Detcon IR-700 User Manual

INSTRUCTION MANUAL

Detcon Model IR-700

IR-700 Combustible Gas Sensor

0-100% LEL and 0-50% LEL range

IR-700 CO2Carbon Dioxide Gas Sensor

All Ranges

DETCON, Inc.

4055 Technology Forest Blvd.,

The Woodlands, Texas 77381

Ph.281.367.4100 / Fax [phone]

www.detcon.com

February 28, 2014 • Document #3169 • Revision 3.1

This page left intentionally blank

Model IR-700

Model IR-700 ii

Model IR-700

Table of Contents

1. Introduction ..................................................................................................................................................1

1.1 Description.......................................................................................................................................... 1

1.1.1 Non-Dispersive Infrared (NDIR) Optical Sensor Technology....................................................... 1

1.1.2 Principle of Operation .................................................................................................................... 2

1.1.3 Performance Characteristics........................................................................................................... 2

1.2 Sensor Electronics Design .................................................................................................................. 3

1.2.1 Intelligent Transmitter Module....................................................................................................... 3

1.3 Modular Mechanical Design............................................................................................................... 3

1.4 Plug-in Replaceable Sensor ................................................................................................................ 4

2. Installation....................................................................................................................................................5

2.1 ATEX Operational Guidelines for Safe Use....................................................................................... 5

2.2 Sensor Placement................................................................................................................................ 6

2.3 Sensor Contaminants and Interference ............................................................................................... 7

2.4 Mounting Installation.......................................................................................................................... 7

2.5 Electrical Installation .......................................................................................................................... 8

2.6 Field Wiring........................................................................................................................................ 9

2.7 Initial Start Up................................................................................................................................... 11

3. Operation....................................................................................................................................................12

3.1 Programming Magnet Operating Instructions................................................................................... 12

3.2 Operator Interface............................................................................................................................. 13

3.3 Normal Operation ............................................................................................................................. 14

3.4 Calibration Mode (AutoZero and AutoSpan) ................................................................................... 15

3.4.1 AutoZero....................................................................................................................................... 15

3.4.2 AutoSpan...................................................................................................................................... 15

3.5 Program Mode .................................................................................................................................. 17

3.5.1 View Sensor Status....................................................................................................................... 18

3.5.2 Set AutoSpan Level...................................................................................................................... 19

3.5.3 Set Gas Type& Range.................................................................................................................. 20

3.5.4 Set Gas Factor............................................................................................................................... 20

3.5.5 Set Serial ID ................................................................................................................................. 21

3.5.6 Set Sensor Gain ............................................................................................................................ 22

3.5.7 Signal Output Check..................................................................................................................... 22

3.5.8 Restore Factory Defaults.............................................................................................................. 23

3.6 Program Features .............................................................................................................................. 23

3.6.1 Operational Features..................................................................................................................... 24

3.6.2 Fault Diagnostic/Fail-Safe Features ............................................................................................. 24

4. RS-485 Modbus™ Protocol .......................................................................................................................27

Content Description.............................................................................................................................................27

5. Service and Maintenance............................................................................................................................29

5.1 Calibration Frequency....................................................................................................................... 29

5.2 Visual Inspection .............................................................................................................................. 29

5.3 Condensation Prevention Packet....................................................................................................... 29

5.4 Replacement of IR Plug-in Combustible Gas Sensor....................................................................... 29

5.5 Replacement of ITM......................................................................................................................... 30

5.6 Replacement of IR-700 Sensor Assembly........................................................................................ 30

6. Troubleshooting Guide...............................................................................................................................31

7. Customer Support and Service Policy........................................................................................................34

8. IR-700 Sensor Warranty.............................................................................................................................35

9. Appendix ....................................................................................................................................................36

9.1 Specifications.................................................................................................................................... 36

Model IR-700 iii

Model IR-700

9.2 Spare Parts, Sensor Accessories, Calibration Equipment ................................................................. 38

9.3 Model IR-700 Engineering Drawings............................................................................................... 39

10. Revision Log ......................................................................................................................................... 39

Table of Figures

Figure 1 Sensor Cell Construction ....................................................................................................................... 1

Figure 2 Principle of Operation............................................................................................................................ 2

Figure 3 Response Curve ..................................................................................................................................... 2

Figure 4 ITM Circuit Functional Block Diagram................................................................................................. 3

Figure 5 Sensor Assembly Front View ................................................................................................................ 3

Figure 6 Sensor Assembly Breakaway................................................................................................................. 4

Figure 7 IR Sensor Cell........................................................................................................................................ 4

Figure 8 ATEX Approval Label........................................................................................................................... 5

Figure 9 Outline and Mounting Dimensions........................................................................................................ 8

Figure 10 Typical Installation.............................................................................................................................. 9

Figure 11 Sensor Wire Connections................................................................................................................... 10

Figure 12 Magnetic Programming Tool............................................................................................................. 12

Figure 13 Magnetic Programming Switches...................................................................................................... 12

Figure 14 IR-700 Software Flowchart................................................................................................................ 14

Figure 15 Sensor Assembly................................................................................................................................ 29

List of Tables

Table 1Wire Gauge vs. Distance.......................................................................................................................... 9

Table 2 Gas Factors............................................................................................................................................ 21

Table 3 Modbus™ Registers.............................................................................................................................. 27

Table 4 Modbus™ Special Registers ................................................................................................................. 28

Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

Model IR-700 iv

Model IR-700

1. Introduction

1.1 Description

Detcon Model IR-700 combustible gas sensors are non-intrusive “Smart” sensors
designed to detect and monitor combustible hydrocarbon gases in air. The range of
detection is 0-100% LEL or 0-50% LEL. The Model IR-700 CO2Sensor is designed
to detect CO2in air at ranges from 0-.3% to 0-100% by Volume. The sensor 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 sensor 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 sensor readings and the sensor’s menu-driven
interface when the hand-held programming magnet is used.

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, Detcon 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

IR-700 Instruction Manual Rev. 3.1 Page 1 of 40

Model IR-700

NOTE:

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. 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, as shown in the response curve illustration below. 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.

The IR-700 sensor 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 IR-700 sensor 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.

Figure 3 Response Curve

IR-700 Instruction Manual Rev. 3.1 Page 2 of 40

Model IR-700

RS-4854-

20mA

Display

Pre-Amp

Power Supply

1.2 Sensor Electronics Design

1.2.1 Intelligent Transmitter Module

The Intelligent Transmitter Module (ITM) is a fully encapsulated microprocessor-based package that accepts a
plug-in field replaceable combustible gas sensor and for IR-700 CO2sensors, a plug-in replaceable CO
sensor. Circuit functions include extensive I/O circuit protection, sensor pre-amplifier, on-board power
supplies, microprocessor, LED display, magnetic programming switches, a linear 4-20mA DC output, and a
Modbus™ RS-485 output. Magnetic program switches located on either side of the LED Display are activated
via a hand-held magnetic programming tool, thus allowing non-intrusive operator interface with the ITM.
Calibration can be accomplished without declassifying the area. Electrical classifications are Class I, Division
1, Groups B C D and Class I, Zone 1, Group IIB+H2.

2

Plug-In

Sensor

Element

Micro-

Processor

Figure 4 ITM Circuit Functional Block Diagram

Program Switch #1

Splash Guard Adapter

Locking Set-Screw

detcon inc.

MODEL

IR-700

LEL Sensor

I/O

Circuit

Protection

LED Display

Program Switch #2

Analog 4-20mA Out

Modbus™ RS-485 Output

Power In

Figure 5 Sensor Assembly Front View

1.3 Modular Mechanical Design

The Model IR-700 Sensor Assembly is completely modular and made up of four parts (See Error! Reference
source not found. for Assembly Breakaway):

1) IR-700 Intelligent Transmitter Module (ITM)

2) Field Replaceable Plug-in Infra-Red Gas Sensor

IR-700 Instruction Manual Rev. 3.1 Page 3 of 40

Model IR-700

3) Model 700 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.

Plug-in Replacable

Housing Bottom

Assembly

Combustible
Hydrocarbon Sensor

Lens and LCD
Display

Splash Guard

O-Rings

Housing Bottom
Locking Set-Screw

LEL Sensor

Magnetic
Programming
Switches

detcon inc.

detcon inc.

IR-700

MODEL

Intelligent Transmitter Module (ITM)
Micro-Processor controlled circuit
encapsulated in an explosion proof
housing.

Figure 6 Sensor Assembly Breakaway

1.4 Plug-in Replaceable Sensor

The Detcon 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
Detcon IR combustible hydrocarbon gas sensor and the CO2gas sensor have an infinite shelf life, and are
supported by a 5-year pro-rated warranty. The expected service life is 5 years or greater.

Figure 7 IR Sensor Cell

IR-700 Instruction Manual Rev. 3.1 Page 4 of 40

Model IR-700

2. Installation

2.1 ATEX Operational Guidelines for Safe Use

1. Install sensor only in areas with classifications matching with those described on the ATEX approval
label. Follow all warnings listed on the label.

Figure 8 ATEX Approval Label

2. Ensure that the sensor is properly threaded into a suitable explosion-proof rated junction box with a
downward pointing female ¾” NPT threaded connection. The sensor should be threaded up at least 5
full turns until tight, with the LED display facing forward. Avoid use of Teflon Tape, or any type of
non-conductive pipe thread coating on the NPT threaded connection.

3. 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.

4. Ensure that the Housing Bottom and plug-in sensor are installed during operation. The Housing
Bottom should be 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.

5. Removal of the Housing Bottom violates the Ex d protection method and hence power must be
removed from the sensor prior its safe removal.

6. The screws holding down the retaining plate label are special fasteners of type Stainless Steel, Phillips
Pan-head Machine screw, M3 x 0.5 6g6h having yield strength of greater than 40,000 PSI, typical
80,000 PSI. If screw requires replacement, only an identical screw may be used.

7. Proper precautions should be taken during installation and maintenance to avoid the build-up of static
charge on the plastic components of the sensor. These include the splashguard and splashguard
adapter.

8. Do not operate the sensor outside of the stated operating temperature limits.

9. Do not operate the sensor outside the stated operating limits for voltage supply.

10. These sensors meet EN60079-0:2009, EN60079-1:2007.

IR-700 Instruction Manual Rev. 3.1 Page 5 of 40

Model IR-700

NOTE:

NOTE:

2.2 Sensor Placement

Selection of sensor location is critical to the overall safe performance of the product. Five factors play an
important role in selection of sensor 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.
(5) Maintenance access.

Density

Placement of sensors relative to the density of the target gas is such that sensors 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, sensor placement should be 4-8 feet above grade in open areas or in pitched
areas of enclosed spaces.

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 sensors 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 sensor 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.

In all installations the gas sensor should point straight down. Refer to Figure 10.

Improper sensor orientation may result in false readings and permanent sensor damage.

Additional Placement Considerations

The sensor should not be positioned where it may be sprayed or coated with surface contaminating substances.
Painting sensor assemblies is prohibited.

IR-700 Instruction Manual Rev. 3.1 Page 6 of 40

Model IR-700

Although the sensor is designed to be RFI resistant, it should not be mounted in close proximity to high­powered radio transmitters or similar RFI generating equipment.

When possible, mount the sensor in an area void of high wind, accumulating dust, rain, or splashing from hose
spray, direct steam releases, and continuous vibration. If the sensor cannot be mounted away from these
conditions then make sure the Detcon Harsh Environment Splashguard accessory is used.

Do not mount in locations where temperatures will exceed the operating temperature limits of the sensor.
Where direct sunlight leads to exceeding the high temperature-operating limit, use a sunshade to help reduce
temperature.

2.3 Sensor Contaminants and Interference

Detcon IR-700 combustible hydrocarbon gas sensors 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 IR-700 Combustible gas sensors there are no known cross-interference gases that are not combustible
hydrocarbon gases. For the IR-700 CO2Sensor, there are no known cross interference gases.

2.4 Mounting Installation

The IR-700 sensor assembly is designed to be threaded into a ¾” female NPT fitting of a standard cast metal
Explosion-Proof Enclosure or Junction Box. There are two wrench flats on the upper section of the sensor that
should be used to thread the sensor into the ¾” female NPT receiving connection. Thread the sensor up until
tight (5 turns is typically expected) and until the display is facing the direction that the sensor will normally be
viewed and accessed.

The IR-700 should be vertically oriented so that the sensor points straight downward. The explosion-proof
enclosure or junction box would then typically be mounted on a wall or pole. Detcon provides a standard
selection of junction boxes available as sensor accessories (See Figure 4 below), but any appropriately rated
enclosure with a downward facing ¾” NPT female connection will suffice.

When mounting on a wall, it is recommended to use a 0.25”-0.5” spacer underneath the mounting ears of the
Detcon standard J-Box to offset the sensor assembly from the wall and create open access around the sensor
assembly. Spacing requirements for other junction boxes may vary.

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 Detcon J-Box accessories are available separately.)

IR-700 Instruction Manual Rev. 3.1 Page 7 of 40

Conduit

NOTE:

NOTE:

Mounting Holes

5.5"
5"

3

" NPT Fitting

4

Plug unused ports

Model IR-700

Drain

"T"

Recommended Electrical

Installation Method

EYS Seal Fitting

3

" NPT Fitting

4

Ø0.265"

Mounting Hole

3

Explosion Proof Housing

Junction-Box

(Detcon's J-Box Shown)

" NPT Fitting

4

IR-700 Inteligent

Transmitter Module

(ITM)

Housing Bottom

Splash Guard

detconinc.

MODEL

IR-700

LEL

2.125"

4.9"
Typ.

7.2"

Typ.

2"

Figure 9 Outline and Mounting Dimensions

Ø0.265"

Mounting Hole

5.25"

8-32 Threaded
Ground Point

12.5"
Typ.

Use Spacers to move

the J-Box and Sensor

Assembly away from the

wall at least 0.25-0.5" to

allow access to Sensor

6-32 threaded

Ground Point

ITM

Bolt

Spacer

Mounting

Wall (or other

mounting surface)

2.5 Electrical Installation

The Sensor Assembly should be installed in accordance with local electrical codes. The sensor assemblies are
CSA/NRTL approved (US and Canada) for Class I, Division 1, Groups B, C, & D area classifications, and are
ATEX Approved for Class I, Zone 1, Group IIB+H2area classifications.

Proper electrical installation of the gas sensor is critical for conformance to Electrical Codes and to avoid
damage due to water leakage. Refer to Figure 10 and Figure 11 for proper electrical installation.

If a conduit run exits the secondary port, repeat the installation technique shown in

Figure 10.

In Figure 10, the drain allows H2O condensation inside the conduit run to safely drain away from the sensor
assembly. The electrical seal fitting is required to meet the National Electrical Code per NEC Article 500-3d
(or Canadian Electrical Code Handbook Part 1 Section 18-154). Requirements for locations of electrical seals
are covered under NEC Article 501-5. Electrical seals also act as a secondary seal to prevent water from
entering the wiring terminal enclosure. However, they are not designed to provide an absolute water-tight
seal, especially when used in the vertical orientation.

A conduit seal is typically required to be located within 18" of the J-Box and Sensor

Assembly. Crouse Hinds type EYS2, EYD2 or equivalent are suitable for this purpose.

IR-700 Instruction Manual Rev. 3.1 Page 8 of 40

Model IR-700

NOTE:

NOTE:

The Detcon 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 sensor would not be expected.

Conduit

"T"

Drain

Customer

Supplied Wiring

Transient Protection Module
(TPM) P/N 500-003087-100

A(+)

N/U

B(-)

(+)

(-)

mA

Mount TPM in Explosion

Proof Enclosure to ground

unit properly. Mount to

bottom of enclosure using

6-32 screws.

EYS Seal Fitting

Explosion

Proof

Junction Box

IR-700

Sensor

Assembly

6-Pin Pheonix Plug

P/N 306-175705-100

Blu

Blk

Grn

Wiring to

Wht

A(+)

B(-)

Red

(+)mA(-)

Sensor Assembly

Figure 10 Typical Installation

Plug any unused

Explosion Proof

Housing

(J-Box)

detcon inc.

MODEL

IR-700

LELSe nsor

ports

Any unused ports should be blocked with suitable ¾” male NPT plugs. Detcon
Supplies one ¾” NPT male plug with their accessory J-box enclosures. If connections are
other than ¾” NPT, use an appropriate male plug of like construction material.

2.6 Field Wiring

Detcon Model IR-700 combustible hydrocarbon gas sensor 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 + (DC), – (DC), mA (sensor signal), and
Modbus™ RS-485 A (+), and B (-). Maximum wire length between sensor and 24VDC source is shown in the
Table below. Maximum wire size for termination in the Detcon J-Box accessory is 14AWG.

Table 1Wire Gauge vs. Distance

AWG Wire Dia. Meters Feet

22 0.723mm 700 2080 3A
20 0.812mm 1120 3350 5A

IR-700 Instruction Manual Rev. 3.1 Page 9 of 40

Over-Current

Protection

18 1.024mm 1750 5250 7A

NOTE 1:

NOTE 2:

NOTE 3:

16 1.291mm 2800 8400 10A
14 1.628mm 4480 13,440 20A

Wiring table is based on stranded tinned copper wire and is designed to serve as a

reference only.

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 runs are
highly recommended in these cases.

The supply of power should be from an isolated source with over-current protection
as stipulated in table.

Terminal Connections

CAUTION: Do not apply System power to the sensor until all wiring is properly terminated.

Refer to Section 2.7Initial Start Up

Power from and 4-20mA

out to Control Device

Modbus RS-485 to

Host Control Device

Customer

Supplied Wiring (In)

(+)

(-)

mA

A(+)

B(-)

Explosion

Proof

Junction Box

Model IR-700

Customer

Supplied Wiring

(Out to next Device)

(+)
(-)
mA

A(+)
B(-)

Modbus RS-485 to

next Device

Install a 100-250 Ohm

resistor if the 4-20mA

output is not used

Blu

Blk

Grn

Red

(+)mA(-)

Wiring to

Sensor Assembly

Wht

A(+)

B(-)

Figure 11 Sensor Wire Connections

a) Remove the junction box cover. Identify the terminal blocks for customer wire connections.

b) Observing correct polarity, terminate the 3-conductor 4-20mA field wiring (+, -, mA) to the sensor

assembly wiring in accordance with the detail shown in Figure 11. If the 4-20mA output is not used, the
green wire from the sensor must be connected to the (-) terminal on the Transient Protection Module.

NOTE: If the 4-20mA output is not being used, the Green wire from the sensor m ustbe
connected to the Black wire at the (-) terminal on the Transient Protection Module to
ensure RS-485 communication is not disrupted by a 4-20mA Fault.

c) If applicable, terminate the RS-485 serial wiring as shown in Figure 11. Use the second plug (Out) as

termination point on the customer side to facilitate a continuous RS-485 serial loop

IR-700 Instruction Manual Rev. 3.1 Page 10 of 40

Model IR-700

NOTE

NOTE

The RS-485 (if applicable) requires 24 gauge, two conductor, shielded, twisted pair cable between sensor and
host controller. General Cable Commodore part number ZO16P0022189 is recommended.

: Install a 120 ohm resistor across A & B terminals on the last sensor in the serial loop.

d) Trim all exposed wire leads if they are not permanently landed in a terminal block.

e) Replace the junction box cover.

2.7 Initial Start Up

Upon completion of all mechanical mounting and termination of all field wiring, apply system power in the
range of 11.5-30 VDC (24 VDC typical) and observe the following normal conditions:

a) IR-700 display reads “0”, and no fault messages are flashing.

b) A temporary non-zero reading may occur as the sensor reaches stabilization. The reading will converge to

“0” within 1-2 minutes of power-up, assuming there is no combustible gas in the area of the sensor.

: The 4-20mA signal is held constant at 4mA for the first two minutes after power up.

Initial Operational Tests

After a warm up period of 1 hour, the sensor should be checked to verify sensitivity to combustible gas. For
the IR-700 CO2series sensors, test the sensor with a suitable CO2span gas.

Material Requirements

 Detcon PN 613-120000-700 700 Series Splash Guard with integral Cal Port –OR-
 Detcon PN 943-000006-132 Threaded Calibration Adapter
 Detcon PN 942-520124-050 Span Gas; 50% LEL methane/balance Air at fixed flow rate of 200

cc/min (for 0-100% range)

 Detcon PN 942-520124-025 Span Gas; 25% LEL methane/balance Air at fixed flow rate of 200

cc/min (for 0-50% range)

a) Attach the calibration adapter to the threaded sensor housing. Apply the test gas at a controlled flow rate

of 200cc/min. Allow 1-2 minutes for the reading to stabilize. Observe that during the 1-2 minutes the
ITM display increases to a level near that of the applied calibration gas value.

b) Remove test gas and observe that the ITM display decreases to “0”.

Initial operational tests are complete. Detcon IR-700 combustible gas sensors are factory calibrated prior to
shipment, and should not require significant adjustment on start up. However, it is recommended that a
complete calibration test and adjustment be performed 16 to 24 hours after power-up. Refer to zero and span
calibration instructions in Section 3.4.

IR-700 Instruction Manual Rev. 3.1 Page 11 of 40

Model IR-700

NOTE

3. Operation

3.1 Programming Magnet Operating Instructions

The Operator Interface of the Model 700 Series gas sensors is accomplished via two internal magnetic
switches located to either side of the LED display (see Figure 13). The two switches, labeled “PGM1” and
“PGM2”, allow for complete calibration and configuration and thereby eliminate the need for area de­classification or the use of hot permits.

Figure 12 Magnetic Programming Tool

The magnetic programming tool (Figure 12) is used to operate the magnetic switches. Switch action is defined
as momentary contact, 3-second hold, and 10-second hold. (Hold times are defined as the time from the point

when the arrow-prompt ““appears.) For momentary contact use, the programming magnet is briefly held
over a switch location. For 3-second hold, the programming magnet is held in place over the switch location
for three seconds. For 10-second hold, the programming magnet is held in place over the switch location for
10 seconds. The 3 and 10 second holds are generally used to enter calibration/program menus and save new
data. The momentary contact is generally used to move between menu items and to modify set-point values.

Arrows (“” and “”) are used on the LED display to indicate when the magnetic switches are activated.
The location of “PGM1” and “PGM2” are shown in Figure 13.

LED Display

Program Switch #2

Program Switch #1

Splash Guard Adapter

Locking Set-Screw

Figure 13 Magnetic Programming Switches

detcon inc.

MODEL

IR-700

LEL Sensor

: While in the Program Mode, if there is no magnetic switch interaction after 4

consecutive menu scrolls, the sensor will automatically revert to normal operating condition.
While changing values inside menu items, if there is no magnet activity after 3-4 seconds

the sensor will revert to the menu scroll.

IR-700 Instruction Manual Rev. 3.1 Page 12 of 40

Model IR-700

(Exception to this is with “Signal Output Check” mode.)

3.2 Operator Interface

The operating interface is menu-driven via the two magnetic program switches located under the target marks
of the sensor housing. The two switches are referred to as “PGM1” and “PGM2”. The menu list consists of
three major items that include sub-menus as indicated below. (Refer to the complete Software Flow Chart.)

Normal Operation

Current Reading and Fault Status

Calibration Mode

AutoZero
AutoSpan

Program Mode

View Sensor Status

Sensor Model Type
Current Software Version
Gas Type
Range of Detection
Serial ID address
AutoSpan Level
Days From Last AutoSpan
Remaining Sensor Life
Gas Factor
Raw Active Counts
Raw Reference Counts
4-20mA Output
Input Voltage Supply

Sensor Temperature
Set AutoSpan Level
Set Gas Type & Range
Set Gas Factor
Set Serial ID
Set Sensor Gain
Signal Output Check
Restore Default Settings

IR-700 Instruction Manual Rev. 3.1 Page 13 of 40

Normal Operation

PGM1 (3)

PGM2 (10)

View Sensor Status

Auto Time-Out

PGM1/2 (M)
PGM1/2 (3)

Model Type

PGM1 (3)
PGM2 (3)

Calibration Mode

(Auto Zero)

Calibration Mode

(Auto Span)

Set AutoSpan Level

AutoTime-out

PGM1/2 (M)

PGM1/2 (3)

Software Flowchart

Set Gas Type & Range

Auto Time-Out

PGM1/2 (M)

PGM1/2 (3)

Type ##

inc

PGM2 (S)
PGM1 (S)

PGM1/2 (3)

dec

Set Gas Factor

Auto Time-Out

PGM1/2 (M)

PGM1/2 (3)

Model IR-700

Version X.XX

Gas Type

Range XXX

Serial ID XX

AutoSpan @ XX

Last Cal XX Days

Sensor Life XXX%

Gas Factor = X.XX

Act Counts = XXXX

Ref Counts = XXXX

mA Output = XX.XX

Voltage XX.X VDC

Temp = XX C

inc

inc

##

PGM2 (S)
PGM1 (S)

PGM1/2 (3)

Set Serial ID

Auto Time-Out

PGM1/2 (M)

PGM1/2 (3)

##

PGM2 (S)
PGM1 (S)

PGM1/2 (3)

Restore Defaults

Auto Time-Out

PGM1/2 (M)

PGM2 (10)

Defaults Restored

dec

dec

Range ##

inc

PGM2 (S)
PGM1 (S)

PGM1/2 (3)

Set Sensor Gain

Auto Time-Out

PGM1/2 (M)

PGM1/2 (3)

Setting Gain

dec

LEGEND:

PGM1 - Program Switch Location #1
PGM2 - Program Switch Location #2

(S) - Momentary Swipe
(M) - Momentary hold of Magnet during text

scroll until the ">" appears, then release
(3) - 3 second hold from ">" prompt
(10) - 10 second hold from ">" prompt

Auto Time-out - 5 seconds

inc - Increase
dec - Decrease

X, XX, XXX - numeric values

inc

##

PGM2 (S)
PGM1 (S)

PGM1/2 (3)

Signal Output Check

Auto Time-Out

PGM1/2 (M)

PGM1/2 (10)

Simulation

PGM1/2 (3)

dec

Figure 14 IR-700 Software Flowchart

3.3 Normal Operation

In normal operation, the ITM Display continuously shows the current sensor reading, which will normally
appear as “0”. Once every 60 seconds the LED display will flash the sensor’s measurement units and gas type
(i.e. % LEL). If the sensor is actively experiencing any diagnostic faults, a “Fault Detected” message will
flash on the ITM display once every minute. When the unit is in “Fault Detected” mode, PGM1 or PGM2 can
be swiped to prompt the sensor to display the list of the active faults.

In normal operation, the 4-20mA current output corresponds with the present gas concentration and full-scale
range. The RS-485 Modbus™ serial output provides the current gas reading and fault status on a continuous
basis when polled.

Caution: Off-scale readings may indicate a flammable concentration of gas.

IR-700 Instruction Manual Rev. 3.1 Page 14 of 40

Model IR-700

NOTE

1

:

NOTE 2:

NOTE:

3.4 Calibration Mode (AutoZero and AutoSpan)

3.4.1 AutoZero

The AutoZero function is used to set the sensor’s zero baseline. Local ambient air can be used to zero
calibrate the sensor as long as it can be confirmed that it contains no combustible hydrocarbon gases. If this
cannot be confirmed then a zero air or pure N2 cylinder should be used. The same AutoZero procedure
applies for the CO2 version sensor.

Material Requirements:

 Detcon PN 327-000000-000 MicroSafe™ Programming Magnet
 Detcon PN 613-120000-700 700 Series Splash Guard with integral Cal Port and Calibration Wind

Guard (P/N 943-000000-000) -OR-

 Detcon PN 943-000006-132 Threaded Calibration Adapter
 Detcon PN 942-001123-000 Zero Air (or N2) cal gas, or use ambient air if no combustible gas is

present.

a) If the ambient air is known to contain no combustible hydrocarbon gas content, it can be used to calibrate

zero. If a zero air or N2 gas cal cylinder is going to be used then attach the calibration adapter and set flow
rate of 200 cc/min and let sensor purge for 1-2 minutes before executing the AutoZero.

b) From Normal Operation, enter Calibration Mode by holding the programming magnet over PGM1 for 3

seconds. Note, the “” prompt will show that the magnetic switch is activated during the 3 second hold
period. The display will then scroll “PGM1=Zero …PGM2=Span”. Hold the programming magnet over
PGM1 for 3 seconds once the “” prompt appears to execute AutoZero (or allow to timeout in 5 seconds
if AutoZero is not desired).

Upon entering Calibration Mode, the 4-20mA signal drops to 2mA and is held at this
level until the program returns to normal operation. Modbus™ Status Register bit 14 is also set
to signify when the sensor is in-calibration mode.

The Calibration Wind Guard must be used when the Splashguard Adapter with
integral Cal Port is used. Failure to use the Calibration Wind Guard may result in an inaccurate
AutoZero calibration.

c) The ITM will display the following sequence of text messages as it proceeds through the AutoZero

sequence:

Zero Cal. . .Setting Zero. . . Zero Saved (each will scroll twice)

d) Remove the zero gas and calibration adapter, if applicable.

3.4.2 AutoSpan

The AutoSpan function is used to span calibrate the sensor. Span adjustment is recommended at 50% of range
for LEL and CO2sensors. Follow the same procedure for both. The gas Factor Table (Section 3.5.4 Set Gas
Factor Table 2) should be used for Methane and for Heavy Hydrocarbon gas.

Before performing AutoSpan Calibration, verify that the AutoSpan level matches the

span calibration gas concentration as described in Section 3.5.2Set AutoSpan Level.

IR-700 Instruction Manual Rev. 3.1 Page 15 of 40

Model IR-700

NOTE

1

:

NOTE 2:

NOTE:

Material Requirements:

 Detcon PN 327-000000-000 MicroSafe™ Programming Magnet
 Detcon PN 613-120000-700 700 Series Splash Guard with integral Cal Port and Calibration Wind

Guard (P/N 943-000000-000) -OR-

 Detcon PN 943-000006-132 Threaded Calibration Adapter
 Detcon PN 942-520124-050 50% LEL Methane in balance air (recommended for 0-100% LEL range),

or

 Detcon PN 942-520124-025 25% LEL Methane in balance air (recommended for 0-50% LEL range),

or other suitable span gas containing a certified level of % LEL concentration of common combustible
hydrocarbon gas.

If the span gas is different from the measured target gas, remember to use the

appropriate Gas Factor as described in Section 3.5.4.

The Calibration Wind Guard must be used when the Splashguard Adapter with
integral Cal Port is used. Failure to use the Calibration Wind Guard may result in an inaccurate
AutoSpan calibration.

CAUTION: Verification that the calibration gas level setting matches the calibration span gas
concentration is required before executing “AutoSpan” calibration. These two numbers must be equal.

AutoSpan consists of entering Calibration Mode and following the menu-displayed instructions. The display
will ask for the application of span gas in a specific concentration. This concentration must be equal to the
calibration gas level setting. The factory default setting and recommendation for span gas concentration is
50% of the sensor’s range. If a span gas containing the recommended concentration is not available, other
concentrations may be used as long as they fall between 5% and 95% of the sensor’s range. However, any
alternate span gas concentration value must be programmed via the “Set AutoSpan Level” menu before
proceeding with AutoSpan calibration. Follow the instructions “a” through “e” below for AutoSpan
calibration.

a) Verify that the AutoSpan Level is equal to the calibration span gas concentration. (Refer to View Sensor

Status in Section 3.5.1.) If the AutoSpan Level is not equal to the calibration span gas concentration,
adjust the AutoSpan Level as instructed in Section 3.5.2Set AutoSpan Level.

b) From Normal Operation, enter Calibration Mode by holding the programming magnet over PGM1 for 3

seconds. Note, the “” prompt will show that the magnetic switch is activated during the 3 second hold
period. The display will then scroll “PGM1=Zero . . . PGM2=Span”. Hold the programming magnet over
PGM2 for 3 seconds to execute AutoSpan (or allow to timeout in 5 seconds if AutoSpan is not intended).
The ITM will then scroll “Apply XX %LEL Gas” (where XX is the AutoSpan Level).

Upon entering Calibration Mode, the 4-20mA signal drops to 2mA and is held at this
level until the program returns to normal operation. Modbus™ Status Register bit 14 is also set
to signify when the sensor is in-calibration mode.

c) Apply the span calibration test gas at a flow rate of 200cc/min. As the sensor signal begins to increase the

display will switch to reporting a flashing “XX” reading as the ITM shows the sensor’s “as found”
response to the span gas presented. If it fails to meet the minimum in-range signal change criteria within
2½ minutes, the display will report “Range Fault” twice and the ITM will return to normal operation,
aborting the AutoSpan sequence. The ITM will continue to report a “Range Fault” and will not clear the
fault until a successful AutoSpan is completed.

IR-700 Instruction Manual Rev. 3.1 Page 16 of 40

Model IR-700

NOTE 1

“Range Fault”

NOTE 2

“Stability Fault”

NOTE 3

Clearing Fault

Assuming acceptable sensor signal change, after 1 minute the reading will auto-adjust to the programmed
AutoSpan level. During the next 30 seconds, the AutoSpan sequence checks the sensor for acceptable reading
stability. If the sensor fails the stability check, the reading is re-adjusted back to the AutoSpan level and the
cycle repeats until the stability check is passed. Up to three additional 30-second stability check periods are
allowed before the unit reports a “Stability Fault” twice and the ITM will return to normal operation, aborting
the AutoSpan sequence. The ITM will continue to report a “Stability Fault” and will not clear the fault until a
successful AutoSpan is completed.

If the sensor passes the stability check, the ITM reports a series of messages:
“AutoSpan Complete”
“Sensor Life XXX%”
“Remove Span Gas”

d) Remove the span gas and calibration adapter. The ITM will report a live reading that alternates with

“Remove Gas” message as it clears toward “0”. When the reading clears below 5 % LEL, the ITM will
display “Span Complete” and will revert to normal operation. If the sensor fails to clear to less than 5 %
LEL in less than 5 minutes, a “Clearing Fault” will be reported twice and the ITM will return to normal
operation, aborting the AutoSpan sequence. The ITM will continue to report a “Clearing Fault” and will
not clear the fault until a successful AutoSpan is completed.

: If the sensor fails the minimum signal change criteria, a

will be
declared and a “Fault Detected” message will be displayed alternately with the sensor’s current
reading. The 4-20 output will be taken to 0mA and the “Range Fault” fault bit will be set on
the Modbus output.

: If the sensor fails the stability criteria, a

will be declared and a
“Fault Detected” message will be displayed alternately with the sensor’s current reading. The
4-20mA output will be taken to 0mA and the “Stability Fault” fault bit will be set on the
Modbus output.

: If the sensor fails the clearing time criteria, a “

” will be declared and a

“Fault Detected” message will be displayed alternately with the sensor’s current reading. The
4-20 output will be taken to 0mA and the “Clearing Fault” fault bit will be set on the Modbus
output.

3.5 Program Mode

Program Mode provides a View Sensor Status menu to check operational and configuration parameters.
Program Mode also provides for adjustment of the AutoSpan Level, Gas Factor, Gas Type and Range, and
Serial ID. Additionally, it includes the Set Sensor Gain, Restore Factory Defaults, and Signal Output Check
diagnostic functions.

The Program Mode menu items appear in the order presented below:

View Sensor Status
Set AutoSpan Level
Set Gas Type and Range
Set Gas Factor
Set Serial ID
Set Sensor Gain
Signal Output Check

IR-700 Instruction Manual Rev. 3.1 Page 17 of 40

Model IR-700

Restore Defaults

Navigating Program Mode

From Normal Operation, enter Program Mode by holding the magnet over PGM2 for 10 seconds. Note, the
“” prompt will show that the magnetic switch is activated during the 10 second hold period. The ITM will
enter Program Mode and the display will scroll the first menu item “View Sensor Status”. To advance to the
next menu item, hold the magnet over PGM1 or PGM2 while the current menu item’s text is scrolling. At the
conclusion of the text scroll the “”prompt (“” for PGM2 or “” for PGM1) will appear, and immediately
remove the magnet. The ITM will advance to the next menu item. Repeat this process until the desired menu
item is displayed. Note, PGM1 moves the menu items from right to left and PGM2 moves the menu items
from left to right.

To enter a menu item, hold the magnet over PGM1 or PGM2 while the menu item is scrolling. At the
conclusion of the text scroll the “”prompt (“” for PGM2 or “” for PGM1) will appear, continue to hold
the magnet over PGM1 or PGM2 for an additional 3-4 seconds to enter the selected menu item. If there is no
magnet activity while the menu item text is scrolling (typically 4 repeated text scrolls), the ITM will
automatically revert to Normal Operation.

3.5.1 View Sensor Status

View Sensor Status displays all current configuration and operational parameters including: sensor type,

software version number, detection range, AutoSpan level, days since last AutoSpan, estimated remaining
sensor life, gas factor, gas type, input voltage, 4-20 output, active counts, reference counts, and sensor ambient
temperature.

From the View Sensor Status text scroll, hold the magnet over PGM1 or PGM2 until the “” prompt appears
and continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll “Status
Is”). The display will scroll the complete list of sensor status parameters sequentially:

Sensor Model Type

The menu item appears as: “Model IR-700”

Current Software Version

The menu item appears as: “Version 1.XX”

Gas Type

The menu item appears as: “Gas Type = CH4”

Range of Detection

The menu item appears as: “Range XXX”

Serial ID Address

The menu item appears as: “Serial ID XX”

AutoSpan Level.

The menu item appears as: “Auto Span Level XX”

IR-700 Instruction Manual Rev. 3.1 Page 18 of 40

Days From Last AutoSpan

The menu items appears as: “Last Cal XX days”

Remaining Sensor Life

The menu item appears as: “Sensor Life 100%”

Gas Factor

The menu item appears as: “Gas Factor = X.XX”

Raw Active Counts

The menu item appears as: “Active Counts XXXX”

Raw Reference Counts

The menu item appears as: “Reference Counts XXXX”

4-20mA Output

The menu item appears as: “mA Output X.XX mA”

Model IR-700

Input Voltage Supply

The menu item appears as: “Voltage XX.X VDC”

Sensor Operating Temperature

The menu item appears as: “Temp XX C”

When the status list sequence is complete, the ITM will revert to the “View Sensor Status” text scroll. The
user can either: 1) review list again by executing another 3-4 second hold, 2) move to another menu item by
executing a momentary hold over PGM1 or PGM2, or 3) return to Normal Operation via automatic timeout of
about 15 seconds (the display will scroll “View Sensor Status” 4 times and then return to Normal Operation).

3.5.2 Set AutoSpan Level

Set AutoSpan Level is used to set the span gas concentration level that is being used to calibrate the sensor.

This level is adjustable from 5% to 95% of range (100% LEL range or CO2) or 2% to 50% (50% LEL range).
The current setting can be viewed in View Program Status.

The menu item appears as: “Set AutoSpan Level”.

From the Set AutoSpan Level text scroll, hold the magnet over PGM1 or PGM2 until the “” prompt appears
and continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll “Set
Level”). The display will switch to “XX“(where XX is the current gas level). Swipe the magnet momentarily
over PGM2 to increase or PGM1 to decrease the AutoSpan Level until the correct level is displayed. When
the correct level is achieved, hold the magnet over PGM1 or PGM2 for 3-4 seconds to accept the new value.
The display will scroll “Level Saved”, and revert to “Set AutoSpan Level” text scroll.

Move to another menu item by executing a momentary hold, or return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set AutoSpan Level” 4 times and then return to Normal
Operation).

IR-700 Instruction Manual Rev. 3.1 Page 19 of 40

Model IR-700

NOTE:

NOTE 1:

NOTE 2:

NOTE 1:

NOTE 2:

NOTE

3

:

NOTE:

3.5.3 Set Gas Type& Range

The IR sensor has a slightly different linearization requirement for different groupings of target gases. The
four groupings are 1) Methane (CH4) and 2) Heavier Hydrocarbons (H HC) and 3) % by volume (%VOL) and

4) CO2. The Set Gas Type menu function is a simple choice between these four gas type groupings.

The default value for Gas Type is methane (CH4).

The gas type and range on the 0-50% LEL range version cannot be changed. When

entering the Set Gas Type & Range menu, the sensor will display “Range is fixed”.

The menu item appears as: “Set Gas Type”.
From the Set Gas Type & Range text scroll, hold the magnet over PGM1 or PGM2 until the “” prompt

appears and continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll
“CH4 / H HC / %VOL / CO2”). Swipe the magnet momentarily over PGM2 or PGM1 to change the selection
until the correct choice is displayed. Hold the magnet over PGM1 or PGM2 for 3 seconds to accept the new
value. The display will scroll “Type Saved”, then “Set Range” followed by the currently selected Range.
Momentarily hold the magnet over PGM1 or PGM2 to change the Range Selection until the correct value is
displayed. Hold the magnet over PGM1 or PGM2 for 3 seconds to accept the new value.

If a gas type of CH4, HHC, or %VOL is selected the range can only be set to 100. If

CO2 gas type is selected range selections are 0.3, 0.5, 1, 3, 5, 10, 15, 20, 25, 50, and 100.

For CO2there are two different plug-in IR sensors. One sensor is used for the ranges
of 0.3, 0.5, 1, 3, and 5. The second is used for the rages of 10, 15, 20, 25, 50, and 100. These
sensors cannot be mismatched.

Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set Gas Type and Range” 4 times and then return to
Normal Operation).

3.5.4 Set Gas Factor

Because of the IR sensor’s almost universal response to combustible hydrocarbon gases, the IR-700 sensor can
be configured and calibrated to detect any of the combustible gases listed in the Table 2 and others not shown.
The detected gas is referred to as the “target gas” and the span calibration gas is referred to as the “cal gas”. In
cases where the cal gas is different from the target gas, the Set Gas Factor menu function is used to maintain
accuracy. This feature allows for a significant degree of flexibility in the detection and span calibration
process.

The default value for Gas Factor is 1.0. This would be used when the target gas is
the same as the cal gas. Values other than 1.0 would be used when the target gas is different
from the cal gas.

Table 2: Gas Factors can be used for both selections of “gas type = CH4” and “gas
type = HHC-Heavy Hydrocarbons”.

The “Set Gas Factor” is not applicable for CO2 versions and should be set to 1.0

IR-700 Instruction Manual Rev. 3.1 Page 20 of 40

Model IR-700

Set Gas Factor is used to make the appropriate signal sensitivity adjustment when the target gas is different
from the cal gas. This is necessary because the IR sensor has different signal strengths for each combustible
hydrocarbon gas. The Gas Factor value is adjustable from 0.2 to 5.0. It represents the translation between the
target gas and the cal gas when they are different.

To calculate the correct Gas Factor, refer to Table 2 and take the Gas Factor of the target gas and divide by the
Gas Factor of the cal gas. The calculated value is the correct number to enter into the menu as the Gas Factor.

For example, if calibrating with methane when propane is the target gas, the correct Gas Factor to enter would
be 0.63/1.0 = 0.63.

For example, if calibrating with butane when ethane is the target gas, the correct Gas Factor to enter would be

0.38/0.72=0.53.
Table 2 shows the Gas Factors of most combustible hydrocarbon gases that will be measured. Find the gas of

interest for the cal gas and the target gas and follow the above instruction. If there is a mixture of target gases,
use a weighted approach to determine the correct Gas Factor. For example, if the target gas was 50% butane
and 50% pentane and the cal gas was methane, the correct Gas Factor would be calculated and entered as ((0.5
x 0.77) + (0.5 x 0.77)) / 1.0 = 0.77.

Table 2 Gas Factors

Gas Factor Gas Factor Gas Factor

Acetic Acid 2.00 Decane 1.53 Naphthalene
Acetone 1.21 Ethyl Alcohol 0.35 n-Nonane 1.53
Benzene 1.00 Ethane 0.38 n-Octane 1.34
1,3-Butadiene 1.80 Ethyl Benzene 1.07 n-Pentane 0.77
Butane 0.77 Ethylene 2.39 Propane 0.63
Iso-Butane 0.72 n-Heptane 0.98 iso-Propyl Alcohol 0.54
Butene-1 0.67 n-Hexane 1.00 Propylene 0.80
n-Butyl Alcohol 0.63 Dimethyl Ether 0.40 Toluene 1.00
iso-Butyl Alcohol 0.63 Methane 1.00 Vinyl Acetate 1.43
Cyclohexane 0.89 Methanol 0.41 Vinyl Chloride
Cyclopropane 0.45 Methyl Ethyl Ketone 0.77 Xylene 1.00

The menu item appears as: “Set Gas Factor”.

From the Set Gas Factor text scroll, hold the magnet over PGM1 or PGM2 until the “” prompt appears and
continue to hold the magnet in place for an additional 3-4 seconds (until the display starts to scroll “Set
Factor”). The display will then switch to “X.XX“(where X.XX is the current gas factor). Swipe the magnet
momentarily over PGM2 to increase or PGM1 to decrease the gas factor level until the correct value is
displayed. Hold the magnet over PGM1 or PGM2 for 3 seconds to accept the new value. The display will
scroll “Factor Saved”, and revert to “Set Gas Factor” text scroll.

Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set Gas Factor” 4 times and then return to Normal
Operation).

3.5.5 Set Serial ID

Detcon Model IR-700 sensors can be polled serially via RS-485 Modbus™ RTU. Refer to Section 4.0 for
details on using the Modbus output feature.

IR-700 Instruction Manual Rev. 3.1 Page 21 of 40

Model IR-700

NOTE:

Set Serial ID is used to set the Modbus serial ID address. It is adjustable from 01 to 256 in hexadecimal

format (01-FF hex). The current serial ID can be viewed in View Sensor Status using the instruction given in
Section 3.5.1 View Sensor Status.

The menu item appears as: “Set Serial ID”.

From the “Set Serial ID” text scroll, hold the programming magnet over PGM1 or PGM2 until the “”
prompt appears and continue to hold the magnet in place for an additional 3-4 seconds (until the display starts
to scroll “Set ID”). The display will then switch to “XX“(where XX is the current ID address). Swipe the
magnet momentarily over PGM2 to increase or PGM1 to decrease the hexadecimal number until the desired
ID is displayed. Hold the magnet over PGM1 or PGM2 for 3-4 seconds to accept the new value. The display
will scroll “ID Saved”, and revert to “Set Serial ID” text scroll.

Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Set Serial ID” 5 times and then return to Normal
Operation).

3.5.6 Set Sensor Gain

Each Detcon IR-700 combustible hydrocarbon gas sensor requires a one-time gain setting to match the plug-in
IR sensor with the ITM electronics. This is set automatically during the “Set Sensor Gain” sequence. The
“Set Sensor Gain” sequence determines the required gain resistance setting for optimal operation. This
technique provides for uniformity in sensor-to-sensor operational performance.

The “Set Sensor Gain” function is executed during factory calibration of every IR-700
sensor. In the field, this menu item is only needed when a replacement plug-in IR sensor is
being installed, or when mating a new IR-700 ITM with an existing plug-in sensor. It is also
required if the Restore Defaults menu item is executed.

The menu item appears as: “Set Sensor Gain”.

From the Set Sensor Gain text scroll, hold the magnet over PGM1 or PGM2 until the “” prompt appears
and then hold continuously for an additional 3 seconds. The display will scroll “Setting Gain” and then show
the count-up of the gain settings for the active and reference detectors. The typical final values are A = 9 and
R = 37. At conclusion, the ITM will display “Gain Complete” and revert to “Set Sensor Gain” text scroll.

The user can then choose to either: 1) move to another menu item by executing a momentary hold, or 2) return
to Normal Operation via 5 second automatic timeout.

3.5.7 Signal Output Check

Signal Output Check provides a simulated 4-20mA output and RS-485 Modbus™ output. This simulation

allows the user to conveniently perform a functional system check of their entire safety system. This signal
output simulation also aids the user in performing troubleshooting of signal wiring problems.

The menu item appears as: “Signal Output Check”.

From the “Signal Output Check” text scroll, hold the magnet over PGM1 or PGM2 until the “” prompt
appears and then hold continuously for an additional 10 seconds. Once initiated, the display will scroll
“Simulation Active” until the function is stopped. During simulation mode, the 4-20mA value will be
increased from 4.0mA to 20.0mA (in 1% of range increments at about a 1 second update rate) and then
decreased from 20.0mA to 4.0mA. The same simulation sequence is applied to the Modbus™ output gas
reading.

IR-700 Instruction Manual Rev. 3.1 Page 22 of 40

Model IR-700

NOTE

NOTE

NOTE

: Signal Output Check stays active indefinitely until the user stops the function. There

is no automatic timeout for this feature.

To end simulation mode, hold magnet over PGM1 or PGM2 for 3 seconds. The display will either move to the
prior menu item or move to the next menu item respectively.

Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds.

3.5.8 Restore Factory Defaults

Restore Factory Defaults is used to clear current user configuration and calibration data from memory and

revert to factory default values. This may be required if the settings have been configured improperly and a
known reference point needs to be re-established to correct the problem.

This menu item appears as: “Restore Defaults”.

: “Restoring Factory Defaults” should only be used when absolutely necessary. All
previously existing configurational inputs will have to be re-entered if this function is executed.
A full 10-second magnet hold on PGM 2 is required to execute this function.

From the “Restore Defaults” text scroll, hold the programming magnet over PGM2 until the “” prompt
appears and continue to hold 10 seconds. The display will scroll “Restoring Defaults”, and then will revert to
the “Restore Defaults” text scroll.

Move to another menu item by executing a momentary hold, or, return to Normal Operation via automatic
timeout of about 15 seconds (the display will scroll “Restore Defaults” 4 times and then return to Normal
Operation).

Following the execution of “Restore Defaults”, the IR-700 will revert to its factory default settings. The
default settings are:

 Serial ID = 01. The Serial ID must be set appropriately by the operator (Section 3.5.5).

: The following must be performed in order before the sensor can be placed in operation.

 AutoSpan Level = 50 %LEL. AutoSpan level must be set appropriately by the operator (Section 3.5.2).
 Gas Type = CH4. The Gas Type must be set appropriately by the operator (Section 3.5.3).
 Gas Factor = 1.0. The Cal Factor must be set appropriately by the operator (Section 3.5.4).
 Sensor Gain: Sensor gain settings are lost. Sensor Gain must be performed (Section 3.5.6).
 AutoZero: AutoZero Calibration Settings are lost. AutoZero must be performed (Section 3.4).
 AutoSpan: AutoSpan Calibration Settings are lost. AutoSpan must be performed (Section 3.4).

3.6 Program Features

Detcon IR-700 gas sensors incorporate a comprehensive set of diagnostic features to achieve Fail-Safe
Operation. These Operational features and Failsafe Diagnostic features are detailed below.

IR-700 Instruction Manual Rev. 3.1 Page 23 of 40

Model IR-700

NOTE 1

NOTE 2

3.6.1 Operational Features

Over-Range

When gas greater than the full-scale range is detected, the ITM display will continuously flash the full-scale
reading of 100. This designates an over-range condition. The 4-20mA signal will report a 22mA output
during this time.

Negative Drift

In cases where the sensor may drift negative, the display will show a negative reading between 5% and 10% of
the sensors full scale range. I.E., if a 0-100ppm sensor drifts to negative 6 the display will indicate -6. In
cases where the full scale range of the sensor is less than 10ppm, due to the limited space on the display, the
decimal point will be displayed as an asterisk (*) to denote a negative reading. I.E., if a 0-5ppm sensor drifts
to negative 0.32 the display will show 0*32.

In-Calibration Status

When the sensor is engaged in AutoZero or AutoSpan calibration, the 4-20mA output signal is taken to 2.0mA
and the in-calibration Modbus™ Status Register bit 14 is set. This alerts the user that the ITM is not in an
active measurement mode. This feature also allows the user to log the AutoZero and AutoSpan events via
their master control system.

Sensor Life

Sensor Life is calculated after each AutoSpan calibration and is reported as an indicator of remaining service
life. It is reported in the “View Sensor Status” menu and as a RS-485 Modbus register bit. Sensor Life is
reported on a scale of 0-100%. When Sensor Life falls below 25%, the sensor cell should be replaced within a
reasonable maintenance schedule.

Last AutoSpan Date

This reports the number of days that have elapsed since the last successful AutoSpan. This is reported in the
View Sensor Status menu.

3.6.2 Fault Diagnostic/Fail-Safe Features

Fail-Safe/Fault Supervision

Model IR-700 MicroSafe™ sensors are designed for Fail-Safe operation. If any of the diagnostic faults listed
below are active, the ITM Display will scroll the message “Fault Detected” every 30 seconds during normal
operation. At any time while the “Fault Detected” message is active, swipe the magnet over PGM1 or PGM2
to display the active fault(s). All active faults will then be reported sequentially.

Most fault conditions result in failed operation of the sensor and in those cases the 4-20mA signal is dropped
to the universal fault level of 0mA. These include Zero Fault, AutoSpan Calibration Faults, Sensor Fault,
Processor Fault, Memory Fault, Loop Fault, and Input Voltage Fault. The 0mA fault level is not employed for
a Temperature Fault and AutoSpan Reminder Fault. For all diagnostic faults, the associated RS-485
Modbus™ fault register will be flagged to alert the user digitally.

: Refer to the Troubleshooting Guide section d) for guidance on fault conditions.

: The 0mA fault level is not employed for a Temperature Fault and AutoSpan

Reminder Fault.

IR-700 Instruction Manual Rev. 3.1 Page 24 of 40

Model IR-700

Zero Fault

If the sensor drifts below –10% LEL, the “Zero Fault” will be declared. A “Zero Fault” will cause a “Fault
Detected” message to scroll once a minute on the ITM display and drop the 4-20mA output to 0mA. The
Modbus™ fault register bit for Zero Fault will be set and will not clear until the fault condition has been
cleared. The sensor should be considered “Out-of-Service” until a successful AutoZero calibration is
performed.

Range Fault – AutoSpan

If the sensor fails the minimum signal change criteria during AutoSpan sequence (Section 3.4.2) the “Range
Fault” will be declared. A “Range Fault” will cause a “Fault Detected” message to scroll once a minute on the
ITM display and drop the 4-20mA output to 0mA. The Modbus™ fault register bit for Range Fault will be set
and will not clear until the fault condition has been cleared. The sensor should be considered “Out-of-Service”
until a successful AutoSpan calibration is performed.

Stability Fault – AutoSpan

If the sensor fails the signal stability criteria during AutoSpan sequence (Section 3.4.2) the “Stability Fault”
will be declared. A “Stability Fault” will cause a “Fault Detected” message to scroll once a minute on the ITM
display and drop the milliamp output to 0mA. The Modbus™ fault register bit for Stability Fault will be set
and will not clear until the fault condition has been cleared. The sensor should be considered as “Out-of­Service” until a successful AutoSpan calibration is performed.

Clearing Fault – AutoSpan

If the sensor fails the signal stability criteria during AutoSpan sequence (Section 3.4.2) the “Clearing Fault”
will be declared. A “Clearing Fault” will cause a “Fault Detected” message to scroll once a minute on the
ITM display and drop the milliamp output to 0mA. The Modbus™ fault register bit for Clearing Fault will be
set and will not clear until the fault condition has been cleared. The sensor should be considered as “Out-of­Service” until a successful AutoSpan calibration is performed.

Sensor Fault

If the plug-in IR sensor, or the supporting electronics, fails to meet the required minimum or maximum
working signal parameters a “Sensor Fault” will be declared. A “Sensor Fault” will cause a “Fault Detected”
message to scroll once a minute on the ITM display. The Modbus™ fault register bit for Sensor Fault will be
set and will not clear until the fault condition has been cleared. If a Sensor Fault occurs, the 4-20mA signal
will be set at 0mA until the fault condition is resolved.

Processor Fault

If the detector has any unrecoverable run-time errors, a “Processor Fault” is declared. A “Processor Fault”
will cause a “Fault Detected” message to scroll once a minute on the ITM display. The Modbus™ fault
register bit for Processor Fault will be set and will not clear until the fault condition has been cleared. If a
Processor Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.

Memory Fault

If the detector has a failure in saving new data to memory, a “Memory Fault” is declared. A “Memory Fault”
will cause the “Fault Detected” message to scroll once a minute on the ITM display. The Modbus™ fault
register bit for Memory Fault will be set and will not clear until the fault condition has been cleared. If a
Memory Fault occurs, the 4-20mA signal will be set at 0mA until the fault condition is resolved.

IR-700 Instruction Manual Rev. 3.1 Page 25 of 40

Model IR-700

4-20mA Loop Fault

If the sensor detects a condition where the 4-20mA output loop is not functional (high loop resistance or failed
circuit function) a “4-20mA Fault” is declared. A “4-20mA Fault” will cause the “Fault Detected” message to
scroll once a minute on the ITM display. The Modbus™ fault register bit for Loop Fault will be set and will
not clear until the fault condition has been cleared. If a Loop Fault occurs, the 4-20mA signal will be set at
0mA until the fault condition is resolved. If the 4-20mA current loop is still out of tolerance, contact Detcon
at [e-mail], or contact Detcon customer service.

NOTE: If the 4-20mA output is not being used, the Green wire from the sensor m ustbe
connected to the Black wire at the (-) terminal on the Transient Protection Module to
ensure RS-485 communication is not disrupted by a 4-20mA Fault.

Input Voltage Fault

If the detector is currently receiving an input voltage that is outside of the 11.5-28 VDC range, an “Input
Voltage Fault” is declared. An “Input Voltage Fault” will cause the “Fault Detected” message to scroll once a
minute on the ITM display. The fault register bit for Input Voltage Fault will be set and will not clear until the
fault condition has been cleared. If an Input Voltage Fault occurs, the 4-20mA signal will be set at 0mA until
the fault condition is resolved.

Temperature Fault

If the detector is currently reporting an ambient temperature that is outside of the –40C° to +75C° range a
“Temperature Fault” is declared. A “Temperature Fault” will cause the “Fault Detected” message to scroll
once a minute on the ITM display. The Modbus™ fault register bit for Temperature Fault will be set and will
not clear until the fault condition has been cleared. If a Temperature Fault occurs, the 4-20mA signal remains
operational.

AutoSpan Reminder Fault

If 180 days has elapsed since the last successful AutoSpan, an AutoSpan Fault will be generated. An
“AutoSpan Fault” will cause the “Fault Detected” message to scroll once a minute on the ITM display. The
Modbus™ fault register bit for AutoSpan Reminder Fault will be set and will not clear until the fault condition
has been cleared. If an AutoSpan Reminder Fault occurs, the 4-20mA signal remains operational.

IR-700 Instruction Manual Rev. 3.1 Page 26 of 40

Model IR-700

3,2

40003

4,2

5

4. RS-485 Modbus™ Protocol

Model DM-700 sensors feature Modbus™ compatible communications protocol and are addressable via the
program mode. Other protocols are available. Contact the Detcon factory for specific protocol requirements.
Communication is two wire, half duplex 485, 9600 baud, 8 data bits, 1 stop bit, no parity, with the sensor set
up as a slave device. A master controller up to 4000 feet away can theoretically poll up to 256 different
sensors. This number may not be realistic in harsh environments where noise and/or wiring conditions would
make it impractical to place so many devices on the same pair of wires. If a multi-point system is being
utilized, each sensor should be set for a different address. Typical address settings are: 01, 02, 03, 04, 05, 06,
07, 08, 09, 0A, 0B, 0C, 0D, 0E, 0F, 10, 11…etc.

Sensor RS-485 ID numbers are factory default to 01. These can be changed in the field via the Operator
Interface described in Section 3.5.5 Set Serial ID.

The following section explains the details of the Modbus™ protocol that the DM-700 sensor supports.

Code 03 - Read Holding Registers is the only code supported by the transmitter. Each transmitter contains 6
holding registers which reflect its current status.

Table 3 Modbus™ Registers

FC REG Content Description R/W Content Definition

03 40000 Device Type R 8 700 Sensor
030640001

40001

03 40002 Read Concentration

030640003

03 40004 Read Sensor Life R 85 For 85% sensor life
03 40005 Read Fault Status Bits

03 40006 Read Model # R 1, 2, 3, 4, 5 DM, FP, IR, TP, PID

03 40007 Read Days Since Cal R 29 29days
03 40008 4-20 Current Output

03 40009 Read Input Voltage

03 40010 Read Temperature R 28 28 °C

03/0640011 Special #1 R/W Function dependent on value of

IR-700 Instruction Manual Rev. 3.1 Page 27 of 40

Read Detectable

Write Detectable Range

Read AutoSpan Level

Write AutoSpan Level

1,2

Range

mA x100

V x100

R/W 100

R 1000 Bound by range. If > range, this

R/W 50 Span gas at 50 DM – 1% to 95% of Range (40001)

R 0x0001

R 400 4.00mA

R 2400 24.00V

Value Meaning Range

10000

0x0002
0x0004
0x0008
0x0010
0x0020
0x0040
0x0080
0x0100
0x0200
0x0400
0x0800
0x1000
0x2000
0x4000
0x8000

For 0-100
For 0-10000

value is in fault.

Global Fault
Auto Span Fault
Temperature Fault
4-20mA Fault
Input Voltage Fault
Memory Fault
Processor Fault
Clearing Fault
Stability Fault
Range Fault
Sensor Fault
Zero Fault
Sensor Fault 2
<reserved>
In Calibration
Communication Error

respectively

40006 (See Special Register

2

Table 4)

DM – 0 to 10000
FP – Read only
TP – 20, 50, 100, 200
IR – 0 to 10000
PI – 0 to 10000

FP – 5% to 95% of Range (40001)
TP – 2% to 50% of Range (40001)
IR – 5% to 95% of Range (40001)
PI – 1% to 95% of Range (40001)

Range

Model IR-700

6

6

6

6

6

6

1

(R/W)

(R/W)

(R/W)

FC REG Content Description R/W Content Definition

Value Meaning Range

03/0640012 Special #2 R/W Function dependent on value of

40006 (See Special Register

Table 4)

03 40013 Special #3 R Function dependent on value of

40006 (See Special Register

Table 4)

03/0640014 Special #4 R/W Function defendant on value of

40006 (See Special Register

Table 4)

030640015

40015

Calibration Status

Calibration Enable

RW0x0000

0x0001
0x0002
0x0003
0x0004
0x0001
0x0002
0x0008
0x0009
0x000A
0x000B

Idle
Zero Calibration Started
Span Calibration Started
Span Set
Span Calibration Unsuccessful
Set Zero
Set Span
Signal simulation mode
Set FP Bridge Voltage
Set TP Heater Power
Set IR Gain

03 40016 Read Text 1, first char inLR Two Char of Gas/Units String

03 40017 Read Text 2 R Two Char of Gas/Units String
03 40018 Read Text 3 R Two Char of Gas/Units String
03 40019 Read Text 4 R Two Char of Gas/Units String
03 40020 Read Text 5, last char inHR Two Char of Gas/Units String

03 40021 Text null terminator in L R Two Char of Gas/Units String

1

Integer ranges from 1 all the way to 10,000.

2

Units are determined by “units” field in the “notation” string

3

Gas Reading times one (x 1) with units in notation string for “Low Range” = 0. Gas Reading times one (x 10) with units in notation string for “Low

Range” = 1. Gas Reading times one (x 100) with units in notation string for “Low Range” = 2.

4

Span Gas must be less than or equal to Detectable Range and is usually about ½ of it.

5

Fault status bits self-reset when fault clears

6

Text in ASCII, in order L byte, H byte, L byte… See field descriptions of notation string.

Gas/Units String

Character # 1 2 3 4 5 6 7 8 9 10 11

Description Units 0x20 Gas Type 0x00

Units – This field is ‘PPM’, ‘PPB’, or ‘_ _ %’ (where ‘ _ ‘ is a space, 0x20).
0x20 – The units filed is terminated with an ASCII space (0x20)

Gas Type – This field contains the gas type of the cell. Any ASCII string is permissible
0x00 – The notation string is terminated with an ASCII null character

Table 4 Modbus™ Special Registers

REG DM (40006 = 1) FP (40006 = 2) IR (40006 = 3) TP (40006 = 4)

40011 Low Range= 0, 1, 2

0: Range >25 (0 decimal place)
1: Range 10-25 (1 decimal place)
2: Range <10 (2 decimal place)

40012 0x8XXX

0x0XXX
0xX000
0xX096
0xX0C8
0xX12C

Positive Polarity Cell
Negative Polarity Cell
Bias = 0mV
Bias = 150mV
Bias = 200mV
Bias = 300mV

40013 Gain Code

(integer between 0 & 15)

40014 Raw Counts 0-0xFFFF

1

Only possible ranges are 20, 50, 100, 200. Modbus register 40001 will contain either 20, 50, 100, or 200, range divisor is not necessary.

(0x8000 = nominal 0)

Gas Factor

Range = 79 to 565

Cal Factor

Range = 79 to 565

Gas Factor

Range = 20 to 565

Heater Power
(mW) (R/W)

Active Counts Heater Voltage

(mV)

Bridge Current (mA) Reference Counts Sensor Resistance

(x100 Ω)

Bridge Voltage (mV)

(Read only)

Range Divisor
1,10,100, or 1000

Heater Current
(mA )

Low Range= 0, 1, 2
0: Range >25
1: Range 10-25
2: Range <10
0x8XXX
0x0XXX
0xX000
0xX096
0xX0C8
0xX12C

Gain Code

Raw Counts

IR-700 Instruction Manual Rev. 3.1 Page 28 of 40

PI (40006 = 5)

Positive Polarity
Cell
Negative Polarity
Cell
Bias = 0mV
Bias = 150mV
Bias = 200mV
Bias = 300mV

Model IR-700

NOTE

5. Service and Maintenance

5.1 Calibration Frequency

In most applications, quarterly to biannual zero and semi-annual to annual span calibration intervals will
assure reliable detection. However, industrial environments differ. Upon initial installation and
commissioning, close frequency tests should be performed, weekly to monthly. Test results should be
recorded and reviewed to determine a suitable calibration interval.

5.2 Visual Inspection

The Sensor should be inspected annually. Inspect for signs of corrosion, pitting, and water damage. During
visual inspection, the Splash Guard should be removed and inspected to insure that it is not blocked. Examine
the porous 316SS flame arrestor within the sensor’s bottom housing for signs of physical blockage or severe
corrosion. Also, inspect inside the Junction Box for signs of water accumulation or Terminal Block corrosion.

5.3 Condensation Prevention Packet

A moisture condensation packet should be installed in every explosion proof Junction Box. The moisture
condensation prevention packet will prevent the internal volume of the J-Box from condensing and
accumulating moisture due to day-night humidity changes. This packet provides a critical function and should
be replaced annually. Detcon’s PN is 960-202200-000.

Plug-in Replacable

Housing Bottom

Assembly

Splash Guard

O-Rings

Combustible

Hydrocarbon Sensor

Housing Bottom
Locking Set-Screw

LEL Sensor

IR-700

MODEL

Magnetic
Programming
Switches

detcon inc.

detcon inc.

Figure 15 Sensor Assembly

5.4 Replacement of IR Plug-in Combustible Gas Sensor

a) Remove power to IR-700 sensor by lifting the + 24 VDC wire in J-Box.

: It is necessary to remove power while changing the plug-in combustible gas sensor in
order to maintain area classification.

Lens and LCD
Display

Intelligent Transmitter Module (ITM)
Micro-Processor controlled circuit
encapsulated in an explosion proof
housing.

b) Use a M1.5 Allen wrench to release the locking setscrew that locks the ITM and bottom housing

together (One turn will suffice – Do not remove setscrew completely).

c) Remove splashguard. Unthread and remove the Bottom Housing from the ITM.

IR-700 Instruction Manual Rev. 3.1 Page 29 of 40

Model IR-700

NOTE

NOTE

d) Gently pull the plug-in IR combustible gas sensor out of the ITM. Orient the new plug in sensor so

that it matches with the female connector pins. It may be necessary to look from below to assure
alignment is correct. When properly aligned, press the sensor in firmly to make the proper connection.

e) Thread the Bottom Housing onto the ITM to a snug fit and tighten the locking setscrew using the M1.5

Allen wrench. Reinstall the splashguard.

f) With the new IR plug-in sensor physically installed, two functions are required to be performed:

1) Perform the Set Sensor Gain function to match the new sensor with the ITM (Section 3.5.6).

2) Perform a successful AutoZero and AutoSpan to match the new sensor with the ITM (Section 3.4).

5.5 Replacement of ITM

a) Disconnect all sensor wire connections at the J-Box after removing power source.

: It is necessary to remove power to the J-Box while changing the ITM in order to

maintain area classification.

b) Use wrench and the wrench flats provided at the top section of the ITM and unthread until it can be

removed.

c) Use a M1.5 Allen wrench to release the locking setscrew that locks the ITM and bottom housing

together (One turn will suffice – Do not remove setscrew completely).

d) Remove splashguard. Unthread and remove the Bottom Housing from the ITM.

e) Gently pull the plug-in IR combustible gas sensor out of the ITM and set it aside along with the

bottom housing and splashguard. Orient the plug in sensor so that it matches with the female
connector pins on the new ITM and press, the sensor in firmly to make proper connection.

f) Thread the bottom housing onto the ITM until snug, tighten the locking setscrew and reconnect

splashguard.

g) Feed the sensor assembly wires through the ¾” female NPT mounting hole and thread the assembly

into the J-box until tight and the ITM lens faces toward the front access point. Connect the sensor
assembly wires inside J-Box (Refer to Section 2.6, and Figure 11).

h) Two functions are required to be performed on the new ITM:

i) Perform the Set Sensor Gain function to match the new sensor with the ITM (Section 3.5.6).
ii) Perform a successful AutoZero and AutoSpan to match the new sensor with the ITM (Section 3.4).

5.6 Replacement of IR-700 Sensor Assembly

a) Disconnect all sensor wire connections at the J-Box, after removing power source.

: It is necessary to remove power to the J-Box while changing the IR-700 sensor in

order to maintain area classification.

b) Use wrench and the wrench flats provided at the top section of the sensor and unthread until it can be

removed.

IR-700 Instruction Manual Rev. 3.1 Page 30 of 40

Model IR-700

c) Feed the new IR-700 sensor assembly wires through the ¾” female NPT mounting hole and thread the

assembly into the J-box until tight and the ITM lens faces toward the front access point. Connect the
sensor assembly wires inside J-Box (Refer to Section 2.6, and Figure 11).

d) IR-700 sensors are factory calibrated. However, they will require an initial AutoZero and AutoSpan

(Section 3.4). They must also be configured per customer specific application requirements.

6. Troubleshooting Guide

Refer to the list of Failsafe Diagnostic features listed in Section 3.6.2 for additional reference in
troubleshooting activities. Listed below are some typical trouble conditions and their probable cause and
resolution path.

Zero Fault

 Probable Cause: Sensor Zero has drifted to <-10% LEL.
 Redo AutoZero.
 Replace the plug-in IR sensor if problem persists.

Sensor Fault

Probable Causes: Plug-in sensor has failed.

 Recycle power to see if fault clears.
 Check “View Sensor Status” for a report of Active and Reference Counts (active and reference counts

should be about 3000 with no gas applied).

 Perform Set Sensor Gain and note count values for Ag and Rg (Ag should be 7-11 and Rg should be

33-43).

 Replace the plug-in IR sensor.
 If problem persists with new plug-in sensor, replace ITM.

AutoSpan Calibration Faults – (Range, Stability, and Clearing)

 To clear any AutoSpan Calibration fault, the AutoSpan process must be completed successfully.

Range Fault

Probable Causes: Cal Gas not applied or not applied at appropriate time, Failed Sensor, Problems w/ cal gas
and delivery

 Perform AutoSpan following the instructions explicitly.
 Check that cal gas value matches the AutoSpan level.
 If using Splashguard with Integral Cal Port, must use Calibration Wind Guard or air movement can

compromise span gas delivery.

 Verify correct Gas Type and Gas Factor is entered.
 Check validity of span gas and flow rate (check MFG date on cal cylinder).
 Check for obstructions through stainless steel sinter element (including being wet).
 Replace the plug-in IR sensor, and/or bottom housing.

Stability Fault

Probable Causes: Failed Sensor, empty or close to empty Cal Gas Cylinder or problems with cal gas and
delivery

 Perform AutoSpan following the instructions explicitly.
 Check that cal gas value matches the AutoSpan level.

IR-700 Instruction Manual Rev. 3.1 Page 31 of 40

Model IR-700

 If using Splashguard with Integral Cal Port, must use Calibration Wind Guard or air movement can

compromise span gas delivery.

 Verify correct Gas Type and Gas Factor is entered.
 Check validity of span gas and flow rate (check MFG date on cal cylinder).
 Check for obstructions through stainless steel sinter element (including being wet).
 Replace the plug-in IR sensor, and/or bottom housing.

Clearing Fault

Probable Causes: Failed Sensor, Cal Gas not removed at appropriate time, problems with cal gas and delivery,
or Background combustible gases preventing clearing

 Perform AutoSpan following the instructions explicitly.
 Remove calibration adapter and gas connections.
 Confirm no combustible gasses in background.
 Check validity of span gas and flow rate (check MFG date on cal cylinder).
 Check for obstructions through stainless steel sinter element (including being wet).
 Replace the plug-in IR sensor, and/or bottom housing.

Poor Calibration Repeatability

Probable Causes: Failed Sensor, use of wrong Cal Gas, problems w/ cal gas and delivery, Sensor Corrosion

 Check for adequate Sensor Life.
 Increase calibration frequency to quarterly.
 Verify correct Gas Type and Gas Factor is entered.
 Check validity of span gas and flow rate (check MFG date on cal cylinder).
 Check for obstructions through stainless steel sinter element (including being wet).
 Replace the plug-in IR sensor, and/or bottom housing.

Unstable Output/ Sudden spiking

Possible Causes: Unstable power supply, inadequate grounding, or inadequate RFI protection

 Verify Power source is stable.
 Verify field wiring is properly shielded and grounded.
 Contact Detcon to optimize shielding and grounding.
 Add Detcon’s RFI Protection Circuit accessory.

Nuisance Alarms

 Check condulet for accumulated water and abnormal corrosion on terminal blocks.
 If nuisance alarms are happening at night, suspect condensation in condulet.
 Add or replace Detcon’s Condensation Prevention Packet P/N 960-202200-000.
 Investigate presence of other combustible hydrocarbon gases that may be causing sensor response.

Processor and/or Memory Faults

 Recycle power in attempt to clear problem
 Restore Factory Defaults – This will clear the processor’s memory and may correct problem.
 Remember to re-enter all customer settings for cal gas level, set gain, Serial ID after Restore Factory

Defaults.

 If problem persists, replace the Intelligent Transmitter Module.

Unreadable Display

IR-700 Instruction Manual Rev. 3.1 Page 32 of 40

Model IR-700

 If due to excessive sunlight, install a sunshade to reduce glare.

Nothing Displayed – Transmitter not Responding

 Verify condulet has no accumulated water or abnormal corrosion.
 Verify required DC power is applied to correct terminals.
 Swap with a known-good ITM to determine if ITM is faulty.

Faulty 4-20mA Output

If Sensor has a normal reading with no Faults displayed, and the 4-20 mA signal output is 0mA….

 Check that wiring is properly connected at terminal blocks and through to controller inputs.
 The 4-20mA output loop must be closed to avoid a Loop Fault. If the 4-20mA output is not being

used the green wire from the sensor must be connected to the (-) terminal on the Transient Protection
Module to ensure that it does not create a 4-20mA Fault. (section 2.6 Field Wiring)

 Perform a “Signal Output Check” sequence via Section 3.5.7 and verify 4-20mA output with Current

Meter.

 Swap with new ITM to determine if the ITM’s 4-20mA output circuit has failed.
 If the 4-20mA current loop is still out of tolerance, contact Detcon at [e-mail], or contact

Detcon customer service.

No Communication – RS-485 Modbus™

If unit has a normal reading with no Faults displayed and the Modbus™ is not communicating….

 Verify that the correct (and non-duplicated) serial address is entered (per Section 3.5.5).
 Check that wiring is properly connected at terminal blocks and through to controller inputs.
 Perform a “Signal Output Check” sequence via Section 3.5.7 and troubleshoot wiring.
 Swap with new ITM to determine if the ITM’s serial output circuit is faulty.

IR-700 Instruction Manual Rev. 3.1 Page 33 of 40

Model IR-700

7. Customer Support and Service Policy

Detcon Headquarters
Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381
Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067
Phone: [phone], or 281.367.4100
Fax: [phone]

• www.detcon.com

• [e-mail]

• [e-mail]

All Technical Service and Repair activities should be handled by the Detcon Service Department via phone,
fax, or email at contact information given above. RMA numbers should be obtained from the Detcon Service
Department prior to equipment being returned. For on-line technical service help, customers should have the
model number/ part number, and serial number of product type in question.

All Sales activities (including spare parts purchase) should be handled by the Detcon Sales Department via
phone, fax, or email at contact information given above.

Warranty Notice

Detcon Inc. warrants the Model IR-700 gas sensor to be free from defects in workmanship of material under
normal use and service for two years from the date of shipment on the ITM electronics and for a 5-year period
on the plug-in IR combustible gas sensor and the IR CO2gas sensor. See Warranty details below.

Detcon Inc. will repair or replace without charge any such equipment found to be defective during the
warranty period. Full determination of the nature of, and responsibility for, defective or damaged equipment
will be made by Detcon Inc. personnel.

Defective or damaged equipment must be shipped to the Detcon Inc. factory or representative from which the
original shipment was made. In all cases, this warranty is limited to the cost of the equipment supplied by
Detcon Inc. The customer will assume all liability for the misuse of this equipment by its employees or other
contracted personnel.

All warranties are contingent upon the proper use in the application for which the product was intended and
does not cover products which have been modified or repaired without Detcon Inc. approval, or which have
been subjected to neglect, accident, improper installation or application, or on which the original identification
marks have been removed or altered.

Except for the express warranty stated above, Detcon Inc. disclaims all warranties with regard to the products
sold. Including all implied warranties of merchantability and fitness and the express warranties stated herein
are in lieu of all obligations or liabilities on the part of Detcon Inc. for damages including, but not limited to,
consequential damages arising out of, or in connection with, the performance of the product.

IR-700 Instruction Manual Rev. 3.1 Page 34 of 40

Model IR-700

8. IR-700 Sensor Warranty

Plug-in IR Combustible Gas Sensor Warranty
Detcon Inc. warrants, under normal intended use, each new plug-in IR combustible gas sensor (PN 370-

3658CH-700 for combustible, P/N 370-865878-700 for ≤5% CO2, and P/N 370-287724-700 for ≥10%

CO2.) for a five year period under the conditions described as follows: The warranty period begins on the date
of shipment to the original purchaser and ends 5 years thereafter. The sensor element is warranted to be free
of defects in material and workmanship. Should any sensor fail to perform in accordance with published
specifications within the warranty period, return the defective part to Detcon, Inc., 4055 Technology Forest
Blvd., The Woodlands, Texas 77381, for necessary repairs or replacement.

First Two Years: no charge
3rdyear: 25% of replacement charge
4thyear: 50% of replacement charge
5thyear: 75% of replacement charge
Non-Warranty: 100% of replacement charge

Terms & Conditions

 The original serial number must be legible on each sensor element base.
 Shipping point is FOB the Detcon factory.
 Net payment is due within 30 days of invoice.
 Detcon, Inc. reserves the right to refund the original purchase price in lieu of sensor replacement.

ITM Electronics Warranty

Detcon Inc. warrants, under intended normal use, each new Model 700 Intelligent Transmitter Module to be
free from defects in material and workmanship for a period of two years from the date of shipment to the
original purchaser. All warranties and service policies are FOB the Detcon facility located in The Woodlands,
Texas.

Terms & Conditions

 The original serial number must be legible on each ITM.
 Shipping point is FOB the Detcon factory.
 Net payment is due within 30 days of invoice.
 Detcon, Inc. reserves the right to refund the original purchase price in lieu of ITM replacement.

IR-700 Instruction Manual Rev. 3.1 Page 35 of 40

9. Appendix

9.1 Specifications

Sensor Type: Continuous diffusion/adsorption type

NDIR Non-Dispersive Infrared
Sub-miniature plug-in replaceable type

Sensor Life: 5 years typical

Measurement Range:

Combustible 0-100% LEL, 0-50% LEL, 0-100% by volume (Combustible Gas)
CO

2

Accuracy/ Repeatability:

Combustible ± 3% 0-50% LEL; ± 5% 51-100% LEL
CO

2

Response Time:

Combustible T50 < 10 seconds, T90 < 30 seconds
CO

2

0-0.3/0.5/0-1/0-3/0-5 (low range version)
0-10/0-15/0-20/0-25/0-50/0-100 (high range version)

± 5% of Range

T50 < 15 seconds, T90 < 40 seconds

Model IR-700

Zero Drift (Combustible): ≤2% per 2 years

Outputs: Linear 4-20mA

RS-485 Modbus™ RTU

Electrical Classification: Explosion proof

CSAandUS(NRTL)

Class I,Division1,GroupsB,C,D (Tamb = -40°Cto+75°C)
Class I, Zone 1, Group IIB+H2

ATEX

EExdIIB+H2T4(Tamb=-40°Cto+75°C)

Ingress Protection: NEMA 4X, IP66

Safety Approvals: CCSAUS Performance to ISA12.13.01-2000 and CSA22.2 #152

ATEX
CEMarking
SIL2 FMEDA Rating

Warranty: Plug-in detector – 2 years pro-rated

Transmitter – 2 years

Environmental Specifications

Operating Temperature: -40°F to +167F°; -40°C to +75°C

Storage Temperature: -40°F to +167F°; -40°C to +75°C

IR-700 Instruction Manual Rev. 3.1 Page 36 of 40

Operating Humidity: 0-100% RH (Non-condensing)

Mechanical Specifications

Dimensions: 7"H x 2.2" Dia.; 178mmH x 65mm Dia. (sensor assembly only)

11"H x 6.1"W x 3.75"D; 280mmH x 155mmW x 96mmD (with junction box)
Mounting holes (J-box) 5.5"; 140mm center to center

Weight: 2 lbs; 0.907kg (sensor only)

6 lbs; 2.72kg (w/aluminumj-box)
9 lbs; 4.08kg (w/stainless steel j-box)

Electrical Specifications

Power Input: 11-30VDC

Power Consumption: Normal operation = 68mA (<1.7 watt)

Maximum = 85mA (2 watts)

Model IR-700

Inrush current: 0.67A @ 24V

RFI/EMI Protection: Complies with EN61000

Analog Output: Linear 4-20mA DC current (1000 ohms maximum loop load @ 24VDC)

0mA All Fault Diagnostics
2mA In-Calibration
4-20mA 0-100% full-scale
22mA Over-range condition

Serial Output: RS-485 Modbus™ RTU

Baud Rate: 9600 BPS (9600,N, 8 ,1 Half Duplex)

Status Indicators: 4-digit LED Display with gas concentration,

full-script menu prompts for AutoSpan,
Set-up Options, and Fault Reporting

Faults Monitored: Loop, Input Voltage,

Zero,Sensor,
Processor, Memory, Calibration

Cable Requirements: Power/Analog:

3-wire shielded cable
Maximum distance is 13,300 feet with 14 AWG

Serial Output:

2-wire twisted-pair shielded cable specified for RS-485 use
Maximum distance is 4,000 feet to last sensor

I/O Protection: Over-Voltage, Miss-wiring, EMI/RFI Immunity

IR-700 Instruction Manual Rev. 3.1 Page 37 of 40

9.2 Spare Parts, Sensor Accessories, Calibration Equipment

2

2

2

2

Part Number Spare Parts

927-215500-100 IR-700 Intelligent Transmitter Module (ITM)
602-003152-000 Model 700 Housing Bottom Assembly (includes Flame Arrestor)
370-3658CH-700 Replacement Plug-in IR Combustible Gas Sensor
370-865878-700 Replacement Plug-in CO
370-287724-700 Replacement Plug-in CO
500-003087-100 Transient Protection PCA

Sensor Accessories

897-850800-000 NEMA 7 Aluminum Enclosure less cover – 3 port
897-850400-000 NEMA 7 Aluminum Enclosure Cover (Blank)
897-850801-316 NEMA 7 316SS Enclosure less cover – 3 port
897-850401-316 NEMA 7 316SS Enclosure Cover (Blank)
613-120000-700 Sensor Splashguard with integral Cal-Port
613-2R0000-000 Remote Calibration Adapter
943-002273-000 Harsh Environment Sensor guard
327-000000-000 Programming Magnet
960-202200-000 Condensation prevention packet (for J-Box replace annually)

Sensor (Ranges ≤ 5%)
Sensor (Ranges ≥10%)

Model IR-700

Calibration Accessories

943-000000-000 Calibration Wind Guard
943-000006-132 Threaded Calibration Adapter
943-020000-000 Span Gas Kit: Includes calibration adapter, In-Line Humidifying Tube,

200 cc/min fixed-flow regulator, and carrying case.
(Does not include gas).

942-520124-050 Span Gas cylinder: 50% LEL Methane balance air

Contains 104 liters of gas and is good for 175 calibrations

942-520124-025 Span Gas cylinder: 25% LEL Methane balance air

Contains 104 liters of gas and is good for 175 calibrations

942-400123-XXX Span Gas Cylinder with CO2 balance air. (XXX denotes % by volume

concentration i.e. 10% = “-010”)

943-090005-502 200 cc/min Fixed Flow Regulator for span gas bottle

Recommend Spare Parts for 2 Years

927-215500-100 IR-700 Intelligent Transmitter Module (ITM)
602-003152-000 Housing Bottom Assembly (includes Flame Arrestor)
370-3658CH-700 Replacement Plug-in IR Combustible Gas Sensor
370-865878-700 Replacement Plug-in CO
370-287724-700 Replacement Plug-in CO

Sensor (Ranges ≤ 5%)
Sensor (Ranges ≥10%)

500-003087-100 Transient Protection PCA
960-202200-000 Condensation prevention packet (for J-Box replace annually)

IR-700 Instruction Manual Rev. 3.1 Page 38 of 40

9.3 Model IR-700 Engineering Drawings

1) IR-700 Series Breakaway and Wiring

2) IR-700 Series Wiring and Dimensional, 316 SS condulet

3) IR-700 Series Wiring and Dimensional, Aluminum condulet

10.Revision Log

Model IR-700

Revision Date Changes made Approval

2.1 12/08/10 Changed ATEX certification line under Electrical Classification
in Section 9.1 from “Eex d IIB+H2T4” to “II 2 G Ex d IIB+H2
T4” to match ATEX approval label for IR-700. Added Revision
Log Section 10.

2.2 04/25/11 Removed Teflon note in Section 2.5. LU

2.3 07/11/11 Added aluminum condulet wiring and dimensional drawing.
Inrush current information added to specifications.
Electrical connections changed from six to five wires.

2.4 04/16/12 Changed cable recommendation, updated the Modbus Register
Map.

2.5 01/08/13 Updated ATEX approvals label, updated EN standards that
sensor assembly meets. Updated ATEX listing in specifications

2.6 04/02/13 Updated ATEX installation instructions regarding use of ring
terminal for earth ground using screw and lock-washer. Updated
guidelines for metric special fasteners used in 700 assembly

2.7 04/05/13 Added 50% LEL Range LU

2.8 10/17/13 Updated for 4-30mA errors LU

2.9 11/20/2013 Update Field Wiring LU

3.0 12/25/13 Update Calibration to include Wind Guard BM

3.1 02/14/14 Update 4-20mA wiring, and specifications BM

B.M.

LU

LU

BM

BM

IR-700 Instruction Manual Rev. 3.1 Page 39 of 40

Model IR-700

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Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

IR-700 Instruction Manual Rev. 3.1 Page 40 of 40

6

Sensor Wiring
to Junction Box

Intelligent

Transmitter
Module
(ITM)

IR-700

LEL Sensor

Customer

Supplied Wiring (In)

Modbus RS-485 to

Host Control Device

Transient Protection Module
(TPM) P/N 500-003087-100

Explosion

Proof

Junction Box

Customer

Supplied Wiring

(Out to next Device)

Power to next Device

(+)
(-)
mA

A(+)
B(-)

Modbus RS-485 to

next Device

Install a 100-250 Ohm

resistor if the 4-20mA

output is not used

Plug-in
Sensor

Housing Bottom
Locking Set-Screw

Remove Housing Bottom
from ITM to access Plug­in Sensor

Housing Bottom
Assembly
602-003152-000

O-Rings

Wiring to

Sensor Assembly

Ground Points

Earth-Ground connection
is made via 6-32
mounting holes.

6-32 threaded

Ground point

Splash Guard

613-120000-700

NOTES:

det c on , i nc . 3200 Research Forest Dr. A -1 * The W oodlands Texas 77381 * www.detcon.com

P.O. NO.

NA

The information and technical data disclosed by

6 10/08/13 Change Splashguard and Housing RH LU BM 3169 Updates

CLIENT:

PROJECT:

NA

_

IR-700 Series

REQ. NO.

NA

only for the purposes and to the extent

RH SF NA

PROJECT NO.

SERIAL NO.

PLANT:

NA
NA
NA

in writing. Such information and technical data
are proprietary to Detcon Incorporated and may
not be used or disseminated except as provided
in the foregoing sentence.

3204/01/07
11/28/06

TPM Changed

Correct pinout on TPM

REVISION HISTORY

RHRHEM
EM

BM
BM

APPD

3169
3169

DWG #

Updates
Updates

SUBJECT

DRAWN BY:

R HUTSKO

FIRST ISSUE:

03/30/06

SCALE

NTS

SALES ORDER NO.

NA

SHEET NUM.

NA

DRAWING NO.

3169-1

SIZE REV

A 6

Power from and 4-20mA

detcon inc.

MODEL

out to Control Device

(+)

(-)mAA(+)

B(-)

this document may be used and disseminated 5 06/25/10 Add this draw ing for Aluminum Condulet RH SF BM 3169

Updates

Breakaway and Wiring

Rev DATE DESCRIPTION DRN CHKD

REF. DWGS

specifically authorized by Detcon Incorporated

4

01/14/08

Removed yellow wire

BM

3169

Updates

REV

3169-1

A

DRAWING NO.

JOB NO.NASIZE

Blk

Red

(+)mA(-)

Blu

Grn

A(+)

Wht

B(-)

This page left intentionally blank

Model IR-700

Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

IR-700 Instruction Manual Rev. 3.1

6

REV

A

3169-2

SIZE

mounting surface)

DRAWING NO.

Wall (or other

Spacer

Bolt

Mounting

ITM

3200 Res earch Forest Dr. A-1 * The Woodlands Texas 77381 * www.detcon.com

and Mounting

IR-700 Series

Wiring, Dimensional,

NANTS

NA

SALES ORDER NO.

SHEET NUM.

SCALE

_

NA

03/30/06

NA

detcon, inc.

Ground Point

6-32 threaded

Use Spacers to move

the J-Box and Sensor

allow access to Sensor

Ø0.265"

Mounting Hole

" NPT Fitting

4

3

Plug unused ports

5"

5.5"

Mounting Holes

5.25"

Junction-Box

(Detcon's J-Box Shown)

Explosion Proof Housing

8-32 Threaded

Ground Point

wall at least 0.25-0.5" to

Assembly away from the

Typ.

12.5"

7.2"

Typ.

4.9"

Typ.

MODEL

IR-700

detcon inc.

LEL

2.125"

2"

(ITM)

CLIENT:

R. Hutsko

PROJECT:

Updates

BM 3169

RH LU

Add this drawing for Aluminum Condulet06/25/105 3169BMSFRH Updates

6 10/08/13 Change Splashguard and Housing

FIRST ISSUE:

DRAWN BY:

Updates

Updates

Updates

SUBJECT

REF. DWGS

3169

3169

3169

DWG #

APPDDRN CHKD

SFRH

EMRH

EMRH

TPM Changed04/01/073 BM

Removed yellow wire01/14/084 BM

Correct pinout on TPM11/28/062 BM

REVISION HISTORY

Rev D ATE DESCRIPTION

IR-700 Inteligent

" NPT Fitting

4

3

Transmitter Module

Housing Bottom

this document may be used and disseminated

The information and technical data disclosedby

not be used or disseminated except as provided

only for the purposes and to the extent

in writing. Such information and technical data

are proprietary to Detcon Incorporated and may

in the foregoing sentence.

specifically authorized by Detcon Incorporated

Ø0.265"

Splash Guard

Mounting Hole

" NPT Fitting

4

EYS Seal Fitting

3

Installation Method

Recommended Electrical

Proof

NA

JOB NO.

Conduit

SIZE

A

DRAWING NO.

3169-2

REV

6

"T"

Drain

Junction Box

(-)

(+)

mA

B(-)

N/U

A(+)

Customer

Supplied Wiring

output is not used

resistor if the 4-20mA

Install a 100-250 Ohm

Wht

Blu

Grn
Blk

Red

(TPM) P/N 500-003087-100

Transient Protection Module

Enclosure to ground unit

properly. Mount to bottom of

Mount TPM in ExplosionProof

B(-)
A(+)

mA

Wiring to

(-)
(+)

Sensor Assembly

NOTES:

If the Sensor is not mechanically

enclosure using 6-32 screws.

NA

NANANA

NA

PROJECT NO.

P.O. NO.

to insure proper grounding.

grounded to the Junction Box, and

external ground strap should be used

SERIAL NO.

REQ. NO.

PLANT:

This page left intentionally blank

Model IR-700

Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

IR-700 Instruction Manual Rev. 3.1

6

5.5" 3.95"

5.2"

Detcon's Aluminum

Explosion Proof

Junction-Box

(Condulet)

4

" NPT Port

Plug unused ports

5.8276"

8-32 Threaded

Ground Point

Ø0.275"

Mounting

Hole

detcon inc.

MODEL

IR-700

4.9"

Typ.

13" Typ

6-32 Threaded

Ground Point

Sensor Assembly

LEL

0.3" Typ

Splash Gaurd

2"

NOTES:

det c on , i nc . 3200 Research Forest Dr. A -1 * The W oodlands Texas 77381 * www.detcon.com

SERIAL NO.

PLANT:

NA
NA
NA
NA

The information and technical data disclosed by
this document may be used and disseminated
only for the purposes and to the extent
specifically authorized by Detcon Incorporated
in writing. Such information and technical data
are proprietary to Detcon Incorporated and may
not be used or disseminated except as provided
in the foregoing sentence.

6 10/08/13 Change Splashguard and Housing RH LU BM 3169

Rev D ATE DESCRIPTION DRN C HKD APPD DWG #

REVISION HISTORY

Updates
Updates
Updates
Updates
Updates

SUBJECT

FIRST ISSUE:

06/25/10

IR-700 Series

with Detcon Aluminum

SHEET NUM. SIZE REV

NA

A

6

3

P.O. NO.

REQ. NO.

PROJECT NO.

NA

5

4

3

2

06/25/10

01/14/08

04/01/07

11/28/06

Add this draw ing for Aluminum Condulet

Removed yellow wire

TPM Changed

Correct pinout on TPM

RH

RH

RH

RH

SF

SF

EM

EM

BM

BM

BM

BM

3169

3169

3169

3169

REF. DWGS

NA

DRAWN BY:

R HUTSKO

CLIENT:

PROJECT:

NA

_

SCALE

NTS

Junction-Box

SALES ORDER NO.

NA

DRAWING NO.

3169-3

REV

3169-3

A

DRAWING NO.

JOB NO.NASIZE

This page left intentionally blank

Model IR-700

Shipping Address: 4055 Technology Forest Blvd., The Woodlands Texas 77381

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

IR-700 Instruction Manual Rev. 3.1