PCE Instruments Aeroqual 900 Series User manual

Aeroqual Series 900 User Guide Page | 1
Spain
PCE Ibérica S.L.
CIF B02363497
Calle Mayor, 53
02500 Tobarra
Albacete
Spain
Tel.: [phone]
Fax: [phone]
[email protected]
www.pce-instruments.com/espanol
Chile
PCE Instruments Chile SA
RUT 76.154.057-2
Calle Santos Dumont N° 738, Local 4
Comuna de Recoleta
Santiago de Chile
Chile
Tel. : [phone]
Fax: [phone]
[email protected]
www.pce-instruments.com/chile
PCE Instruments

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Aeroqual Series 900 User Guide
Contents
1. Description.....................................................................................................................................3
1.1. S930 Components ..................................................................................................................3
1.2. Components not supplied but required...................................................................................3
2. Configuration.................................................................................................................................3
2.1. Using the Aeroqual USB to RS485 converter.........................................................................3
2.2. Configuring the S930 using the PC software..........................................................................4
2.2.1. Changing the Port ID.......................................................................................................4
2.2.2. Alarms .............................................................................................................................4
2.2.3. Control.............................................................................................................................4
2.2.4. 4-20mA output scale .......................................................................................................5
2.2.5. Upload.............................................................................................................................5
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 Maintenance................................................................................................................17
9.1. Disposal / Recycling..............................................................................................................17
10. Appendix......................................................................................................................................18
10.1. Copyright...........................................................................................................................18
10.2. Software License...............................................................................................................18
10.3. Terms and Conditions.......................................................................................................18
10.4. Statements of Compliance................................................................................................18

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Aeroqual Series 900 User Guide
1. Description
The Aeroqual Series 930 Fixed Gas Monitor 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. They can also connect to PC data
logging and networking software to allow for real-time network capability to be set up and logged data
to be stored. The software can be found at our website www.aeroqual.com.
1.1. S930 Components
The following components are supplied with the S930 Fixed Gas Monitor:
Series 930 base unit
Temperature and Relative Humidity Sensor (Optional)
Integrated display (Optional)
Strobe & Siren (Optional)
RS485 to USB converter for PC configuration (Optional)
Please check that all these components have been supplied and contact your distributor.
Replacement sensor heads and other accessories can be purchased separately.
Note: All sensor heads deteriorate over time. 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 Monitor
Configuration software. The PC software can be found on our website at www.aeroqual.com.
To configure the instruments by computer you will need an RS232/RS485 or USB/RS485 converter.
There are many RS232/RS485 converters available on the market however only certain brands will
function well with the Aeroqual products. Aeroqual can supply a USB/RS485 converter suitable for
configuring the instruments. Please contact your account manager for more information.
2.1. Using the Aeroqual USB to RS485 converter
The USB-RS485 converter cable provides a USB to RS485 serial interface with customised end
connectors. The drivers required can be downloaded for free from www.ftdichip.com.
Note: Aeroqual S930 monitors communicate via 2 wire RS485 so the
converter must be configured to RS485 2W.
USB to RS485 wiring
S930 Output
GND (Black)
GND
Data+ (A) (Orange)
RS485A
Data- (B) (Yellow)
RS485B

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Aeroqual Series 900 User Guide
2.2. Configuring the S930 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. Power up the instrument
e. Run the Fixed Monitor Configuration software
f. Select Unit by entering the Port ID of the instrument you
wish to modify and click on "Download” to download the
unit’s current values
Note: All new products have a default ID of 1
g. Modify settings
h. Click Upload to upload the settings to the instrument
i. Click Exit
2.2.1. Changing the Port ID
Click on “Port” menu and select “Change Port ID” to change ID
to your requirement in the range 1 to 255.
Note: If you are setting up a network 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 below the set point. The Alarms can be enabled or disabled by clicking “Enable” or “Disable” on the
main menu.
2.2.3. Control
The control output is triggered according to the band set by the control high and control low values.
Note: Control high must be greater than control low
The action of this output is designed to enable control of an external device such as an ozone
generator. The control output will be "on" when the concentration is rising in the range from below
control low until it hits control high when it turns off. It remains off until the concentration falls below
control low.

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Aeroqual Series 900 User Guide
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. Upload
Clicking this button uploads the settings to the instrument.
2.2.6. Download
Clicking this button downloads the settings from the instrument. Use this function to check the settings
are correct.
3. Operation
3.1. Description of Outputs
DIAG
This output is designed to enable detection of sensor faults. This is normally floating but is set to GND
when the sensor fails. Thus it can be considered a "switch" which is closed when the sensor fails. This
can be used to activate an alarm or relay and can also be monitored with a PLC. The output is an
open collector current sink. The maximum rating of the transistor output is 24VDC at 150mA.
LoALM
This is set to GND when low alarm is activated. It is floating at other times. Use the Configuration
Program to set the Low alarm set point. The output can be used to drive an alarm relay or similar. The
alarm can be set to trigger above or below the set point using the configuration software. The output
is an open collector current sink. The maximum rating of the transistor output is 24VDC at 150mA. If a
relay coil is connected or any other inductive load to 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 relay coil is connected or any other inductive load to the transistor outputs, a back EMF
suppression diode must be fitted across the load.
CNTRL
This is set to GND when the gas concentration is rising in the range from below the Control low set
point to the Control high set point at which stage, it is set to floating. It remains floating until the
concentration falls below the Control low set point at which point, it is reset to ground. Use the
Configuration Program to set the Control set points. This output can be used to control, for example, a
gas generator or vent in a process operation. The output is an open collector current sink. The
maximum rating of the transistor output is 24VDC at 150mA. If a relay coil is connected or any other
inductive load to the transistor outputs, a back EMF suppression diode must be fitted across the load.
STBY
STBY is a hardware toggle switch. If it is briefly pulsed (about 50ms) to GND it puts the sensor head
into Standby mode and the S930 into Sleep mode. If pulsed again to GND it will return to normal
operation. This can be used to protect the sensor during process room cleaning and/or to reduce
power and extend sensor life when the sensor is not needed.

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Aeroqual Series 900 User Guide
3.2. Operation as a Relay Controller
The S930 has a set of integrated relay contacts which can be used to operate the instrument as a
simple relay controller. The relays need to be wired into the instrument using the relevant alarm or
control outputs, which are open collector current sinks. The alarm and control outputs are set to
ground when activated according to their set points. The set points can be configured by computer
using the Configuration PC software. It is recommended that the DIAG output is always used to alert
a sensor fault condition.
3.2.1. Procedure
a. Connect 24VDC power supply
b. Connect alert relay/alarm to DIAG output screw connector if required
c. Connect relay ground toggle to STDBY pin on the screw connector if required.
d. Connect control relay to CNTL output on the screw connector if required.
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 scale
(20mA) value is factory set but can also be user configured with the Configuration PC software. If the
sensor fails the output will be 20mA. It is also recommended that the DIAG output is used to monitor
for fault conditions.
The 4-20mA output loop is opto-isolated from the Series 930 unit and it is recommended that it be
powered by a separate power supply with a voltage in the range 12-24V applied with the correct
polarity. This will produce the most reliable connection method. If opto-isolation is not important then
the 4-20 mA loop may be powered by the same power supply as the unit.
100-240VAC
L
N
E
Power Supply
(24VDC)
Internal Relay
External
Device

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Aeroqual Series 900 User Guide
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. 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 Supply
GND +
GND +
- +
Power Supply
24VDC
4-20mA
+
-
PLC or Current Meter

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Aeroqual Series 900 User Guide
4-20 mA wiring diagram for Loop with integrated display
Note: The integrated display is a single ended device and therefore always needs to be located
at the end of the loop.
3.4. Operation as a RS485 Transmitter
The Series 930 unit can communicate over a RS485 bus. Each monitor has an ID which can be user
defined via the Configuration PC software. Up to 255 units can be networked together using the
Network PC software.
Note: Both the Configuration and Network PC software can be found on our website
www.aeroqual.com
3.4.1. Connecting via RS485
a. Connect a 24vDC 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. 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 correctly to ensure the network
communication is stable. The jumpers JP1, JP2, JP3 are to install
termination resistors on the RS485 communication lines. Remove the
jumpers J1, J2, J3 for all S930 units in a chain except the last S930 unit in
the network chain. If there is only one unit then set the jumpers in place. To
access these jumpers remove the sensor head and unscrew the S930 base
plate.
- +
- +
GND +
Power Supply
24VDC
4-20mA
+
-
Integrated Display External Device

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Aeroqual Series 900 User Guide
ID Settings
Monitors on the network require unique IDs so they can be distinguished on the RS485 network. The
factory default ID of the units is ID 1. Therefore they will need to be changed to unique IDs. Use the
Configuration PC software to change the IDs.
4. S930 Specifications
5. Gas Measurement Guidelines
The S930 should be installed at a location that is free from contaminants that might affect the
performance of the sensor head. Please contact [e-mail] for assistance with specific
chemicals that you believe may adversely affect the supplied sensor. In general the S930 should
never be exposed to:
- Steam, fumes, water or chemical spray
-Aggressive solvents
-High condensing humidity
-Cooking vapours/aromas
-Paint fumes
- High levels of dust
Ensure that the controller is protected from excessive water splashing, dust, vibration, excessive 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 protocol)
Jumpers
J1, J2, J3 termination resistors
Connectors
Screw
ID
1 (Default) User configurable from 1 to 255
Alarm set points (2)
User configurable
Control set point
User configurable
Removable/replaceable sensor head
Yes
Sampling method
Active sampling via internal sensor fan
Temperature & humidity sensor
(Optional)
Range -40°C to 124°C (-40°F to 255°F) | Range 0 to 100% RH
Configuration software
PC Configuration Software
Data logging & networking software
PC Data Logging & Networking Software
Enclosure casing
Fibre reinforced polycarbonate | IP41 & NEMA 2 equivalent
Enclosure size
180 x 110 x 90 (mm); 7⅛ x 4¾ x 3½ (in)
Weight
< 850 g; < 30 oz
Approvals
Part 15 of FCC Rules EN 50082-1: 1997 EN 50081-1: 1992

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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