Related Manuals for Crowcon Flamgard-Plus
Summary of Contents for Crowcon Flamgard-Plus
- Page 1 Flamgard-Plus Flameproof Flammable Gas Detector Installation, Operation and Maintenance Instructions M07192 Issue 7 March 2015...
- Page 3 Plus provides a 4-20 mA signal (sink or source) proportional to the gas concentration and can also be fitted with optional alarm and fault relays. For a list of flammable gases that can be detected, please contact Crowcon. 1.2 Product description Flamgard Plus comprises four parts;...
- Page 4 Introduction Flamgard-Plus 115 (4 ") SET BALANCE SET BRIDGE POT ‘B’ VOLTS POT ‘A’ TAMPER PROOF UNITS TEST TEST GRUB SCREW POINTS ‘A’ POINTS ‘B’ M20 ( NTP) / " (1.5mm ALLEN KEY) CABLE ENTRY LOCAL DISPLAY M20 (½" NTP)
- Page 5 Flamgard-Plus Introduction REAR VIEW OF AMPLIFIER RANGE ALARM OUTPUT OUTPUT OPTIONS TEST INHIBIT POINT 40-200mV 17 4 RELAY CONTACT CONTACT REVERSING ALARM 2 LINKS ALARM 1 ISOLATE LINK FAULT ALARM1 ISOLATE ALARM SET POTS NOT USED ON OXYGEN FLAMGARD PLUS...
- Page 6 Introduction Flamgard-Plus 1.3 Status Indication Flamgard Plus includes a local display and status LED, visible through the junction box window. This is shown in Diagram 1. The display shows the current flammable gas concentration in the range 0-100%LEL and current mode of operation ie NORMAL, ZERO or CAL.
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Page 7: Detector Configuration
Flamgard-Plus Detector configuration 2. Detector configuration 2.1 Standard configuration As standard, Flamgard-Plus is factory set as follows: Current source with 0 mA = Fault 2 mA = Inhibit ie. Zero/Cal mode 4-20 mA = Normal operation 24 mA = Over-range clamp... -
Page 8: Installation
flammable gas detectors: • To detect gases which are lighter than air (eg methane), detectors should be mounted at high level and Crowcon recommend the use of a collector cone (Part No. C01051). • To detect heavier than air gases (eg butane), detectors should be mounted at low level. - Page 9 Cabling to Flamgard Plus must be in accordance with the recognised standards of the appropriate authority in the country concerned and meet the electrical requirements of the detector. Crowcon recommend the use of steel wire armoured (SWA) cable and suitable explosion proof glands must be used.
- Page 10 Installation Flamgard-Plus Table 2 shows maximum cable distances given typical cable parameters. Resistance (Ohms per km) Max. distance mm 2 (awg) Cable Loop m (ft) 1.0 (17) 18.1 36.2 1000 (3280) 1.5 (15) 12.1 24.2 1500 (4920) Table 2: Maximum cable distances for typical cables Acceptable cross sectional area of cable is 0.5 to 1.5 mm 2 .
- Page 11 Flamgard-Plus Installation All electrical connections to the optional relays are made via the 6-way terminal block on the terminal board in the base of the junction box (see Diagram 2). The relay contacts are rated 1 A @ 30 Vdc.
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Page 12: Operation
CAL will illuminate. Other indications remain unchanged. i Apply calibration gas to the detector at a flow rate of 0.5 litres/min. Crowcon recommend 50% LEL gas for calibration purposes (contact Crowcon for the supply of calibration gas.) - Page 13 Note: Always return the detector to NORMAL mode to avoid leaving the detector in a permanently inhibited state. Note: ATEX certified Flamgard-Plus flammable gas detectors will be supplied calibrated for compliance with EN60079-20-1 (where for example 100% LEL methane = 4.4% volume). UL certified detectors will be supplied calibrated for compliance with North American standards (where 100% LEL methane = 5% volume).
- Page 14 Unscrew the complete 96HD sensor housing from the junction box. Note: If a spare 96HD sensor housing complete with new sensor is available ignore steps f to k and return the old 96HD to Crowcon or an approved service centre for repair.
- Page 15 Flamgard-Plus Operation 4 OFF M4 X 12MM ALLEN HEAD SCREWS TOP CAP & SENSOR PCB NEOPRENE GASKET 1 (Part No MO4452) PELLISTOR GASKET 2 (Part No MO4128) SLEEVE MAIN BODY SINTER ASSEMBLY (Part No SO1781) SINTER Diagram 4: 96HD assembly k Re-assemble the 96HD housing taking time to ensure that the 3 mm Allen head screws are securely fixed into position.
- Page 16 Operation Flamgard-Plus o Using a DVM measure the voltage across Test Points ‘A’ and adjust Set Bridge Volts (Pot A) until the DVM reads correctly (see Table 3 for complete list). p Using a DVM measure the voltage across Test Points ‘B’ and adjust Set Balance (Pot B) until the DVM reads 0 mV.
- Page 17 Operation 4.4 Changing Alarm Levels (Relay Version Only) WARNING This work should be carried out by Crowcon or an approved service centre unless suitable training has been received. Before attempting to change alarm levels ensure the detector is in fresh air and no flammable gas is present.
- Page 18 Operation Flamgard-Plus l Check that the detector operates correctly by applying test gas as necessary. m Switch off and isolate power to the detector. n Reset jumpers which may have been changed in step ‘d’ above. o Replace the amplifier and close the junction box, ensuring that all screws have been re-fitted correctly.
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Page 19: Spare Parts And Accessories
Relay board S01847 Loctite No. 243 Contact Crowcon Calibration gas Contact Crowcon *1 Flamgard-Plus may be fitted with a range of pellistor sensors depending on the specific application. The correct spare sensor part number is itemised on the sensor housing label. -
Page 20: Specifications
Specifications Flamgard-Plus 6. Specifications Dimensions 200 x 115 x 115 mm (8” x 41/2” x 41/2”) Weight 2.2 kg (4.8 lbs) Material 96HD sensor housing: 316 Stainless steel Junction box: Marine grade alloy Temperature range -10°C to +55°C (14°F to 131°F)
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