Det-Tronics 505 Instruction Manual
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Det-Tronics 505 Instruction Manual

Combustible gas transmitter
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Instructions
95-8472
Combustible Gas Transmitter
Model 505
1.0
03/03
95-8472

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Summary of Contents for Det-Tronics 505

  • Page 1 Instructions 95-8472 Combustible Gas Transmitter Model 505 03/03 95-8472...

  • Page 2: Table Of Contents

    Sensor Voltage Adjustment ........4 Figure 3 Location of Switches and Potentiometers Replacing an Existing K Series or Model 500 on Transmitter Circuit Board ......5 Transmitter with a Model 505 ......5 Figure 4 Transmitter DC Current Output ....8 STARTUP PROCEDURE..........5 Figure 5 Typical Response of a Catalytic Sensor CALIBRATION ..............6...
  • Page 3 The use of other trouble conditions, and outputs for controlling lubricants is not recommended, since some response devices. Other control systems are also compatible with the Model 505. © Detector Electronics Corporation 2003 3/03 95-8472-01...

  • Page 4: Section I - Installation And Startup

    Maximum wire size accepted by the anticipated. Model 505 wire terminals is 12 AWG (2.5 mm 2 ). It is acceptable to power the Model 505 from a 24 vdc 4. The sensor should be located in an area where it is...

  • Page 5: Model 505 Wiring

    For maximum EMI/RFI protection, it is preferable to 3. THE TRANSMITTER JUNCTION BOX SHOULD BE ELECTRICALLY CONNECTED TO mount the sensor directly to the Model 505 junction box. EARTH GROUND. However, in many cases it is desirable to locate the 4.

  • Page 6: Sensor Voltage Adjustment

    The sensor supply voltage Always measure the sensor voltage whenever utilizing a sensor separation kit, and any time a Model 505 potentiometer is adjusted at the factory to deliver 3.3 volts when the sensor is coupled directly to the transmitter has been replaced! Failure to deliver 3.3...

  • Page 7: Replacing An Existing K Series Or Model 500 Transmitter With A Model 505

    20 ma when power is first applied. 6. Install the new Model 505 transmitter board in the junction box. The mounting hole pattern of the 2. Double check all internal and external wiring for transmitter board should match the holes in the proper connections.

  • Page 8: Calibration

    In general, The Span (gain) control adjusts the Model 505 signal the more frequently a system is checked, the greater output (% LFL reading) to match the LFL percentage of the reliability.
  • Page 9 1. Use formula: C x K = S 3. Calibrate the Model 505 for a reading of 0.65 vdc C = Concentration of calibration gas in % LFL = 50 on the voltmeter with a calibration mixture of 50% K = K-factor from Table 1 in GTN01 = 1.44 LFL methane applied to the sensor.

  • Page 10: Section Ii - Description And Operating Characteristics

    For data on other gases, refer to NFPA Handbook DESCRIPTION 325M. The Model 505 Transmitter is used with one constant Typical alarm setpoints for combustible gas detection voltage catalytic gas sensor to provide a linear 4 to 20 systems are 20% LFL for the low alarm and 40% LFL for ma output signal corresponding to a 0 to 100% LFL gas the high alarm.

  • Page 11: Typical Response Of A Catalytic Sensor

    CONTROLLER DISPLAY READING (%LFL) LOWER FLAMMABLE LIMIT (100% LFL) UPPER FLAMMABLE LIMIT PERCENT OF METHANE (BY VOLUME) C1125 Figure 5—Typical Response of a Catalytic Sensor over a Range of 0 to 100% Methane by Volume 90% LFL METHANE IN STANDARD AIR 4.5% METHANE 50% LFL METHANE IN STANDARD AIR 2.5% METHANE...

  • Page 12: Factors Affecting Sensor Sensitivity

    FACTORS AFFECTING SENSOR Boron trifluoride SENSITIVITY Phosphate esters Silicone oils and greases There are a variety of factors that can cause a decrease RTV silicone sealants in the sensitivity of catalytic type combustible gas sensors. The following information identifies the most Some substances react with the catalytic element metal, common substances that can have a detrimental effect forming a volatile compound.

  • Page 13: Dimensions Of Transmitter Junction Box

    Less than ± 0.5 ma signal output variation with a 5 watt, Linear 4 to 20 milliamperes. 157 Mhz or 451 Mhz walkie-talkie keyed at distances greater than 1 foot from Model 505 with junction box CURRENT LEVEL— cover installed.

  • Page 14: Catalytic Sensor

    CERTIFICATION— (3.8) (5.2) FMRC: Refer to Appendix A for FM Approval. CSA: Refer to Appendix B for CSA Certification. CENELEC: Refer to Appendix C for CENELEC Certification information. (4.4) CATALYTIC SENSOR TEMPERATURE RANGE*— –67°F to +302°F (–55°C to + 150°C). 3/4 INCH STANDARD PIPE THREAD D1213...

  • Page 15: Routine Maintenance

    Refer to Table 2, “Calibration Procedure” for information regarding ROUTINE MAINTENANCE calibration and sensor sensitivity. The Model 505 Transmitter requires no routine maintenance, except for periodic checks to ensure SENSOR REPLACEMENT proper calibration. The frequency of these checks is...

  • Page 16: Replacement Parts

    perform the calibration procedure described in the ORDERING INFORMATION “Calibration” section of this manual. When ordering please specify: 5. For the highest degree of calibration accuracy, TRANSMITTER perform a second calibration after 24 hours. Specify: A Recommended Test Form is supplied at the back of this manual for recording maintenance performed on Material: the system.

  • Page 17: Calibration Kits And Replacement Cylinders

    CALIBRATION KITS AND REPLACEMENT CYLINDERS Specify gas type and concentration. For assistance in ordering a system to fit your application, please contact: Detector Electronics Corporation 6901 West 110th Street Minneapolis, Minnesota 55438 USA Operator: (952) 941-5665 or (800) 765-FIRE Customer Service: (952) 946-6491 Fax: (952) 829-8750 Web site: www.detronics.com E-mail: detronics@detronics.com...

  • Page 18: Model

    Detector Electronics combustible gas detection K factors are not FM verified. NOTE Metric straight thread types are for use in non-North American applications. CALIBRATION • Calibration of the above listed sensors has been FM verified using the Det-Tronics 225130-001 (50% LFL methane) Calibration Kit.
  • Page 19 Detector Electronics combustible gas detection K factors are not CSA verified. NOTE Metric straight thread types are for use in non-North American applications. CALIBRATION • Calibration of the above listed sensors has been CSA verified using the Det-Tronics 225130-001 (50% LFL methane) Calibration Kit. 95-8472...
  • Page 20 Electromagnetic compatibility – 89/336/EEC. ATEX – 94/9/EC. The Model 505 Series Combustible Gas Transmitter was tested and found to be compliant with EN50270 when wired in conduit or with shielded cable. All screen drains shall be terminated to the chassis.
  • Page 21 CATALYTIC COMBUSTIBLE GAS SENSOR (CGS) CE 0539 II 2 G EEx d IIC T3, T5 DEMKO 02 ATEX 131323 X T5 (T = –40°C to +75°C) T3 (T = –55°C to +125°C). Special Conditions for Safe Use of CGS — The performance ambient temperature rating is limited to –40°C to +75°C.
  • Page 23 Recommended Test Form Detector Detector Date Date Date Remarks Number Location Installed Checked Calibrated 95-8472...
  • Page 24 Fault Record Sheet Detector Date Time System Status Operator Comments Affected...
  • Page 25 Safety System Det-Tronics, the DET-TRONICS logo, Eagle Quantum Premier, and Eclipse are registered trademarks or trademarks of Detector Electronics Corporation in the United States, other countries, or both. Other company, product, or service names may be trademarks or service marks of others.

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