipment; excluding consumables as dessiccant,
filters, etc.
Waste Electrical and Electronic Equipment (WEEE directive)
European Union (and EEA) only. This symbol indicates that, in conformity with directive
DEEE (2002/96/CE) and according to local regulations, this product may not be
discarded together with household wasteIt must be disposed of in a collection area that
is set aside for this purpose, for example at a site that is officially designated for the
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 as
before.

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1Introduction
1.1 Description
Teledyne Oldham Simtronics OLCT 700 IR combustible gas transmitters are non-intrusive “Smart”
detectors designed to detect and monitor combustible hydrocarbon or CO2gases in air. The
range of detection is 0-100% LEL or from 5 to 100% volume of CO2. The detector features an
LED display of current reading, fault and calibration status. The unit is equipped with standard
analog 4-20mA and Modbus™ RS-485 outputs. A primary feature of the detector is its method
of automatic calibration, which guides the user through each step via fully scripted instructions
shown on the LED display.
The microprocessor-supervised electronics are packaged in an encapsulated module and housed
in an explosion proof casting. The unit includes a 4 character alpha/numeric LED used to display
detector readings and the detector’s menu-driven interface when the hand-held programming
magnet is used.
The OLCT 710 is made of an OLCT 700 attached to a flameproof junction that includes terminal
blocks and an optional surge protection board. The complete assembly is flameproof certified
« Ex d » and carries ATEX approval (see section 2.1 - ATEX Operational Guidelines for Safe Use).
The OLCT 700 is flameproof certified and carries ATEX approval. The OLCT 700 shall be
attached to an increased safety certified junction box when used in an ATEX zone (see section
see section 2.1 - ATEX Operational Guidelines for Safe Use).
OLCT 710
OLCT 700

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1.1.1 Non-Dispersive Infrared (NDIR) Optical Sensor Technology
The sensor technology is designed as a miniature plug-in replaceable component, which can
easily be changed out in the field. The NDIR sensor consists of an infrared lamp source, two pyro
electric detectors, and an optical gas sample chamber. The lamp source produces infrared
radiation, which interacts with the target gas as it is reflected through the optical gas sample
chamber. The infrared radiation contacts each of the two pyro electric detectors at the completion
of the optical path. The “active” pyro electric detector is covered by a filter specific to the part of
the IR spectrum where the target gas absorbs light. The “reference” pyro electric detector is
covered by a filter specific to the non-absorbing part of the IR spectrum. When the target gas is
present, it absorbs IR radiation and the signal output from the active detective decreases
accordingly. The reference detector output remains unchanged. The ratio of the active and
reference detector outputs are then used to compute the target gas concentration.
The technique is referred to as non-selective and may be used to monitor most any combustible
hydrocarbon gas. The technique for CO2is similar except that the sensor provides a selective
response to CO2. Unlike catalytic bead type sensors, Teledyne Oldham Simtronics IR sensors are
completely resistant to poisoning from corrosive gases and they can operate in the absence of an
oxygen background. The sensors are characteristically stable and capable of providing reliable
performance for periods exceeding 5 years in most industrial environments.
Figure 1: Sensor Cell Construction
1.1.2 Principle of Operation
The target gas diffuses through a sintered stainless steel flame arrestor and into the volume of the
sample gas optical chamber. An alternating miniature lamp provides a cyclical IR radiation
source, which reflects through the optical gas sample chamber and terminates at two pyro electric
detectors. The active and reference pyro electric detectors each give an output which measures
the intensity of the radiation contacting their surface. The active detector is covered by an optical
filter specific to the part of the IR spectrum where the target gas absorbs light. The reference
detector is covered by a filter specific to the non-absorbing part of the IR spectrum.

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When present, the target gas absorbs a fraction of the IR radiation and the signal output from the
active detector decreases accordingly. The signal output of the reference detector remains
unchanged in the presence of the target gas. The ratio of the active/reference signal outputs is
then used to compute the target gas concentration. By using the ratio of the active/reference
signal outputs, measurement drift caused by the changes in the intensity of the IR lamp source or
changes in the optical path’s reflectivity is prevented.
Figure 2: Principle of Operation
1.1.3 Performance Characteristics
The IR sensor maintains strong sensitivity to most all combustible hydrocarbon gases in the Lower
Explosive Limit (LEL) range. When compared with the typical catalytic bead LEL sensor, the IR
sensor exhibits improved long-term zero and span stability. Typical zero calibration intervals
would be quarterly to semi-annual and typical span intervals would be semi-annual to annual.
However, actual field experience is always the best determination of appropriate calibration
intervals.
NOTE: The OLCT 700/710 IR detector will not respond to combustible gases that are not
hydrocarbons, such as H2, NH3, CO, H2S, etc.. It can only be used to measure hydrocarbon type
gases.
The IR sensor generates different signal sensitivity levels for different combustible hydrocarbon
target gases. Unless otherwise specified the OLCT 700/710 IR detector will be factory calibrated
for methane service. If the target hydrocarbon gas is other than methane, then the unit will have
to be span calibrated and configured accordingly per this Instruction Manual.
1.2 Modular Mechanical Design
The OLCT 700 IR Detector Assembly is completely modular and made up of four parts (See Figure
below):

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Plug-in Replacable
Combustible
Hydrocarbon Sensor
MODEL
IR-700
detcon inc.
LEL Sensor
Splash Guard
Housing Bottom
Assembly
O-Rings
detcon inc.
Lens and LCD
Display
Housing Bottom
Locking Set-Screw
Magnetic
Programming
Switches
Intelligent Transmitter Module (ITM)
Micro-Processor controlled circuit
encapsulated in an explosion proof
housing.
Figure 3: Detector Assembly Breakaway
1) OLCT 700 IR Intelligent Transmitter Module (ITM). The ITM is a fully encapsulated
microprocessor-based package that accepts a plug-in field replaceable sensor. Circuit
functions include LED display, magnetic programming switches, a linear 4-20mA DC
output, and a Modbus™ RS-485 output. Magnetic program switches allow non-intrusive
operator interface.
2) Field Replaceable Plug-in Infra-Red Gas Sensor
3) Housing Bottom Assembly (contains the Housing Bottom, Flame Arrestor, Retaining Ring,
and rubber O-Rings)
4) Splash Guard.
NOTE: All metal components are constructed from electro-polished 316 Stainless Steel in order
to maximize corrosion resistance in harsh environments.
Program Switch #1
LED Display
Program Switch #2
MODEL
IR-700
detcon inc.
LEL Sensor
Splash Guard Adapter
Locking Set-Screw
Figure 4: OLCT 700 Assembly Front View
OLDHAM
LEL-LIE-
UEG
OLDHAM

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OLCT 710 is made of an OLCT 700 attached to a flameproof certified junction box for terminal
connections.
Figure 5: OLCT 710 Front View
1.3 Plug-in Replaceable Sensor
The Teledyne Oldham Simtronics IR combustible hydrocarbon gas sensor is a unique and
miniaturized single-package optical design that generates enough internal heat to prevent
condensation. It is packaged as a true plug-in replaceable type sensor with over-sized gold-
plated connections that eliminate corrosion problems. It can be accessed and replaced in the
field very easily by releasing the locking screw and unthreading the housing bottom. The Teledyne
Oldham Simtronics IR combustible hydrocarbon gas sensor and the CO2gas sensor have an
infinite shelf life, and are supported by a 2-year warranty. The expected service life is 5 years or
greater.
Figure 6: OLCT 700/710 IR Plug-in Sensor Cell
M34 - ¾ NPT Adapter
Locking Screw
Cover
Locking Screw

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2Installation
2.1 ATEX Operational Guidelines for Safe Use
OLCT 700/710 conforms to the requirements of European Directive ATEX 2014/34/UE
relating to explosive Gas atmospheres.
The information given in the following sections should be respected and taken into account by the
manager of the site where the equipment is installed. As far as the aim of improving the health
and safety of workers who are exposed to the risks of explosive atmospheres is concerned, refer
to European Directive ATEX 1999/92/CE.
1) Install detector only in areas with classifications matching with those described on the ATEX
approval label. Follow all warnings listed on the label.
Figure 7: ATEX Approval Label
2) Cable glands shall be flameproof certified («Ex d») for use in explosive atmospheres.
Ingress Protection will be greater or equal to IP66. Cable glands will be mounted according
to IEC/EN 60079-14 standard, edition in force, and to additional requirements from local
standards. They shall be of M20x1.5 and the engagement shall be 5 threads at least.
Cables used shall have an operating temperature range equal or greater than 80 °C.
3) The threaded joints may be lubricated to maintain flameproof protection. Only non-
hardening lubricants or non-corrosive agents having no volatile solvents may be used.

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4) A good ground connection should be verified between the sensor’s metal enclosure and
the junction box. If a good ground connection is not made, the sensor can be grounded to
the junction box using the sensor’s external ground lug. Also verify a good ground
connection between the junction box and earth ground. Installer shall use ring terminal to
make connection to earth ground to be secured by screw and lock washer on sensor
housing. Caution: do not loosen or twist the protective earth conductor. An earth conductor
shall be mounted so that it is secured against loosening and twisting.
5) Ensure the Housing Bottom is threaded tightly to the Intelligent Transmitter Module. The
locking setscrew (M3.5 x 0.6 6g6h Stainless Steel Allen set screw cup point with yield
strength of greater than 40,000 PSI, typical 80,000 PSI) should then be tightened down
to keep the Housing Bottom from being inadvertently removed or from becoming loose
under vibration. The locking setscrew ensures that Housing Bottom is only removable by
authorized personnel with the use of special tools. A M1.5 Allen Wrench is required. If
screw requires replacement, only an identical screw may be used.
6) Removal of the Housing Bottom violates the Ex d protection method and hence power must
be removed from the detector prior its safe removal.
7) Proper precautions should be taken during installation and maintenance to avoid the build-
up of static charge on the plastic components of the detector. These include the splashguard
and splashguard adapter.
8) When used in ATEX zone, OLCT 700 shall be attached to increased safety certified junction
box only.
9) The sensor shall be installed on a metallic grounded structure such as the final assembly
assures that sensor enclosure is bonded to ground.
10) Proper precautions shall be taken during installation, operation, maintenance and service
of the product in order to avoid the build-up of static charges on the plastic splashguard.
11) The equipment manufacturer shall be contacted for information on the dimensions of the
flameproof joints.
12) The screws holding down the retaining plate are special fasteners of type: stainless steel,
Philips pan-head machine screws, M3 x 0,5 6g having yield strength greater than 40000
PSI.
2.2 Functional Safety (SIL 2)
Refer to safety user manual NP700IRSMEN
2.3 Detector Placement
Selection of detector location is critical to the overall safe performance of the product. Five factors
play an important role in selection of detector locations:
(1) Density of the gas to be detected
(2) Most probable leak sources within the industrial process
(3) Ventilation or prevailing wind conditions
(4) Personnel exposure.

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(5) Maintenance access.
Density
Placement of detectors relative to the density of the target gas is such that detectors for the
detection of heavier than air gases should be located within 4 feet of grade as these heavy gases
will tend to settle in low lying areas. For gases lighter than air, detector placement should be 4-8
feet above grade in open areas or in pitched areas of enclosed spaces.
NOTE: Methane is lighter than air. Most other combustible hydrocarbon gases are heavier than
air. Compare the molecular weight, density, or specific gravity of the target gas(es) with that of
air to determine appropriate placement.
Leak Sources
The most probable leak sources within an industrial process include flanges, valves, and tubing
connections of the sealed type where seals may either fail or wear. Other leak sources are best
determined by facility engineers with experience in similar processes.
Ventilation
Normal ventilation or prevailing wind conditions can dictate efficient location of gas detectors in
a manner where the migration of gas clouds is quickly detected.
Personnel Exposure
The undetected migration of gas clouds should not be allowed to approach concentrated
personnel areas such as control rooms, maintenance or warehouse buildings. A more general
and applicable thought toward selecting detector location is combining leak source and
perimeter protection in the best possible configuration.
Maintenance Access
Consideration should be given to providing easy access for maintenance personnel.
Consideration should also be given to the consequences of close proximity to contaminants that
may foul the sensor prematurely.
NOTE: In all installations the gas detector should point straight down (refer to Figure 8: Outline
and Mounting Dimensions. Improper detector orientation may result in false readings and
permanent detector damage.
Additional Placement Considerations
The detector should not be positioned where it may be sprayed or coated with surface
contaminating substances. Painting detector assemblies is prohibited.
Although the detector is designed to be RFI resistant, it should not be mounted in close proximity
to high-powered radio transmitters or similar RFI generating equipment.
When possible, mount the detector in an area void of high wind, accumulating dust, rain, or
splashing from hose spray, direct steam releases, and continuous vibration. If the detector cannot
be mounted away from these conditions then make sure the Teledyne Oldham Simtronics Harsh
Environment Splashguard accessory is used (PN DET-943-002273-000).

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Do not mount in locations where temperatures will exceed the operating temperature limits of the
detector. Where direct sunlight leads to exceeding the high temperature-operating limit, use a
sunshade to help reduce temperature.
2.4 Sensor Contaminants and Interference
Teledyne Oldham Simtronics OLCT 700/710 IR combustible hydrocarbon gas detectors may be
adversely affected by exposure to certain airborne substances. Loss of sensitivity or corrosion
may be gradual if such materials are present in sufficient concentrations.
The performance of the IR sensor may be impaired during operation in the presence of substances
that can cause corrosion on gold plating. Other inhibiting substances are those that can coat the
internal walls of the optical chamber and reduce reflectivity. These include but are not limited to
heavy oil deposits, dust/powder, water condensation, and salt formation. Continuous and high
concentrations of corrosive gases (such as Cl2, H2S, HCl, etc.) may also have a detrimental long-
term effect on the sensor’s service life.
The presence of such substances in an area does not preclude the use of this sensor technology,
although it is likely that the sensor lifetime will be shorter as a result. Use of this sensor in these
environments may require more frequent calibration checks to ensure safe system performance.
For the OLCT 700/710 IR Combustible gas detectors there are no known cross-interference
gases that are not combustible hydrocarbon gases. For the OLCT 700/710 IR CO2detector,
there are no known cross interference gases.
2.5 Mounting Installation
•The installation should meet all the regulations currently in force for installations in explosive
atmospheres, in particular the standards IEC/EN 60079-14 and IEC/EN 60079-17
(whichever editions are in force) or in accordance with other national standards.
•The equipment is allowed in ATEX zones 1 and 2 for ambient temperatures ranging from -
40 °C to +70 °C. Understand that operating temperature range may be different (see
technical specifications).
•The sensor shall always be in contact with ambient air. Therefore,
- do not cover the detector
- do not paint detector assemblies
- avoid dust accumulation
The OLCT 700/710 IR should be vertically oriented so that the detector points straight downward
(see Figure below). Installation of the enclosure shall be secured with 4 x M6 screws and the
appropriate plugs for the supporting material. There is an adaptor plate for ceiling installation
(PN 6322420).

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Figure 8: Outline and Mounting Dimensions
When mounting on a pole, secure the Junction Box to a suitable mounting plate and attach the
mounting plate to the pole using U-Bolts (Pole-Mounting brackets for Teledyne Oldham
Simtronics J-box accessories are available separately).
2.6 Electrical Installation
The installation should meet all the regulations currently in force for installations in explosive
atmospheres, in particular the standards IEC/EN 60079-14 and IEC/EN 60079-17 (whichever
editions are in force) or in accordance with other national standards. OLCT 700 and OLCT 710
are certified for use in ATEX zones 1 and 2, group IIB+H2, T4.
Proper electrical installation of the gas detector is critical for conformance to Electrical Codes and
to avoid damage due to water leakage. Refer to Figure 9 and Figure 10 for proper electrical
installation.
Ground
Ground

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Figure 9: Typical Installation
NOTE: The Teledyne Oldham Simtronics Warranty does not cover water damage resulting from
water leaking into the enclosure. However, since the electronics are 100% epoxy encapsulated,
only the wire terminations could get wet. Moisture could cause abnormal operation and possibly
corrosion to the terminal connections, but permanent damage to the detector would not be
expected.
NOTE: Unused port should be blocked with the M20x1.5 male plug supplied by Teledyne
Oldham Simtronics (ATEX and ‘Ex d IIC’ certified). The engagement shall be 5 threads at least.
2.7 Field Wiring
Teledyne Oldham Simtronics OLCT 700/710 IR combustible hydrocarbon gas detector
assemblies require three conductor connections between power supplies and host electronic
controller’s 4-20mA output, and 2 conductor connections for the Modbus™ RS-485 serial
interface. Wiring designations are + (24VDC), – (0V), mA (detector signal), and Modbus™ RS-
485 A (+), and B (-). Maximum wire length between detector and 24VDC source is shown in the
Table below. Maximum wire size for termination in the Teledyne Oldham Simtronics J-Box
accessory is 14AWG.
Max loop load resistance between green and black wire (analog signal output) is 500 ohms.
Minimum loop load resistance between green and black wire is 100 ohms. This is considers wire
diameter, wire length, max operating temperature and selected termination resistor.
Unused port shall be
sealed with the « Ex d »
certified plug delivered
along with the transmitter.

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Table 1: Wire Gauge vs. Distance
AWG
Wire Dia.
Cross Section
Meters/Feet
Over-Current
Protection
22 0,65 mm 0,32 mm² 700/2080 3A
20 0,8 mm 0,5 mm² 1120/3350 5A
18 1,0 mm 0,8 mm² 1750/5250 7A
16 1,3 mm 1,3 mm² 2800/8400 10A
14 1,6 mm 2 mm² 4480/13440 20A
NOTE 1: Wiring table is based on stranded tinned copper wire and is designed to serve as a
reference only.
NOTE 2: Shielded cable is required for installations where cable trays or conduit runs include
high voltage lines or other possible sources of induced interference. Separate conduit or tray runs
are highly recommended in these cases.
NOTE 3: The supply of power should be from an isolated source with over-current protection as
stipulated in table.
2.7.1 Cable Preparation
NOTE : It is essential that the instructions provided by the manufacturer of the cable gland are
followed and the braid is correctly connected.
1 - Remove the rubber pot and the two metal
washers (A)

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2 - Arrange the cable as shown in the picture
3 – Arrange the braid as shown in the picture.
Avoid creating "pigtails"
4 - Insert the part back into the OLCT 710
2.7.2 Terminal Connections
CAUTION: Do not apply System power to the detector until all wiring is properly
terminated and openings are properly closed.
a) Remove the junction box cover. Identify the terminal blocks for customer wire connections (see
Figure 10).
NOTE : To remove the cover, tighten the locking screw before unscrewing the cover
Locking screw