Contents Description ............................. 3 1.1. S900 Components ........................3 1.2. Components not supplied but required ................... 3 Configuration ..........................3 2.1. Using the Aeroqual USB to RS485 converter ................. 3 2.2. Configuring the S900 using the PC software ................4 2.2.1.
1. Description The Aeroqual Series 900 Fixed Gas Monitors is designed to measure and control gas concentrations and to communicate to a variety of hardware systems. The monitor can operate as a relay controller with user controlled set points, a 4-20 mA gas transmitter as well as communicate via RS485 on a network.
2.2. Configuring the S900 using the PC software a. Plug in and install the USB to RS485 converter into your computer b. Wire the RS485 outputs into the instrument using table above c. Install the Aeroqual Fixed Monitor Configuration PC software d.
2.2.4. 4-20mA output scale The 4-20mA output scale sets the gas concentration scale. Each sensor head type has a default setting but the user can modify this by clicking the user define button and entering the required value that corresponds to 20mA. 2.2.5.
Note: When the output is floating there should be +0V measured between the output and +12V. When the output is activated +12V should be measured between the output and +12V. 3.2. Operation as a Relay Controller The S900 can be used as a simple relay controller using the alarm or control outputs which are open collector current sinks.
3.3.1. Procedure a. Connect the 4-20mA loop on the screw connector to the power supply and current measuring device (e.g. PLC) ensuring the polarity is correct. Please refer to the diagrams below. Note: If the polarity is incorrect the 4-20mA output may be permanently damaged b.
3.4.1. Connecting via RS485 a. Connect a 12vDC power supply to the power input on the PCB screw connector b. Use a twisted pair cable to connect the RS485 lines on the screw connector to the RS485 hub, bus or converter c.
5. Gas Measurement Guidelines The S900 should be installed at a location that is free from contaminants that might affect the performance of the sensor head. Please contact info@pce-iberica.es for assistance with specific chemicals that you believe may adversely affect the supplied sensor. In general the S900 should never be exposed to: - Steam, fumes, water or chemical spray - High condensing humidity...
Background gas level higher Move sensor to clean environment and than normal recheck baseline Move sensor to clean environment and Interference gas present Sensor showing high recheck baseline baseline reading under Sensor zero drift Rezero sensor in a clean, stable zero gas conditions environment Sensor damaged...
8. RS485 Protocol The S900 network system is based on industrial protocol RS485. This command protocol is specified by Aeroqual Limited. Copyright reserved 2004. The network communication is in master-slave mode, which means that a PC or other device will be the network master.
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* For S900 the field TEMP and RH will be always zero for Version 1.5 and later. * However, for S900 version 1.4 and earlier can't use this command to request temperature and humidity. 02. Standby command. The S900 unit will set its sensor head to standby state. The S900 will set STANDBY bit of STATUS2 to 1 indicating it is in standby mode.
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Reply: SENSOR, FACTOR_REQUEST, NETWORK_ID, DATA1, DATA2, RESERVED, STATUS1, STATUS2, CHECKSUM * DATA1 - 4 bytes, gas unit ppm to mg/m3 convert factor floating point value * DATA2 - 4 bytes, default S900 current output max scale factor floating point value 07.
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if it's 0x01, that is S900 no temperature and humidity sensor connected, if it's 0x03, that is S900 there is a temperature and humidity sensor connected. 10. Temperature and relative humidity data request command. The command asks for the temperature and humidity data that a specific S900 unit currently holds. The S900 unit responds with two values respectively.
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BASE_VERSION = 0xF9 command to request/report S900 base unit version number SENSOR_VERSION = 0xFB command to request/report sensor head version number FACTOR_REQUEST = 0x2A command to request/report sensor head concentration ppm to mg/m3 conversion factor and max current output scale factor BROADCAST = 0x00 broadcast command indicator, like a special S900 ID reserved for information broadcast PARAMETERS_UPLOAD...
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Alarm2_Triger b1 = 0, S900 alarm 2 triggered when reading exceed alarm 2 b1 = 1, S900 alarm 2 rigged when reading below alarm 2 Define_Ouput_Scale b2 = 0, use sensor head default current output value b2 = 1, user defined current output value RESERVED reserved RESERVED...
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. ...
(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, assign, sell, rent, lend, sub license or otherwise transfer the Software. 10.3.
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