COMBUSTIBLE GAS DETECTOR
USER MANUAL
UT-P -SC1100
+
Part Number: MAN-0006-00 Rev 2
Copyright © 2003 Net Safety Monitoring Inc.
Printed in Canada
This manual is provided for informational purposes only. Although the information contained in this manual is
believed to be accurate, it could include technical inaccuracies or typographical errors. Changes are, therefore,
periodically made to the information within this document and incorporated without notice into subsequent
revisions of the manual. Net Safety Monitoring Inc. assumes no responsibility for any errors that may be
contained within this manual.
This manual is a guide for the use of a Combustible Gas Monitor and the data and procedures contained within
this document have been verified and are believed to be adequate for the intended use of the monitor. If the sensor
or procedures are used for purposes other than as described in the manual without receiving prior confirmation of
validity or suitability, Net Safety Monitoring Inc. does not guarantee the results and assumes no obligation or
liability.
No part of this manual may be copied, disseminated or distributed without the express written consent of Net
Safety Monitoring Inc.
Net Safety Monitoring Inc. products, are carefully designed and manufactured from high quality components and
can be expected to provide many years of trouble free service. Each product is thoroughly tested, inspected and
calibrated prior to shipment. Failures can occur which are beyond the control of the manufacturer. Failures can be
minimized by adhering to the operating and maintenance instructions herein. Where the absolute greatest of
reliability is required, redundancy should be designed into the system.
Net Safety Monitoring Inc., warrants its sensors and detectors against defective parts and workmanship for a
period of 24 months from date of purchase and other electronic assemblies for 36 months from date of purchase.
No other warranties or liability, expressed or implied, will be honored by Net Safety Monitoring INC
Contact Net Safety Monitoring Inc. or an authorized distributor for details.
Table of Contents
Unit I GENERAL INFORMATION .......................................... 1
DESCRIPTION ......................................................................... 1
FEATURES ........................................................................... 1
TECHNICAL SPECIFICATIONS ........................................................... 1
Sensor Specifications ............................................................. 1
Controller Specifications ........................................................... 2
Figure 1 - Dimensions for Adalet Enclosure 4" (Premium Plus) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2 - Dimensions for JB2 and CB4 Sensor Separation Assembly with SC1100 (LEL) Sensor . 4
UNIT II OPERATION OVERVIEW .......................................... 5
SENSOR ....................................................................... 5
Unit III SYSTEM INSTALLATION .......................................... 5
INSTALLATION ........................................................................ 5
Location of Sensors............................................................... 5
Un packi ng ...................................................................... 5
Mounting ....................................................................... 5
Wiring ......................................................................... 6
Sensor Separation ............................................................... 7
UNI-TRAN PREMIUM PLUS TERMINAL CONNECTION DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 3 Uni-Tran Premium Plus connection diagram for SC1100 Sensor . . . . . . . . . . . . . . . . . . . . . 9
Figure 4 - UNI-TRAN Premium Plus SC1100 Remote Mounting using Sensor Separation . . . . . . . 10
Analog Output .................................................................. 11
Sensor Drift .................................................................... 11
Sensor Life .................................................................... 11
Test Jacks ..................................................................... 11
Unit IV SYSTEM SETTINGS ............................................. 12
MAIN MENU .......................................................................... 12
Figure 5 - Magnetic Reed Switch Activation (Prem ium Plus Model) . . . . . . . . . . . . . . . . . . . . . . . . 12
Summary of Main Menu .......................................................... 12
Unit V SYSTEM CALIBRATION .......................................... 12
CALIBRATION .................. .................. .................. .................. 12
Calibration Procedure (use 50% certified calibration gas) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Periodic Response Check ......................................................... 14
Relay Settings .................................................................. 14
Review Relay Settings ............................................................ 15
SENSOR POISONS AND INHIBITORS..................................................... 15
Table 1 - Table of Responses ...................................................... 15
ORDERING INFORMATION ............................................................. 16
Appendix A Net Safety Monitoring Inc. Electrostatic Sensitive Device Handling
Procedure ........................................................... 17
Appendix B Wire Resistance In Ohms .................................... 18
Appendix C K Factor for Various Gases................................... 19
Unit I GENERAL INFORMATION
DESCRIPTION
The Uni-Tran SC1100 micro-controller based LEL gas detector provides fast, accurate, continuous and cost
effective monitoring of combustible gases in harsh industrial environments.
The SC1100 is a proven, poison resistant, pellistor sensor utilizing active and reference catalytic beads in a
Wheatstone Bridge configuration. The Wheatstone Bridge generates a temperature compensated differential
voltage, that is proportional to a gas concentration when exposed to a wide range of hydrocarbon gases.
The use of advanced micro-controller technology provides a user interface, that is comprehensive yet very
simple to use. The full text LED display gives the user complete instructions for routine operation,
calibration and relay configuration with no tools. Pellistor type, catalytic sensors are highly reliable, but in
conventional systems the sensing element is damaged when exposed to high concentrations of combustible
gas. SensorGuard is a proprietary technology that provides effective protection against this type of damage,
thus reducing the need for frequent calibration and enhancing reliability.
FEATURES
< Widely proven Poison Resistant Catalytic Bead sensor technology
< SensorGuard software based protection
< Low power consumption that works with 12 or 24Vdc systems
< Easy, non-intrusive one person calibration
< Sensor can be remotely mounted up to 75 feet from the display module
< Scrolling alpha-numeric LED display available in English, French or Spanish
< Gas specific colour coded enclosure
< Microprocessor based smart transmitter
< Conformal coated circuit boards
TECHNICAL SPECIFICATIONS
Sensor Specifications
< Operating Temperature Range:
-40/C to +85/C (-40F to +185F)
1
< Weight:
0.1 Kg (0.2 lb)
< Enclosure Material:
Aluminum (optional stainless steel)
< Certifications:
CSA and NRTL/C certified for hazardous locations. Class I, Division 1, Groups B, C and D. IEC
Rating Ex d IIB+H2 T5, NEMA 3R. Performance certified to CSA 22.2 No. 152
< Range of Detection:
0 to100% LEL of most hydrocarbons and hydrogen
< Accuracy:
±3% LEL up to 50% LEL ±5% LEL above 50% LEL
< Response Time:
<10 seconds to T50 <30 seconds to T90
< Linearity/Repeatability:
±3% LEL / ±2% LEL
Controller Specifications
< Operating Voltage Range:
10.5 to 32 Vdc
< Power Consumption (at 24 Vdc):
Nominal (160 mA, 3.8 Watts)
Maximum (190 mA, 4.5 Watts)
< Operating Temperature Range:
-40/C to +85/C (-40F to +185F)
< Humidity Range:
0 to 100% Relative humidity, non-condensing
< Enclosure Material:
Copper Free Cast Aluminum
< W eight:
3.2 Kg (7.0 lb)
< Certifications:
CSA and NRTL/C certified for hazardous locations. Class I, Division 1, Groups B, C and D, NEMA
4X and 7. IEC Rating Ex d IIB+H2 T5
NOTE: Electronics only - CSA and NRTL/C certified for hazardous locations Class I, Division 2
Groups B, C and D pending.
< Current Output:
4-20 mA Into a maximum loop impedance of 800 Ohms at 32 Vdc or 150 Ohms at 10.5 Vdc. Isolated
or non-isolated loop supply.
2
< Relay Output:
Form C contacts rated 1 Amp at 30 Vdc, 0.5 Amp at 125 Vdc. Selectable energized/de-energized,
latching/non-latching
Configurable Fault, Low and High alarms.
< Dimensions:
Refer to Figure 1 or Figure 2
3
Figure 1 - Dimensions for Adalet Enclosure 4" (Premium Plus)
Figure 2 - Dimensions for JB2 and CB4
Sensor Separation Assembly with SC1100
(LEL) Sensor
4
UNIT II OPERATION OVERVIEW
SENSOR
The sensor uses catalytic oxidation technology designed to measure the concentration of
combustible gases in air up to their lower explosive limit. Each sensor is a matched pair of detector
and reference elements which are operated in a Wheatstone Bridge circuit. The active element,
which comprises a coil of platinum wire embedded within a catalytic bead, is capable of oxidizing
combustible gases while the inert reference element compensates for changes in ambient
temperature and humidity. The heat generated during the oxidation of combustible gas increases
the temperature and resistance of the detector element, producing an out-of-balance signal in the
Wheatstone Bridge circuit proportional to the concentration of combustible gas.
Appendix C lists the theoretical ‘K’ factors by which the signal with a calibration gas should be multiplied to
give the signal for other gases.
NOTE:
Figures in Appendix C are theoretical and may differ from sensor to sensor. For best results, each
sensors should be calibrated with the gas it is intended to detect.
Unit III SYSTEM INSTALLATION
INSTALLATION
Location of Sensors
There are no absolute rules for determining the quantity and location of gas detection instruments within a
particular facility, but care should be taken to locate the sensors in areas where gas escape may be expected
and where it is desirable to detect the presence of unwanted gas. Use redundancy where enhanced protection
or reliability is desired. Seek advice from experts who know the characteristics of the gas being detected, air
movement patterns and the facility. Use common sense and refer to various publications that discuss general
guidelines for your industry.
Unpacking
The UNI-TRAN Premium Plus is made up of two primary components. The housing and terminal board are a
single assembly to which the input is wired. The control module is a separate plug-in assembly. Since all
modern electronic equipment can be damaged by static electricity discharge it is important to discharge static
electricity from your body by touching a grounded metal object before handling the module. Loosen the
retaining screws and remove the module carefully from the housing by grasping the centre “pull” knob and
pull straight away, then temporarily store it in a clean safe place until field wiring is connected to the
terminal board located in the base of the housing.
Mounting
The housing should be oriented so that the sensor is on the underside of the housing. Use a conduit seal and
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