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General Monitors S104 Instruction Manual

Combustible gas enhanced smart sensor
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GENERAL MONITORS
Model S104
Model S104
Combustible Gas
Enhanced Smart Sensor
The information and technical data disclosed
in this document may be used and
disseminated only for the purposes and to
the extent specifically authorized in writing
by General Monitors.
Instruction Manual
General Monitors reserves the right to
change published specifications and designs
without prior notice.
Part No.
Revision
04/97
MANS104
J/04-97

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Summary of Contents for General Monitors S104

  • Page 1 General Monitors. Instruction Manual 04/97 General Monitors reserves the right to change published specifications and designs without prior notice. Part No. MANS104 Revision...
  • Page 2 GENERAL MONITORS Model S104 Warranty General Monitors warrants the Model S104 All warranties are contingent upon proper use to be free from defects in workmanship or in the application for which the product was material under normal use and service within intended and do not cover products which two (2) years from the date of shipment.

  • Page 3: Table Of Contents

    GENERAL MONITORS Model S104 Table Contents Page Number Warranty Warning - Electrostatic Damage 1.0 Introduction General Description Features and Benefits Applications 2.0 Sensor Assembly Sensor Signal Processing Power Supply Control Electronics 3.0 Installation Receipt of Equipment Sensor Location Considerations Installation Instructions...
  • Page 4 GENERAL MONITORS Model S104 Table of Figures Page Number Figure 1 Combustible Gas Sensor Diagram Figure 2 Input Signal Circuit Flow Diagram Figure 3 Power Supply Circuit Flow Diagram Figure 4 Control Electronics Flow Diagram Figure 5 Overall and Mounting Dimensions...

  • Page 5: Introduction

    GENERAL MONITORS Model S104 1.0 Introduction 1.1 General Description 1.3 Applications The Model S104 Enhanced Smart Sensor as- This is a partial listing of applications. sembly is used to detect combustible gases. The microprocessor based electronics, which Drilling and Production Platforms...

  • Page 6: Sensor Assembly

    GENERAL MONITORS Model S104 2.0 Sensor Assembly 2.1 Sensor Signal Processing General Monitors uses a low temperature By connecting one end of each catalytic bead catalytic bead to detect the presence of com- together, a series circuit is formed. This cir- bustible gases.

  • Page 7: Power Supply

    GENERAL MONITORS Model S104 Sensor Assembly 2.2 Power Supply The Model S104 operates from a +24 VDC (nominal) input. This unregulated source is fed to a converter board that produces volt- ages (see figure 3). These signals are the source for operating all of the circuitry on the control and the display boards, and supplying the sensor with power.

  • Page 8: Installation

    Heavy metals, (e.g. Tetraethyl Lead) taminating substances. Although the Model S104 is RFI resistant, it should not be The presence of poisons and contaminants in mounted in close proximity to radio transmit- an area does not necessarily preclude the use ters or similar equipment.

  • Page 9: Installation Instructions

    Sensors used in these areas usually require The overall and mounting dimensions for the more frequent calibration checks than normal, Model S104 (figures 5 & 20) should be used and typically have a shorter life. In many when making installation determinations. A...

  • Page 10: Terminal Connections

    (RTV silicone), the warranty will be void. the sensor body. Once correctly installed, the Model S104 re- General Monitors recommends that the com- quires little or no maintenance other than peri- plete system, including all alarm circuitry, be odic calibration checks to ensure system tested at least annually.
  • Page 11 Model S104. The terminal block accepts 16 vides for control room or other locations re- AWG to 22 AWG stranded or solid wire. mote to the Model S104 to display indications Each wire should be stripped before wiring of operation and alarm conditions.

  • Page 12: Applying Power

    See Appendix, section 5.4. The maximum distance between the Model S104 and the power supply is 4500 feet (1372 The Model S104 Enhanced Smart Sensor op- meters). See the Appendix (section 5.1.2) for erates on a nominal power of +24 VDC. Pri- cable length specifications.

  • Page 13: Maintaining The X/P Integrity

    Model S104 Housing: An S104 without a display will have the fol- lowing items placed in the remaining three Strength of the enclosure material entry holes:...

  • Page 14: Operation

    Zero Air. If when using a General Monitors Readout/Re- Zero Air is not available, cover the sensor lay Display Module with the Model S104. for about thirty seconds before applying the calibration gas. Zero Air is air that is General Monitors recommends that the Model hydrocarbon free.
  • Page 15 “AC” to “CP” (figure 14) indicating that seconds after initiating the calibration se- the sensor is responding to the calibration quence. If the Model S104 is placed in the gas. Calibration Mode and no gas is applied for six minutes, the unit will revert to a Fault condi- tion.
  • Page 16 10% LEL before the unit will complete the ONLY the % LEL of Acetone. The indicated test sequence. If the Model S104 is placed in measures of volatile liquids in the next column the Test Gas Mode and no gas is applied for produces 50% LEL vapor mixtures at 75°...

  • Page 17: Digital Display Codes

    Model S104 Operation 4.2 Digital Display Codes Volatile liquids are not supplied by General Monitors. Below is a list of volatile liquids and the volume required The following codes will appear on the dis- (in microliters) to produce 50% LEL in the 3 liter chamber.

  • Page 18: Fault Codes & Their Remedies

    Gas Present - If the magnet was applied with F7,F8,F9 For more information about these a high level of gas present, the Model S104 codes, refer to Section 4.3 Fault will not be able to obtain a valid ZERO. AC- Codes &...
  • Page 19 ACTION - Check the WHITE and RED wires F9 = Calibration Check Period Exceeded or replace the sensor as appropriate. If the Model S104 is left in the Test Gas Mode for more than six minutes without a Test Gas F6 = Low Supply Voltage being applied, this fault will occur.

  • Page 20: Appendix 5.1 Specifications

    Recommend Three Wire Shielded Cable: DC120 X/P Dual Channel Display Maximum distance between the Model DC130 Dual Channel Display S104 and the power source. TA102A Single Channel, 02 Series Feet Meters Fault Conditions Monitored: Low DC Supply, Sensor Bead Open, 1100 Calib.

  • Page 21: Mechanical Specifications

    GENERAL MONITORS Model S104 Appendix 5.1.3 Mechanical Specifications Weight (approx) 5.5 LB 2.5 kg Length 6.34" 161 mm Height (w/bolts) 3.40" 86 mm Width at the base 4.10" 104 mm Between mounting hole centers 5.00" 127 mm Between outside edges of mounting flanges 6.00"...

  • Page 22: Engineering Documentation

    If the calibra- tion switch is not present, it will be replaced with a housing entry plug. If the Model S104 is or- dered with a display, the TB1 des- ignations for positions 2, 3, 4 & 5 will not be used.
  • Page 23 GENERAL MONITORS Model S104 Appendix NOTE: The Calibration Switch is only available on the Model S104 without a display. If the calibration switch is not present, it will be replaced with a housing entry plug. figure 20...

  • Page 24: Termination & Outline Drawing - Ce Marked Unit

    GENERAL MONITORS Model S104 Appendix 5.2.2 Termination & Outline Drawings CE Marked Unit figure 21...

  • Page 25: Ordering Information

    Appendix 5.3 Ordering Information 5.3.1 Configuration Codes The standard configuration for the Model S104 is: S104 - 3 0 0 - 1 01 - 1 0 1 S104 - 3 0 0 - Calibration Signal: 1 = 1.5 mA.......(standard) 2 = 0.0 mA...

  • Page 26: Spare Parts And Accessories

    GENERAL MONITORS Model S104 Appendix 5.3.2 Spare Parts & Accessories To order spare parts and/or accessories, please Sensor Housing: contact your nearest General Monitors Repre- 10252 Universal Housing sentative or General Monitors directly and give the following information: Sensor Accessories:...
  • Page 27 GENERAL MONITORS Model S104 Appendix Calibration Equipment ( Smart Sensor (S104) Replacement Parts: continued 928-700 Dish for the 3 liter Chamber 30441-1 Control Board Electronics 928-715 250 microliter syringe 30261-1 Converter Board Electronics 1400150-M Portable Purge Calibrator, 30080-1 Display Board Electronics...

  • Page 28: Fmrc Approval

    Approval of the transmitter does not include Factory Mutual Research Corporation has or imply approval of apparatus to which the tested the Model S104 according to the crite- transmitter may be connected and which proc- ria listed under FMRC Approval Standards...

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