MODEL 4105 SERIES GAS SENSOR MODULE WITH DIGITAL DISPLAY AND NON-INTRUSIVE CALIBRATION 4-20 mA
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 4105-02 4105-03 4105-04 4105-05 4105-06 4105-07 4105-10 4105-12 4105-21 4105-22 4105-25 4105-26 Description Combustible Gas Sensor Module with Non-Intrusive Calibration Oxygen Gas Sensor Module with Non-Intrusive Calibration Carbon Monioxide Gas Sensor Module with Non-Intrusive Calibration Hydrogen Sulf
TABLE OF CONTENTS SECTION 1. PRODUCT DESCRIPTION 1.1 Introduction 1.2 Application 1.3 Configuration 1.3.1 Electronics 1.3.2 Sensor 2. CAUTIONS WARNINGS & RECOMMENDATIONS 2.1 Introduction 2.2 Wiring 2.3 Sensor Modules - General 2.4 Preventative Maintenance 3. QUICK START 3.1 Overview 3.2 Wiring 3.3 Module Installation 3.4 Wiring Connection 3.5 Transmitter Installation 3.6 Start-up & Operation 4. OPERATION 4.1 Introduction 4.2 Signal Value 5. CALIBRATION 5.1 Frequency of Calibration 5.
Instruction Manual 1. PRODUCT DESCRIPTION 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.
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. 2.
Instruction Manual 3. QUICK START 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. PPM 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.
Instruction Manual 4. OPERATION 4.1 Introduction Under normal conditions the sensor module does not require operator or technician intervention. The following are conditions under which the module requires attention: - Routine periodic calibration. - Calibration after a high gas alarm. - Sensor replacement on a planned schedule or when a sensor failure occurs. - Periodic cleaning as necessary. - Unanticipated maintenance. 4.
Instruction Manual 5. CALIBRATION 5.1 Frequency of Calibration The manufacturer recommends that the gas sensor module be calibrated every ninety days. 5.2 Calibration Process The output signal of the gas sensor module is calibrated using a span mixture containing a known concentration of the gas of interest. The concentration of the span gas must be within the full scale of the sensor module and should be either 50% of the full scale, or approximately equal to the lowest alarm level.
Instruction Manual 6. 6.3 Transmitter Replacement SERVICE 6.1 Sensor Module Configuration The gas sensor module is comprised of the following sub assemblies: 4105-XX Gas Sensor Module -SPM25002 Transmitter Assembly -SPT25013 Combustible Gas Sensor Module Transmitter Assembly -SPM25003 Oxygen and Toxic Gas Sensor Module Transmitter Assemby (must specify gas type) -4205-XX Sensor Assembly [Where "xx" is the suffix to the gas sensor module number (Table 6.
Instruction Manual 6.4a. Combustibles 1. Verify the voltage across A to R equals 2 volt. If not, adjust volts potentiometer R11 • The 4105-XX has 4 fixed ranges of sensitivity, which are selectable via JP1. 2. Verify the voltage from GND (TB2) to VOUT equals 0.4 volts. If not adjust BAL potentiometer (R2) • The JP1 positions are labeled 1, 2, 3 & 4. • JP1 jumper set the coarse up scale SPAN values by affecting the gain of the analog circuit.
Instruction Manual 7. INSTALLATION 7.1 Sensor Locations Select locations for each of the sensors based on the following: - Consider the density of the gas to determine height of sensor above floor or ground level. - Sensors should be placed close to the potential source of gas. - Sensors should be placed in areas accessible for calibration. Sensors may be mounted directly onto the end of a vertical conduit, or bracketed to a vertical surface using the two mounting flanges.
Instruction Manual V OUT VOU T P1 R I BB ON C AB LE T O C PU ASS Y. P1 R IB BON C ABL E T O CP U AS SY. U2 U2 R T B2 U1 Pwr./Sig. J P1 BA L C A T B1 TB 2 R1 1 U1 Pw r./Sig. Black Brown Red U3 U5 R C TB 1 Sensor 1 2 3 4 V O LT S R2 U7 S Sensor 1 2 3 4 R 19 A B JP 2 JP 1 U5 Black Red White U4 U4 VOU T P1 R IB BON C ABL E T O CP U AS SY. Combustible ST-46A/EC I/O PCB FOR ELECTROCHEMICAL SENSORS R 19 U2 Toxics U7 S TB 2 R Pw r./Sig.
Instruction Manual 8. SPECIFICATIONS Model 4105-02 4105-03 4105-04 4105-05 4105-06 4105-07 4105-10 Comb. O2 CO H2S Cl2 H2 SO2 Catalytic E.C. E.C. E.C E.C. E.C. E.C. Units %LEL % Vol ppm ppm ppm ppm ppm Range 0-100 0-25% 0-1000 0-100 0-10 0-1000 0-100 Resolution 3% F.S. 0.1% F.S. 1 0.1 0.1 2 0.5 Response Time to 90% of signal Note 1 10 sec. 25 sec. 30 sec. 60 sec. 30 sec. 20 sec.
Instruction Manual 8. SPECIFICATIONS (Continued) 4105-12 4105-21 4105-22 4105-25 3 4105-26 3 NO2 HCL HCN NH HF Sensor Type E.C. E.C. E.C. E.C. E.C. Units ppm ppm ppm ppm ppm Range 0-20 0-20 0-20 0-50 0-10 Resolution 0.2 0.5 0.1 0.1 0.5 35 sec. 150 sec 70 sec. 45 sec. 30 sec.
Instruction Manual 8. SPECIFICATIONS (Cont.) Cross Sensitivities (toxic sensors) Model Number Gas Type Reading from 100 ppm of interfering gas Cl2 H2 SO 2 NO2 CO H2S NO HCl 4105-04 CO 100 315 -15 <40 50 -55 30 4105-05 H 2S <0.5 100 -20 <0.
Instruction Manual 9.
Instruction Manual Appendix A: Unity Gain Mode The Unity magnetic control is available during CAL MODE to allow the ZERO and SPAN adjustments to be centered within their range. This is similar to setting a potentiometer so the wiper terminal is exactly halfway between the clockwise and counterclockwise terminals. this is identified as the UNITY GAIN mode. In UNITY GAIN the ZERO controls have a ± 15% of full scale adjustment range.
Instruction Manual Appendix C: Combustible Gas Scaling Factors (Table 1) Where possible, calibration gas should be the same as the gas to be detected. If this is not possible then a scaling factor should be used to determine the “equivalent value” of the calibration gas in terms of the gas to be detected. (Note: Concentration of calibration gas must be less than the factor number listed on Table 1).
Instruction Manual COMBUSTIBLE GAS SCALING FACTORS For combustible gas monitoring, a calibration standard of Methane or Propane my be used in conjunction with scaling factors to cause alarm function in %LEL scale of another gas as follows: GAS Acetaldehyde Acetic Acid Acetic Anhydride Acetone Acetylene Alkyl Alcohol Ammonia n-Amyl Alcohol Aniline Benzene Biphenyl 1,3-Butadiene n-Butane iso-Butane Butene-1 cis-Butene-2 trans-Butene-2 n-Butyl Alcohol iso-Butyl Alcohol tert-Butyl-Alcohol n-Butyl Benzene iso-B
