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Aeroqual Series 930 User Guide 

6. Troubleshooting 

 

Fault Description 

Possible Cause 

Remedy 

No Power 

Power connection broken 

Power supply failure 

S930 damaged 

Reconnect power cable 

Replace 24V power supply 

Replace unit 

RS485 communications 

unstable 

RS485/RS232 adaptor faulty 

Connections broken 

ID incorrect 

Noise on cable 

Sensor head not fitted correctly 

Reconfigure/replace adaptor 

Reconnect leads 

Check ID 

Use shielded twisted pair cable 

Insert head correctly 

4-20mA output failure 

30V input exceeded 

Replace S930 

Network unstable 

ID conflict 

 
Noise on cable 

Jumpers set incorrectly 

930 units too close together 

Modify IDs so that no S930 units share 
the same ID 

Use shielded twisted pair cable 

Set jumpers correctly 

The cables between the S930 units 
should be a minimum of 30 cm in length 

If connected to a display: 

 

Display shows -1 

 
 

 

Display shows 1 

 
 

Display shows -.125 

 

Display oscillated between 

min and max 

 
 
Over-range (>20mA) reverse 
loop current 
 

 
Over-range loop current (>20 
mA) 
 
4-20mA loop not powered 
 

Sensor head not fitted correctly 

 
 
Loop polarity is incorrect. Reverse the 
polarity. Incorrect loop polarity can cause 
irreversible damage to the 930 unit 
 
 
Reduce loop current  
 
 
Power loop. The display requires the 
loop to be powered to read correctly 

Insert sensor correctly 

Sensor failure when new 

sensor connected 

Insufficient warm-up 

Air contaminated 

 
Sensor damaged 

Run the sensor for 24-48 hours 

Move the sensor to cleaner environment 
and check reading 

Replace sensor 

 

Sensor showing high 

baseline reading under 

zero gas conditions 

Background gas level higher 
than normal 

Interference gas present 

 
Sensor zero drift 
 

Sensor damaged 

Move sensor to clean environment and 
recheck baseline 

Move sensor to clean environment and 
recheck baseline 

Rezero sensor in a clean, stable 
environment 

Replace sensor 

Sensor showing higher 

than expected reading in 

the presence of sensor 

gas 

Zero calibration incorrect 

Span calibration incorrect 

Interference gas present 

 
 
Sensor calibration lost 

Zero calibrate sensor 

Span calibrate sensor 

Move sensor to clean environment and 
check reading upon exposure to know 
concentration of gas 

Replace sensor 

 

Содержание 930 Series

Страница 1: ... 900 User Guide Distributed by Air Met Scientific Pty Ltd Work with Confidence Air Met Sales Service P 1800 000 744 F 1800 000 774 E sales airmet com au Air Met Rental P 1300 137 067 E hire airmet com au W www airmet com au ...

Страница 2: ...2 6 Download 5 3 Operation 5 3 1 Description of Outputs 5 3 2 Operation as a Relay Controller 6 3 2 1 Procedure 6 3 3 Operation as a 4 20 mA transmitter 6 3 3 1 Procedure 7 3 4 Operation as a RS485 Transmitter 8 3 4 1 Connecting via RS485 8 3 4 2 Network Settings 8 4 S930 Specifications 9 5 Gas Measurement Guidelines 9 6 Troubleshooting 10 7 Diagnostics 11 8 RS485 Protocol 11 9 Care and Maintenanc...

Страница 3: ...e We recommend recalibration once a year and replacement every two years or when the sensor aging or sensor failure diagnostics appear Sensors require more frequent maintenance if run continuously at site 1 2 Components not supplied but required 24VDC 1A power supply for powering the Series 930 2 Configuration The Series 930 alarm and 4 20mA output scale settings can be configured via the Fixed Mo...

Страница 4: ...twork please ensure each unit has a unique ID otherwise there will be conflicts and data loss 2 2 2 Alarms High alarm and low alarm set points can be configured by entering the required activation set point on the main menu Note The high alarm set point must be greater than low alarm set point The low alarm trigger determines whether low alarm is activated when the concentration goes above or belo...

Страница 5: ...the transistor outputs a back EMF suppression diode must be fitted across the load HiALM This is set to GND when high alarm is activated It is floating at other times Use the Configuration Program to set the Hi alarm set point The output can be used to drive an alarm relay or similar The output is an open collector current sink The maximum rating of the transistor output is 24VDC at 150mA If a rel...

Страница 6: ... e Connect relays to LoALM and or HiALM alarm outputs on the screw connector if required f Power on and test response Note HiALM LoALM and DIAG are also transistor outputs 3 3 Operation as a 4 20 mA transmitter The Series 930 can be connected to a PLC or current sensing device via the 4 20mA output to provide concentration information The output is linearly proportional to concentration The full s...

Страница 7: ... the 4 20mA output may be permanently damaged b Power on the S930 and PLC c Check the PLC or current sensing device to ensure data is being shown Note The 4 20mA outputs are located on the side of the unit as shown in the diagrams below 4 20 mA wiring diagram for Loop without opto isolation 4 20 mA wiring diagram for Loop with opto isolation GND Power Supply 24VDC 4 20mA PLC or Current Meter Power...

Страница 8: ...w connector b Use a twisted pair cable to connect the RS485 lines on the screw connector to the RS485 hub bus or converter c Power up the monitor and run the communication software on your computer or PLC 3 4 2 Network Settings If the S930 is to be used as part of a daisy chained RS485 network a number of settings need to be adjusted Jumper settings The termination resistors need to be set correct...

Страница 9: ...ve heat or cold excessive swings in humidity and gas concentrations outside the range of the specific sensor head Power user supplied 24V DC 500mA range 22 26V DC Analogue output 4 20mA opto isolated 12 24V External signal type Transistor output 150mA max External signals 4 Low Alarm High Alarm Control Diagnostics LED Display Optional Inputs Standby toggle Communication RS485 Aeroqual proprietary ...

Страница 10: ...op current 20 mA 4 20mA loop not powered Sensor head not fitted correctly Loop polarity is incorrect Reverse the polarity Incorrect loop polarity can cause irreversible damage to the 930 unit Reduce loop current Power loop The display requires the loop to be powered to read correctly Insert sensor correctly Sensor failure when new sensor connected Insufficient warm up Air contaminated Sensor damag...

Страница 11: ...led sensor can be sent back to Aeroqual for replacement or disposal The fault conditions are explained in the below table Fault Description DIAG output 4 20mA output RS485 output No fault Floating Valid gas reading Valid gas reading Status 1 0x00 Sensor failure GND 20mA Last valid gas reading Status 1 0x01 Sensor aging GND 20mA Last valid gas reading Status 1 0x02 Sensor not fitted correctly GND O...

Страница 12: ...DATA NETWORK_ID EMPTY CHECKSUM Reply SENSOR GAS_CONC_DATA NETWORK_ID DATA1 TEMP RH RESERVED STATUS1 STATUS2 CHECKSUM DATA1 4 bytes IEEE754 floating point data measured gas value if DATA_UNVALID bit of STATUS1 flag is 1 then it will be last measured value otherwise it s new measured value TEMP 2 bytes unsigned int value its actual value equals the int value divided by 10 TEMP 10 for its real temper...

Страница 13: ...d that can change current 930 unit network ID Command BASE CHANGE_NETWORK_ID OLD_ID NEW_ID CHECKSUM Reply SENSOR CHANGE_NETWORK_ID NEW_ID DATA1 DATA2 RESERVED STATUS1 STATUS2 CHECKSUM CHANGE_NETWORK_ID 1 byte command see section 3 for details OLD_ID the 930 unit old network ID NEW_ID the 930 unit new network ID 06 Specific 930 connected sensor gas unit ppm to mg m3 convert factor and analog curren...

Страница 14: ...NTROL_LOW 4 bytes control low set point value see section 4 for its data representation ALARM_STATUS 1 byte alarm state settings see section 4 for details 09 Specific 930 base unit version number request command and reply PC or other devices can request the base unit version information Command BASE BASE_VERSION NETWORK_ID EMPTY CHECKSUM Reply SENSOR BASE_VERSION NETWORK_ID VERSION_NUM SENSOR_COUN...

Страница 15: ...on 4 Protocol commands value and descriptions BASE 0x55 command header used for network master to 930 SENSOR 0xAA reply header used for 930 to network master STANDBY 0xFD command used to set sensor head standing by mode RESET 0x07 command to reset sensor head to normal working state GAS_CONC_DATA 0x10 command to request report measured gas concentration value TEMP_RH_DATA 0x20 command to request t...

Страница 16: ...D b3 reserved STANDBY b4 1 sensor head in stand by mode b4 0 sensor head in normal working mode RESERVED b5 reserved RESERVED b6 reserved RESERVED b7 reserved ALARM_STATUS 1 Byte used for alarm status setting Alarm_Enable b0 0 930 alarm enabled b0 1 930 alarm disabled Alarm2_Triger b1 0 930 alarm 2 triggered when reading exceed alarm 2 b1 1 930 alarm 2 rigged when reading below alarm 2 Define_Oupu...

Страница 17: ...ity none Flow control none 9 Care and Maintenance Your Aeroqual Monitor is a product of superior design and quality and should be treated with care When using your Aeroqual Monitor Keep it and all its parts and accessories out of the reach of small children Keep it dry Avoid water and or condensation as humidity and liquids may damage sensitive electronics and the Li battery Do not use or store in...

Страница 18: ...uyer acknowledges that they are granted a perpetual non exclusive non transferable license for the right to use the Software for the buyer s exclusive use and only in conjunction with Aeroqual Products Intended use The buyer will strictly adhere to the Intended Use of the Software and will not translate adapt reverse compile or other wise alter the Software The buyer undertakes not to disclose ass...

Страница 19: ...mined by turning the equipment off and on the user is encouraged to try to correct the interference by one or more of the following measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV techni...

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