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MODEL 4105 SERIES
GAS SENSOR MODULE
WITH DIGITAL DISPLAY AND
NON-INTRUSIVE CALIBRATION
4-20 mA
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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
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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
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Instruction Manual 1. PRODUCT DESCRIPTION 1.1 Introduction Model 4105 Series Gas Sensor module features non- intrusive 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 in- struments. This manual provides instructions for 4105 series gas sensor modules that utilize common packaging and transmitter electronics with different sensors for de- tecti
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Instruction Manual 2. CAUTIONS WARNINGS & RECOMMENDATIONS Wire Gauge Maximum Length 20 AWG 2,000 Ft. 2.1 INTRODUCTION 18 AWG 3,000 Ft. 16 AWG 4,000 Ft. Although the sensor module is designed and con- 14 AWG 6,500 Ft. structed for installation and operation in industrial 12 AWG 9,000 Ft. applications including “hostile” environments, cau- Table 2.1 tion should be taken to insure that the installation is Recommended Wire/Cable Gauge in compliance with this instruction manual and that certain proc
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Instruction Manual 3. QUICK START 3.1 Overview The gas sensor module has been supplied factory cali- brated and ready for immediate installation and opera- tion. An installer familiar with installation and opera- tion of gas detection products can use this section to begin immediate use of the monitor. PPM 3.2 Wiring MODEL 4105-05 H2S PPM Provide three conductor wiring from the power sup- GAS MONITOR ply/control device to the sensor module location. See FAULT Unity section 2.2 for wiring spec
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Instruction Manual 4. OPERATION 4.1 Introduction Under normal conditions the sensor module does not require operator or technician intervention. The fol- lowing 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. 4.2 Signal Value During normal operation the current loop of the sen-
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Instruction Manual 5. CALIBRATION 5.1 Frequency of Calibration Connect the calibration adapter and expose the sen- The manufacturer recommends that the gas sensor sor to an appropriate SPAN gas using a span mixture module be calibrated every ninety days. containing a known concentration of the gas of inter- est at a minimum flow rate of 300 cc/minute. (Use per- 5.2 Calibration Process meation tube for 4105-25) Allow 3-5 minutes before The output signal of the gas sensor module is cali- making
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Instruction Manual 6. SERVICE 6.3 Transmitter Replacement The transmitter assembly should be replaced when it 6.1 Sensor Module Configuration is determined that it is unreliable, noisy or cannot be The gas sensor module is comprised of the following adjusted for calibration. This may occur due to age, sub assemblies: corrosion or failed components. To replace the transmitter assembly: 4105-XX Gas Sensor Module -SPM25002 Transmitter Assembly 1. Remove the cover of the main enclosure. -SPT25013
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Instruction Manual 6.4a. Combustibles 1. Verify the voltage across A to R equals 2 volt. If • The 4105-XX has 4 fixed ranges of sensitivity, not, adjust volts potentiometer R11 which are selectable via JP1. 2. Verify the voltage from GND (TB2) to VOUT • The JP1 positions are labeled 1, 2, 3 & 4. equals 0.4 volts. If not adjust BAL potentiom- • JP1 jumper set the coarse up scale SPAN values eter (R2) by affecting the gain of the analog circuit. 3. Verify that the voltage at VOUT is equal to
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Instruction Manual 7. INSTALLATION 7.1 Sensor Locations Sensors may be mounted directly onto the end of a Select locations for each of the sensors based on the vertical conduit, or bracketed to a vertical surface us- following: ing the two mounting flanges. Insure that the body of the enclosure is at least 1" from the wall so that the - Consider the density of the gas to determine sensor assembly can be rotated for removal and re- height of sensor above floor or ground level. placement. See F
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Instruction Manual V O U T VO U T P 1 P 1 R IB BO N C AB L E R I BB ON C AB L E R 1 9 T O CP U A S SY . TO C P U AS S Y. U 2 U 7 U 2 S R C R C A TB 2 TB 1 T B 2 T B1 U 1 U 1 Pwr./Sig. Sensor Pwr./Sig. Sensor 1 2 3 4 BA L V OL T S A B 1 2 3 4 Black Black JP 2 JP 1 U 3 R 2 J P 1 R1 1 Red Brown U 5 Red White U 5 U 4 U4 VO U T ST-46A/EC I/O PCB FOR ELECTROCHEMICAL SENSORS P 1 R IB BO N C A B L E R 19 Combustib
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Instruction Manual 8. SPECIFICATIONS Model 4105-02 4105-03 4105-04 4105-05 4105-06 4105-07 4105-10 Gas Comb. O CO H S Cl H SO 2 2 2 2 2 Sensor Type 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 Note 1 10 sec. 25 sec. 30 sec. 60 sec. 30 sec. 20 sec. to 90% of signal 2 Sensor Life 3 Yrs 2 yrs 2 yrs 2 yrs 2 yrs 2 yrs 2 yrs Operating Range o o o o o o o Temper
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Instruction Manual 8. SPECIFICATIONS (Continued) 3 3 Model 4105-12 4105-21 4105-22 4105-25 4105-26 Gas NO HCL HCN NH HF 2 3 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 Response Time 35 sec. 150 sec 70 sec. 45 sec. 30 sec. to 90% of signal 2 Sensor Life 2 yrs 2 yrs 2 yrs N/A N/A Operating Range o o o o o Temperature 14 to 122 F 14 to 122 F 14 to 122 F 14 to 113 F 14 to 113 F o o o o o -10 to 50 C -10 to 50
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Instruction Manual 8. SPECIFICATIONS (Cont.) Cross Sensitivities (toxic sensors) Model Gas Reading from 100 ppm of interfering gas Number Type CO H S Cl H SO NO NO HCl HCN C H 2 2 2 2 2 2 4 4105-04 CO 100 315 -15 <40 50 -55 30 2 40 <50 4105-05 H S <0.5 100 -20 <0.1 <15 -15 0 0 0 0 2 4105-06 Cl 0 <-10 100 0 0 105 0 0 0 0 2 4105-07 H <1 <20 0 100 3 0 35 3 35 85 2 4105-10 SO <1 0 -40 0 100 -100 0 0 15 0 2 4105-12 NO 0 -20 90 0 0 100 0 0 -3 0 2 4105-21 HCl 0 75 -10 0 35 -2 0 100 -8 0 4105-22 HC
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Instruction Manual 9. REPLACEMENT PARTS 4205-02 Sensor Assembly, Combustible, Non-Intrusive 4205-03 Sensor Assembly, 4-20 mA O , Non-Intrusive 2 4207-04 Sensor Assembly, 4-20 mA CO, Non-Intrusive 4205-05 Sensor Assembly, 4-20 mA H S, Non-Intrusive 2 4205-06 Sensor Assembly, 4-20 mA Cl , Non-Intrusive 2 4207-07 Sensor Assembly, 4-20 mA H Non-Intrusive 2, 4207-10 Sensor Assembly, 4-20 mA SO , Non-Intrusive 2 4207-12 Sensor Assembly, 4-20 mA NO , Non-Intrusive 2 4207-21 Sensor Assembly, 4-20 mA H
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Instruction Manual Appendix A: Unity Gain Mode Appendix B: L.C.D. Readout Calibration Procedure The Unity magnetic control is available during CAL The 3 1/2 digit LCD meter span and decimal points MODE to allow the ZERO and SPAN adjustments to be may be configured for full scale ranges such as 1- centered within their range. This is similar to setting a 100, 0-25, 0-10.0, 0-1000 and many others. Zero per- potentiometer so the wiper terminal is exactly halfway cent of full-scale readings, or
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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). The formula for calibration is as follows: Display = (Cal gas) / Factor where: Display = the s
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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 METHANE PROPANE GAS METHANE PROPANE FACTOR FACTOR FACTOR FACTOR Diethyl Ether 46 84 Acetaldehyde 60 109 Dimethoxyethane 42 75 Acetic Acid 54 98 Dimethyl Ether 63 113 Acetic Anhydride 46 83 Dimethylformamide 46 83 Acetone 52 94 Ethyl Formate 44 80 Acetylen
