Sierra Monitor Corporation 4105 User Manual
MODEL 4105 SERIES
GAS SENSOR MODULE
WITH DIGITAL DISPLAY AND
NON-INTRUSIVE CALIBRATION
4-20 mA
Sierra Monitor Corporation
1991 Tarob Court, Milpitas, CA 95035
(408) 262-6611 (800) 727-4377
Fax: (408) 262-9042
E-Mail: sierra@sierramonitor.com
MODEL 4105 SERIES
GAS SENSOR MODULE
WITH DIGITAL DISPLAY AND
NON-INTRUSIVE CALIBRATION
4-20 mA
APPLICABILITY & EFFECTIVITY
This manual provides instructions for the following Sierra Monitor products:
Model Description
4105-02 Combustible Gas Sensor Module with Non-Intrusive Calibration
4105-03 Oxygen Gas Sensor Module with Non-Intrusive Calibration
4105-04 Carbon Monioxide Gas Sensor Module with Non-Intrusive Calibration
4105-05 Hydrogen Sulfide Gas Sensor Module with Non-Intrusive Calibration
4105-06 Chlorine Gas Sensor Module with Non-Intrusive Calibration
4105-07 Hydrogen Gas Sensor Module with Non-Intrusive Calibration
4105-10 Sulfur Dioxide GasSensor Module with Non-Intrusive Calibration
4105-12 Nitrogen Dioxide Gas Sensor Module with Non-Intrusive Calibration
4105-21 Hydrogen Chloride Gas Sensor Module with Non-Intrusive Calibration
4105-22 Hydrogen Cyanide Gas Sensor Module with Non-Intrusive Calibration
4105-25 Ammonia Gas Sensor Module with Non-Intrusive Calibration
4105-26 Hydrogen Flouride Gas Sensor Module with Non-Intrusive Calibration
The instructions are effective for the above models as of April 1, 1998
Instruction Manual Part Number: T13008
Rev. E1
TABLE OF CONTENTS
SECTION PAGE
1. PRODUCT DESCRIPTION 1
1.1 Introduction 1
1.2 Application 1
1.3 Configuration 1
1.3.1 Electronics 1
1.3.2 Sensor 1
2. CAUTIONS WARNINGS & RECOMMENDATIONS 2
2.1 Introduction 2
2.2 Wiring 2
2.3 Sensor Modules - General 2
2.4 Preventative Maintenance 2
3. QUICK START 3
3.1 Overview 3
3.2 Wiring 3
3.3 Module Installation 3
3.4 Wiring Connection 3
3.5 Transmitter Installation 3
3.6 Start-up & Operation 3
4. OPERATION 4
4.1 Introduction 4
4.2 Signal Value 4
5. CALIBRATION 5
5.1 Frequency of Calibration 5
5.2 Calibration Process 5
5.3 Equipment Required 5
5.4 Calibration Procedure 5
5.5 Fault Supervision 5
6. SERVICE 6
6.1 Sensor Module Configuration 6
6.2 Enclosure Replacement 6
6.3 Transmitter Replacement 6
6.4 Sensor Replacement 6
7. INSTALLATION 8
7.1 Sensor Locations 8
7.2 Sensor Mounting 8
7.3 Explosion Proof Installation 8
7.4 Power Supply 8
8. SPECIFICATIONS 10
9. REPLACEMENT PARTS 13
10. WARRANTY 13
11. APPENDICES 14
1. PRODUCT DESCRIPTION
5.42"
2.81"
1.75"
4.50"
7.25"
1.1 Introduction
Model 4105 Series Gas Sensor module features nonintrusive calibration, 4-20 mA output signal and local
continuous display of the gas concentration in ppm
(toxics), % LEL (Combustibles), or % vol (Oxygen). It
is designed for use with industry standard control instruments.
This manual provides instructions for 4105 series gas
sensor modules that utilize common packaging and
transmitter electronics with different sensors for detection of various gases. The full model number of
the gas sensor module includes a suffix, 4105-XX,
where “XX” is a number that identifies a gas type.
1.2 Application
The Model 4105-XX Gas sensor is intended for use in
ambient monitoring applications. It is designed for
fixed installation and for continuous operation.
Instruction Manual
Figure 1.1 Model 4105 Gas Sensor Module
Optional fittings and adapters can be supplied by Sierra Monitor to provide continuous sample delivery
to the sensor module.
1.3 Configuration
The gas monitor is comprised of a NEMA-7/4 enclosure which contains the transmitter electronics and a
gas sensor which is installed in one of the two 3/4"
conduit hubs.
FAULT /KEYPAD
MODEL 4105-02
Combustibles
% LEL
5.50"
Unity SPAN ZERO
Ph. 408-262-6611
Milpitas, CA
CAL
1.3.1 Electronics
When installed, the transmitter electronics will be connected to a power supply and control device via three
wire cable.
The electronics provide a 4-20 mA current loop which
is proportional to the full sensitivity of the sensor.
Integral features include:
- L.C.D. readout of ppm of gas concentration.
- Magnetic switches for non-intrusive calibration.
- Visual indicators for fault condition.
- Electrical fault (0 mA) to controller.
The transmitter electronics assembly includes a
printed circuit assembly and a cover plate which contains the L.C.D. readout and magnetic switches for
calibration.
1.3.2 Sensor
The gas sensor cell is enclosed in a threaded housing
and is plugged into a signal card located in the enclosure. This configuration allows for easy field replacement of the sensor cell.
Figure 1.2 Outline View - Gas Sensor Module
Model 4105 Gas Sensor Module (12/02)
Combustible: The gas sensor is a catalytic bead type.
Toxics & Oxygen: The gas sensor is an Electro Chemi-
cal type.
Page: 1
Instruction Manual
2. CAUTIONS WARNINGS &
RECOMMENDATIONS
2.1 INTRODUCTION
Although the sensor module is designed and constructed for installation and operation in industrial
applications including “hostile” environments, caution should be taken to insure that the installation is
in compliance with this instruction manual and that
certain procedures and conditions are avoided.
READ AND UNDERSTAND THIS INSTRUCTION
MANUAL BEFORE OPERATING OR SERVICING
THIS EQUIPMENT.
Wire Gauge Maximum Length
20 AWG 2,000 Ft.
18 AWG 3,000 Ft.
16 AWG 4,000 Ft.
14 AWG 6,500 Ft.
12 AWG 9,000 Ft.
Table 2.1
Recommended Wire/Cable Gauge
NOTE: Temperature rating of cable wire insulation
must be above 75oC (85oC or greater rated wiring is
recommended). If cable runs through higher temperature environments, it should be specified for that environment.
2.2 WIRING
Electro magnetic and radio frequency interference to
the analog communication between the sensor and
the controller may occur. The manufacturer recommends that extra caution be taken where the installation is near any sources of these interferences:
Avoid running sensor cable close to high power
cables, radio transmission lines, or cables subject to
pulses of high current. Avoid running cables near
large electric motors or generators.
Use shielded cable in any location which may be expected to be electrically noisy or where cable is expected to be in close contact with AC wiring. The
shield should be connected to the controller common, one side only.
The wiring should be run in either a cable tray or
conduit as required by applicable code and area classification. Control wiring should not be installed in a
cable tray or conduit with higher voltage and AC circuits. See Table 2.1 for recommended wire gauge.
Wiring connections at the gas sensor module are as
follows:
Wire# Function Terminal
1 Power PWR
2 Signal SIG OUT
3 Ground GND
Connect an earth ground to the ground screw provided in the base of the gas sensor module enclosure.
All splices must be via either a lug and terminal system or soldered. Improperly spliced cable can result
in corrosion, resistance changes and system errors.
2.3 SENSOR MODULES - GENERAL
Sensors should be facing down. Avoid installing sensor modules where they will be unnecessarily exposed
to wind, dust, water (esp. direct hose down), shock,
or vibration. Observe temperature range limitations.
Sensors may be adversely affected by prolonged exposure to certain materials. Loss of sensitivity, or
corrosion, may be gradual if such materials are present
in low concentrations. These materials include: Halides (compounds containing chlorine, fluorine, bromine, or iodine), silicones, acid vapors, caustic liquids or vapors.
Sensor modules must not be painted. Paint may contain compounds which will contaminate the sensor.
Paint will also cause clogging of the sintered metal
cup and will cause difficulties during attachment of
the calibration fitiing. The module should be tagged
“DO NOT PAINT”.
When sensors are replaced the thread on the sensor
housing must be lubricated with an antizieze com-
pound non-silicone based to avoid metal to metal
binding which will damage the housing threads.
2.4 PREVENTATIVE MAINTENANCE
DUST AND DIRT CONTROL: When calibration is
performed the controller and sensors should be
checked visually to determine if dust or dirt build up
needs to be removed. This cleaning should be done
with dry instruments such as compressed air, cloth
wipes or wisk broom.
WIRING OR CABLE CONDITIONS: Any wiring or
cables which are not in conduit should be checked
once a year for damage to insulation or corrosion
of splice or terminal points.
Page: 2
Model 4105 Gas Sensor Module (12/02)
3. QUICK START
MODEL 4105-05
3.1 Overview
The gas sensor module has been supplied factory calibrated and ready for immediate installation and operation. An installer familiar with installation and operation of gas detection products can use this section to
begin immediate use of the monitor.
3.2 Wiring
Provide three conductor wiring from the power supply/control device to the sensor module location. See
section 2.2 for wiring specifications.
3.3 Module Installation
Remove spring on electromechanical sensor prior to
installation. See Figure below.
Instruction Manual
PPM
HS PPM
2
GAS MONITOR
Unity
Typical Vertical Mounting on Conduit
FAULT
ZEROSPAN
Figure 3.1
The module can either be installed on the end of a
3/4" conduit, or attached to a vertical surface using
the mounting flange on the enclosure.
WARNING:
- The installation must meet any hazardous environment codes for electrical equipment.
- The sensor module enclosure mounting must be
far enough from any vertical surface to allow removal and replacement of the sensor assembly
which is threaded into the second 3/4" conduit
hub.
3.4 Wiring Connection
To gain access to the I/O PCB for wiring or mounting
purposes, loosen the two captive thumb screws in the
4105-XX front panel and remove the PANEL/CPU PCB
assembly as far as is allowed by the ribbon cable.
Terminal positions on the I/O printed circuit assembly
are labeled PWR (power), OUTSIG (signal), GND (TB2).
Make the corresponding connections to the control
device/power supply.
The sensor harness should remain connected to the
I/O assembly at “TB1”.
3.5 Transmitter Installation
To install the front panel assembly, align the two thumb
screws with their mating stand-offs and firmly hand
tighten. Be sure the front panel is centered in the
4105-XX housing opening.
WARNING:
- If the sensor transmitter is installed in a classified hazardous area, replace the threaded cover
prior to providing power.
3.6 Start-up & Operation
To begin operation of the sensor module provide 21-30
VDC from a regulated power supply.
Model 4105 Gas Sensor Module (12/02)
Page: 3
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