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Summary of Contents for Rae FMC-40
- Page 1 Manual No.AWK043-4 C922 FMC - 40 OPERATING HANDBOOK...
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Page 2: Table Of Contents
Contents Description........................3-4 Technical Specification ....................5 Installation ........................6-7 Commissioning ......................8-10 Service - Routine Attention ..................10 Table of Lower Explosive Limits ................13 ILLUSTRATIONS 1 Front View - Controls.................... 14 2 Mother Board Detail and Field Terminals ..............15 3 Alarm Board - Component Layout ................16 4 Sensor Termination....................17 SYSTEM DATA Manufacture date: -... -
Page 3: Description
DESCRIPTION The FMC-40 is a multi channel combustible and toxic gas monitor, which can accommodate up to 4 sensor channels housed in wall mounting enclosure. Sensors may be added or removed as required, but should be carried out with the power to the unit switched off. Each sensor continuously monitors for gas, with the digital display sequentially sampling each sensor reading. - Page 4 SPAN POTENTIOMETER used to adjust the meter indication to read correctly when the sensor is subject to a test gas of known concentration. ALARM SET SWITCH alarm trip points setting. SENSOR CURRENT POTENTIOMETER sensor supply adjustment.
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Page 5: Technical Specification
Technical specification NUMBER OF CHANNELS One, Two, Three or Four channels OUTPUTS Common Relays - user selectable High alarm RL2 - D.P.C.O. normally energised or de-energised - factory set de-energised Latched or unlatched - factory set latched Low alarm RL1 - D.P.C.O. normally energised or de-energised - factory set de-energised Latched or unlatched - factory set latched Fault alarm RL3 - S.P.C.O. -
Page 6: Installation
Installation The FMC-40 Series control instrumentation is designed for installation in a safe area only. Siting of the instrument should be chosen with regard to the following points: (a) Cable within the enclosure should be cut back to the minimum length and having been terminated should be kept away from electronic components and the ribbon cable. - Page 7 Ventilation of the room will of course alter the situation significantly but it should be remembered that if the ventilator is not at ceiling level, a dangerous concentration can still occur between the top of the ventilator and the ceiling. For heavier than air gases such as propane or butane, the formation of dangerous layers occurs at ground level.
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Page 8: Commissioning
Commissioning Before applying power to the instrument ensure that all detector heads are connected to the sensor terminals on the printed circuit board (fig 2) and that each detector head is connected to its appropriate channel, identified by a small circular, coloured label: WARNING –... - Page 9 CALIBRATION WHEN USING CV TRANSMITTER (4~20mA DEVICE) Where a transmitter has been supplied the setting up procedure as described on page 18 or 19 should be followed. The standard transmitter for toxic sensors is supplied as a two wire device set in a loop powered mode, and the flammable sensor is supplied as a three wire device.
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Page 10: Service - Routine Attention
RANGE & SCALE SELECTION The range and scale reading is normally factory set but where a sensor alarm board is to be added the following selections should be made on the display board PCN037. Note: Power to the system should be off when adding or removing a sensor board. RANGE 1. - Page 11 FAULT DIAGNOSIS Unable to zero meter 1. Sensor open circuit 2. Sensor leads incorrectly connected 3. Alarm card not positioned correctly No front panel indication - Check ribbon cable is connected correctly ACTION TO BE TAKEN IF THE APPARATUS ALARM SOUNDS: - A Extinguish all naked flames, including all smoking materials.
- Page 12 Fig 1 FMC-40 %LEL %VOL Test Reset Hold Range Indicator - L.E.L. Lower Explosive Limit Parts Per Million % vol. % Volume High Alarm Low Alarm C 1 -C 4 Channel Selection (Sensor) Fault Indicator Power On (Green) Mains Fail (Red)
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Page 13: Table Of Lower Explosive Limits
Fig 2 Mother Board Relay Selection Common High Relay - Normally energised/Normally de-energised - (J3) Common Low Relay - Normally energised/Normally de-energised - (J1) Common Fault Relay - Normally energised/Normally de-energised - (J5) Sounder Permanent Mute - JP10 remove Standby Battery - Connect leads to - (JP11 and JP12) -
Page 14: Front View - Controls
RV1 - Sensor Zero Potentiometer RV2 - Sensor Calibration Potentiometer RV3 - 4~20mA signal output - 4mA adjust Potentiometer RV4 - 4~20mA signal output - 20mA adjust Potentiometer RV5 - FMC-40 display span (factory set) Potentiometer RV6 - Sensor Supply... -
Page 15: Mother Board Detail And Field Terminals
Fig 4 SENSOR – 3 WIRE Gas Detector Detector Head Control Unit mV (pellistors) or 3 wire CV Y SIG Sensor SENSOR – 2 WIRE Gas Detector Control Unit Transmitter Y SIG Sensor INFRA RED SENSOR – 3 WIRE Gas Detector Control Unit Transmitter 24V +...
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