Gasflag Manual - Crowcon Detection Instruments
Contents
1. ACTION RELAY LED BUZZER INDICATION INDICATION INDICATION OK Not active No alarm LEDs No sound Increasing gas levels or reducing if oxygen sensor L and N Gas level gt Alarm 1 Alarm 1 Alarm 1 LED Sound Press ACCEPT RESET Alarm 1 Alarm 1 LED No sound Gas level gt Alarm 2 Alarm 1 and2 Alarm 1 amp 2 LEDs Sound Press ACCEPT RESET Alarm1 and 2 Alarm 1 and 2 LEDs No sound Gas level gt full scale Fault Fault LED 1 Hz beep range Press ACCEPT RESET Fault Fault LED No sound Reducing gas levels or increasing if oxygen sensor L tGas level lt full scale Alarm 1 and 2 Alarm 1 and 2 LEDs No sound N range L Gas level lt Alarm 2 Alarm 1 and 2 Alarm 1 and 2 LEDs No sound L Press ACCEPT RESET Alarm 1 Alarm 1 LED No sound N Gas level lt Alarm 2 Alarm 1 Alarm 1 LED No sound L Gas level lt Alarm 1 Alarm 1 Alarm 1 LED No sound L Press ACCEPT RESET Not active No alarm LEDs No sound N Gas level lt Alarm 1 Not active No alarm LEDs No sound t This condition will only arise if the output below 23 5 mA 4 1 Fault condition If the Gasflag senses a fault from a short or open circuit condition the Fault Relay will change state the Fault LED will illuminate and the BUZZER will sound a 1 Hz bleep The fault alarm is non latching and will return to normal if the fault conditio n clears rom the detector is NOT clamped 5 DAISY CHAINING MULTIPLE GASFLAG CONTROL PAN ELS A number o2. gt CROWCON Gasflag Single Channel Control Panel Alarm Only Apparatus Gasflag Installation operating and maintenance instructions M07225 Issue 2 1 07 05 Crowcon Detection Instruments Ltd 2 Blacklands Way Abingdon Business Park Abingdon OXON OX14 1DY 1 INTRODUCTION 1 1 Description The Gasflag is a single channel control panel designed to monitor remote 4 20 mA gas detectors The Gasflag is an alarm only apparatus providing two independent user configurable alarm relays which can be used to control external visual or audible alarms The Gasflag is designed to work in safe areas only but can be used to monitor gas levels in hazardous areas using a suitable detector The Gasflag does not require calibration and has been designed for one man installation The Gasflag consists of a single shell with a front panel containing a ACCEPT RESET switch and four illuminating LEDs e POWER HEALTHY green LED Indicates the system is running If this LED is extinguished the system is not running e SYSTEM FAULT yellow LED When illuminated indicates there is a system fault e ALARM 1 red LED When illuminated indicates alarm level 1 is exceeded e ALARM 2 red LED When illuminated indicates alarm level 2 is exceeded The Gasflag contains two PCBs The RELAY PCB is located in the back of the shell on the right hand side This board contains the relays and electrical connections The second PCB is
3. located in the lid of the shell on the left hand side This CONTROL PCB contains the links to configure the Gasflag the test points for attaching a Digital Volt Meter DVM and alarm level adjustment potentiometers The RELAY PCB contains the electrical connections for POWER IN POWER OUT for daisy chaining Gasflag units and SENSOR It also provides volt free contacts for Alarm 1 Alarm 2 and Fault anda screwdriver for adjusting the alarm levels All connections and earth settings are clearly labeled on the PCB The Gasflag is supplied with a 50 60 Hz ac power supply unit of 230 V input E01777 and 110 V input E01782 The power supplies have red and black terminals for connecting to the Gasflag and provide 13 to 28 V dc supply The power supplies are suitable for powering up to two Gasflag control panels 2 INSTALLATION When carrying out any installation work ensure that local regulations and site procedures are followed 2 1 Mounting The Gasflag control unit is designed for wall mounting in a non hazardous location and is suitable for indoor environments in light industrial or commercial use Fixing holes are provided to attach the unit The Gasflag is not suitable for outdoor or hazardous environments 2 2 Cabling requirements Cabling to Gasflag must be in accordance with the recognised standards of the appropriate authority in the country concerned and must also meet the electrical requirements of the unit Crowcon r
4. When an alarm level is exceeded and has been configured as LATCHED the alarm relay will switch state and remain in that state until the control panel is reset even if the gas level falls to normal values A NON LATCHED alarm relay will switch state when the alarm level is exceeded but will return to normal if the gas level returns to normal LINKS 16 and 18 set the Gasflag configuration for ALARM 1 and 2 the links should be set to A for NON LATCHING or B for LATCHING 3 2 2 Alarm and fault relay settings The fault relay will change state if the current level in the detector loop drops below 3 mA or rises above 23 5 mA The relays can be configured to work as NORMAL de energised or FAILSAFE energised Typical configuration is to set ALARM 1 and 2 as NORMAL LINKS 12 and 13 to A and FAULT as FAILSAFE LINK 14 to B When configuring these settings please ensure that local regulations and site procedures are followed 3 2 3 Alarm buzzer settings The Gasflag control panel default setting for the BUZZER is ENABLED The BUZZER can be disabled using LINK 11 Set this link to A to enable the BUZZER and to B to disable the BUZZER The BUZZER is typically disabled if external alarm devices are added 3 3 Remote alarm devices Audible and visual alarm devices can be connected to the Gasflag control panel from the screw terminal blocks marked ALARM 1 ALARM 2 and FAULT on the RELAY PCB Crowcon can provide a wide range of alarms and indicat
5. ecommends the use of 2 core twisted pair cable The Gasflag requires a dc supply of 13 28 V please refer to local regulations for earthing requirements The power supply provided with the Gasflag control unit is not fitted with an AC plug As Gasflag is a safety device the power supply must be permanently wired to a dedicated AC spur fed from a circuit breaker marked as the disconnecting device for the Gasflag The circuit breaker must comply with the relevant requirements of IEC 947 1 and IEC 947 3 These procedures ensure that the installation complies with the requirements EN 61010 1 Low Voltage Directive Please refer to the gas detector or 4 20 mA device manual for cabling requirements Generally there must be a supply of 10 V at 20 mA to the detector terminals 2 3 Electrical connections Figure 2 1 Electrical connections for 4 20 mA device CONTROL EQUIPMENT CONTROL EQUIPMENT AOsd Ov S L O SOURCE Link 10A 10B in position B SINK Link 10A 10B in position A 3 CONFIGURATION 3 1 Setting alarm levels 1 and 2 The test points for ALARM 1 ALARM 2 and 0 V can be found on the CONTROL PCB The alarm level adjustment potentiometers can be found to the right of the test points marked as VR10 and VR11 A DVM capable of measuring up to 200 mV with at least 10 MQ input resistance is required DO NOT USE a moving coil meter as this will affect the values read leading to inaccurate setting of the trip points R
6. efer to the specification sheet supplied with the unit for the preset alarm settings To set Alarms 1 Connect the negative probe of the DVM to 0 V and positive probe of the DVM to the appropriate alarm test point The alarm range of 4 20 mA is read as 40 200 mV on the DVM 2 Adjust the potentiometer VR10 Alarm 1 and VR11 Alarm 2 to read the desired gas alarm level Alarm mV 160 x alarm level 40 gas range For example if the gas alarm is required at 50 LEL on a 0 100 LEL detector then adjust the setting so that the DVM reads 120 mV equivalent to 12 mA in the detector loop 3 Write the gas type gas range and alarm level value on the sticky label provided on the CONTROL PCB We recommend that both the alarm levels and the mV setting is recorded 3 2 Alarm configuration When you have completed the alarm level settings the next stage is to configure the alarm settings using the links provided on the CONTROL PCB this table can be found printed on the CONTROL PCB 3 2 1 Alarm 1 and Alarm 2 configuration A RISING alarm is suitable for most detectors as a rise in gas level is the most commonly monitored action A FALLING alarm is typically used to monitor oxygen levels as a fall in the oxygen level is most critical LINKS 15 and 17 set the Gasflag configuration for ALARM 1 and 2 The links should be set to A for FALLING or B for RISING The Gasflag alarms can be configured to operate as LATCHED or NON LATCHED
7. f Gasflag control panels can be daisy chained together in series The first Gasflag unit is connected to an external power supply and is subsequently used to supply the power to the next Gasflag unit The 6 total number that can be supported will depend on the power supply rating The Gasflag is supplied with a power supply unit capable of powering up to two Gasflag units If more then two units are to be daisy chained together then a higher rated power supply is needed In the Figure 5 1 electrical connections for connecting two Gasflag units together is shown Figure 5 1 Electrical connections for daisy chaining two Gasflags SUPPLY J1 J2 wW 7m 3 8 zg OF IN PWR OUT PWRIN PWR OUT GASFLAG 1 GASFLAG 2 6 GASFLAG SPECIFICATION Dimensions 145 x 210 x 46 mm Weight lt 500 g Sensor connection Two or three wire connection to sensor via screened cable Operating voltage 13 28 V dc 4 20 type Selectable source or sink Fault current lt 3 MA and gt 23 5 mA Operating temperature 20 C to 70 C 4F to 158 F Humidity 0 99 RH non condensing Trip point hysteresis Alarm hysteresis set at approximately 0 5 mA Fault hysteresis set at approximately 0 2 mA Response time typical Time to alarm lt 1 second Connections Terminals accept cables of cross sectional area 0 5 to 2 5 mm Relay outputs Single pole change ove
8. ors for operation in safe and hazardous areas Contact Crowcon for further details of suitable devices 3 3 4 Power to an external alarm device through the alarm relay The Gasflag control panel can be used to provide the power supply for an external alarm device Figure 3 1 shows the electrical connections required Figure 3 1 Electrical connections for powering an external alarm device BEACON or SOUNDER SUPPLY re gt OF IN OUT ECA 2 3 4 Setting earthing requirements The Gasflag control panel provides flexible earthing arrangements The LINKS 1 and 2 on the RELAY PCB allows earthing configuration for 0 V and SCREEN The links are summarised in the table below Table 3 1 Gasflag earthing configurations LINK A B LK1 Isolate 0 V from earth Link 0 V to earth LK2 Link SCREEN to 0 V Link SCREEN to earth When configuring these settings please ensure that local regulations and site procedures are followed 4 OPERATION Table 4 1 summarises the action of pressing the ACCEPT RESET button onthe ALARM and FAULT RELAYS the LED indication and the BUZZER in the event of gas levels increasing and returning to normal The left column in the lower portion of the table for Reducing gas levels are marked to indicate LATCHING and NON LATCHING system configuration Table 4 1 LATCHING L and NON LATCHING N
9. r for use with dc signals The relay contacts are rated 1 A at 30 V dc Standard Power Supply 15 V DC 500 mA
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