Raymond OX-AN R-134a User manual

OX
-
AN
®
F
-
Gas
Environmental
Monitoring System Operation
Manual
Issue
1.7
Manu actured by: Raymond Coupland Ltd Priestley House St Luke’s
Road Kirkby Stephen Cumbria United Kingdom CA17 4HT Telephone
0800 7720894 www.ox-an.com email [e-mail]
Raymond Coupland Environmental
Unit W1
Technology Court
Whinbank Park
Newton Aycliffe
County Durham
DL5 6DA
United Kingdom
Tel: [phone] www.ox-an.com

Contents
1.0 INTRODUCTION ......................................................................................................................................... 1
2.0 SOFTWARE ................................................................................................................................................. 1
2.1 PC S OFTWARE .................................................................................................................................................. 1
2.2 PC XML C ONFIGURATION F ILES ........................................................................................................................... 1
2.3 S IGNAL B OARD PIC18F2550 F IRMWARE .............................................................................................................. 2
2.4 R ELAY B OARD PIC18F2550 F IRMWARE ............................................................................................................... 2
3.0 GETTING STARTED ...................................................................................................................................... 2
3.1 S ENSOR V ALUE T AB ........................................................................................................................................... 3
3.2 O UTPUTS T AB ................................................................................................................................................... 4
3.3 D IAGNOSTICS T AB ............................................................................................................................................. 5
4.0 USER OPERATION ....................................................................................................................................... 6
4.1 T OUCHSCREEN B UTTONS .................................................................................................................................... 6
4.2 A LARM L EVELS .................................................................................................................................................. 6
4.3 F AULT ............................................................................................................................................................. 7
4.4 I SOLATE ........................................................................................................................................................... 7
4.5 T EST ............................................................................................................................................................... 7
4.6 F AN C ONTROL .................................................................................................................................................. 8
4.6.1 Fans On ................................................................................................................................................. 8
4.6.2 Fans Off ................................................................................................................................................. 8
5.0 SYSTEM CONFIGURATION .......................................................................................................................... 8
5.1 C ONFIGURING I NPUTS (S ENSORS ) ......................................................................................................................... 9
5.1.1 Input (Sensor) Properties ..................................................................................................................... 10
5.2 C ONFIGURING O UTPUTS (R ELAYS ) ...................................................................................................................... 10
5.2.1 Output (Relay) Properties.................................................................................................................... 11
5.3 C ONFIGURING I NPUT -O UTPUTS .......................................................................................................................... 12
5.3.1 Output roup Editing .......................................................................................................................... 12
5.3.2 Sound Alarms Output roup ............................................................................................................... 12
5.3.3 Test Output roup .............................................................................................................................. 13
5.3.4 Fan Control Output roup ................................................................................................................... 13
5.4 S YSTEM S ETTINGS ............................................................................................................................................ 13
5.4.1 System Properties................................................................................................................................ 14
6.0 SENSOR LEVEL LOGGING .......................................................................................................................... 14
6.1 F AST L OG T IME ............................................................................................................................................... 15
6.2 S TART N EW L OG ............................................................................................................................................. 15
7.0 HARDWARE .............................................................................................................................................. 16
7.1 S ENSOR AND R ELAY C ARD A DDRESSING ............................................................................................................... 16
7.2 R ELAY B OARD F AIL S AFE F EATURE ...................................................................................................................... 17
8.0 CALI RATION ........................................................................................................................................... 18
8.1 N OTES FOR R-134 A B OARDS ............................................................................................................................. 18

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1.0 Introduction
The OX-AN R-134a Leak detection Monitor provides audible and visual warnings o the presence o
R-134a within a speci ied area. For hazardous areas, the Monitor also provides acilities or
monitoring reductions in Oxygen levels.
Features include:
• Up to 4 × USB based signal capture modules (total 32 sensors)
• Up to 4 × USB based relay modules (total 24 relays)
• .Net based so tware using Windows XP native USB drivers
• 1024×768 Touchscreen inter ace
• Individual sensor inputs so tware con igurable or R-134a or O
2
.
• 4 con igurable alarm levels
• 33 con igurable Output Groups
• Sound Alarms
• Relay speci ic Mute
• Sensor speci ic Isolate
• Sensor value logging
• Alarm logging
• Test Button which can be used to activate any alarm
2.0 Software
The OX-AN R-134a Monitor so tware comprises:
1. PC based application - R134AMonitor
2. PC XML con iguration iles
3. Signal Board PIC18F2550 Firmware
4. Relay Board PIC18F2550 Firmware
OX-AN Monitoring systems are typically con igured prior to delivery and commissioning. I a
so tware upgrade or re-install is required please contact OX-AN Gas Detection Ltd.
2.1 PC Software
OX_AN so tware is designed to run on Windows XP system (SP2) with .Net ramework v3.0. The .Net
ramework is not included within the OX-AN R-134a Leak detection Monitor and hence, i a ull
installation o the operating system is required, these components must be installed separately.
2.2 PC XML Configuration Files
The XML con iguration iles contain the con iguration data or the system settings. These iles are
located in c:\ R134AMonSettings. I these iles require replacement, they can be overwritten by the
new version. There are 4 iles:
1. OutputContainer.sxml

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2. RelayContainer.sxml
3. SensorContainer.sxml
4. SystemSettings.sxml
Note that “restoring system de aults” will overwrite these iles.
2.3 Signal Board PIC18F2 0 Firmware
The irmware located within the embedded boards can only be changed by replacing the PIC
processor with a pre-programmed PIC. Please contact OX-AN i the irmware requires replacement.
2.4 Relay Board PIC18F2 0 Firmware
The irmware located within the embedded boards can only be changed by replacing the PIC
processor with a pre-programmed PIC. Please contact OX-AN i the irmware requires replacement.
3.0 Getting Started
The ollowing procedure should be used when starting the system rom a complete power down.
1. Ensure that power is applied to the UPS
2. Isolate the outputs (using the keyswitch)
3. Ensure that power is applied to the Signal and Relay boards (using the keyswitch)
4. Start the PC (using the key switch)
5. System should automatically run the R134aMonitor program. I this does not occur, run the
application by selecting Start>R134aMonitor>R134aMonitor
6. Enable the outputs (using the keyswitch)
The R134aMonitor application will display the screen shown in Fig 2.0. Note that your system may
display di erent data. There are three screen tabs which can be viewed during normal running. Each
o these tabs is described in the ollowing sections.

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3.1 Sensor Value Tab
Fig 2.0 Sensor Values Tab
During normal running the Monitoring Screen (Fig 2.0) displays the location text, alarm levels, sensor
value and isolate status or both R-134a and O
2
sensors. This is the normal viewing screen.

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3.2 Outputs Tab
The Outputs tab, Fig 3.0, displays the current state o the relay outputs connected to the system.
During normal running the tab shows the location text and relay state or all relays.
Fig 3.0 Outputs Tab

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3.3 Diagnostics Tab
The Diagnostics tab provides a visual and textual indication o the connected Sensor and Relay
boards. It is important the number o connected boards is correctly speci ied in the system settings.
A ault condition occurs i any con igured boards are missing rom the system.
The Diagnostics tab is shown as Fig 4.0
Fig 4.0 Diagnostics Tab

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4.0 User Operation
During normal operation (i.e. not during con iguration) the OX-AN R-134a Leak detection Monitor is
designed or operation via a touchscreen inter ace.
4.1 Touchscreen Buttons
Three touchscreen buttons provide the main unctionality:
Sound Alarms Activates all relays allocated to the Sound Alarms Output roup
Mute Deactivates, for a specified time period, all relays which are activated but set as
muteable
Reset Resets all alarm levels, Test outputs and Fan control outputs
Test Activates all relays allocated to the Test Output roup
Fans On Activates all relays allocated to the Fan Control roup
Fans O Resets all relays allocated to the Fan Control roup – note relays may remain on if
allocated to other active output groups
4.2 Alarm Levels
Each alarm level changes the corresponding line in the sensor list.
Alarm Level 1 Line background LIGHT GREY
Alarm Level 2 Line background AMBER
Alarm Level 3 Line background FLASHING AMBER and AMBER ALARM WARNING visible
Alarm Level 4 Line background RED and RED ALARM WARNING visible
Fig 5.0 shows the system output or a RED alarm state.

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Fig 5.0 Display in Red Alarm
4.3 Fault
The system enters ault state i communications are lost with con igured Relay or Signal Boards.
Fault state is also entered i the user enters con iguration mode or show actual values.
4.4 Isolate
The Isolate warning message is shown i any active sensor is isolated. In isolated state the sensor
does not cause any output activity (i.e. no relays are activated).
For details o how to isolate a sensor see section 5.1.
4. Test
I the Test Output Group has been activated by pressing the Test button, the button is illuminated
and the system displays the Test Status warning message.
I the test warning message is displayed, the system continues to operate normally. To exit Test
mode press the Reset button.

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4.6 Fan Control
The Fan Control buttons activate and reset the Fan Control Output Group. Note that output relays
which are energised by the Fan Control Output Group being activated will not be muteable.
4.6.1 Fans On
The Fans On button activates the Fan Control Output Group. When pressed the button will be
illuminated and the system will show the Fans On warning message. The Fan Control Output Group
can be reset by either pressing the Fans Off button or by pressing the Reset button.
4.6.2 Fans Off
The Fans Off button resets the Fan Control Output Group.
.0 System Configuration
The system provides 4 con igurable alarm levels or each sensor input. Each o these alarm levels can
be programmed to activate an individual Output Group (up to 33) which, in turn, may contain up to
24 relays.
To program the system:
1. Set the number o Sensor boards and Relay Boards
2. Ensure that the Sensor and Relay boards are correctly addressed
3. Set the location text or the relay outputs
4. Allocate the required relays to the individual Output Groups
5. Select the type or each sensor
6. Set the location text or each sensor
7. Set the required alarm levels or each sensor
8. Set the alarm text or each sensor alarm level
9. Allocate the required Output Group to each sensor alarm level
Note that de aults are provided or all settings.
Selecting menu option Settings>Configuration moves the system into the con iguration mode and
displays the screen shown as Fig 6.0.
In this mode the system is still unctional but since the alarm levels cannot be viewed the user is
alerted to a change in the mode by entering the ault state. To exit the con iguration mode choose
the Cancel button to exit without saving, or press the Save button to save changes.
In both cases the system will show “initialising” or approximately 10 seconds be ore returning to
normal operation.
Note saving con iguration changes will cause the system to reset.

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The con iguration screen has 4 tabs:
1. Inputs – settings or Sensors
2. Outputs – settings or Relays
3. Input-Output – Output Group settings
4. System – general system settings
.1 Configuring Inputs (Sensors)
The Input tab is shown in Fig 6.0.
Fig 6.0 Con iguration Input Tab
To change a setting select the appropriate line in the sensor list and then modi y the parameters
using the property sheet on the right hand side o the tab.

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.1.1 Input (Sensor) Properties
The con igurable input parameters are:
For each sensor
1. Isolated Isolation state, when true sensor does not trigger alarm levels
2. Sensor Type R134a or O
2
3. Active Set true if sensor is present (if false sensor is ignored)
4. Location Text Text shown as sensor location in log
5. Samples Per Reading Number of samples used in calculating the sensor value
6. 4mA Value Offset for zero
7. 20mA Value Offset for full scale
8. Sensor Value Step Size Delta for changing the screen display
For each sensor Alarm Level
1. Alarm Level The level above (or below for O
2
) which the alarm is generated
2. Hysteresis The percentage which is added to the alarm level for state changes
in non-latching alarms
3. Latching Value Set true to make alarm latch
4. Output Group The Output roup for this sensor’s alarm level
5. Alarm Text The alarm text or this sensor’s alarm level
.2 Configuring Outputs (Relays)
The Output tab is shown in Fig 7.0.
Fig 7.0 Con iguration Outputs Tab

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To change a setting select the appropriate line in the relay list and then modi y the parameters using
the property sheet on the right hand side o the tab.
.2.1 Output (Relay) Properties
The con igurable output parameters are:
1. Location Text The text displayed in the Output tab of the monitoring screen
2. Mute If set true, the relay is switched off when system is muted

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.3 Configuring Input-Outputs
The Input-Output tab is shown in Fig 8.0.
Fig 8.0 Con iguration Input-Outputs Tab
The Input-Output tab is used to change the contents o the Output Groups. To change a setting
select the appropriate line in the Output Group list and then modi y the parameters using the
property sheet on the right hand side o the tab.
.3.1 Output Group Editing
Setting the Outputx value an output group means that the output (Relay) will be set to ON when the
Output Group is activated. As an example, in the setup shown in Fig 8.0, Relays 1, 2 and 3 will be set
to ON i Output Group 7 is activated.
.3.2 Sound Alarms Output Group
The Sound Alarms Output Group is activated when the Sound Alarms button is pressed. Within the
input/output listview (shown in Fig 8.0), the group is located immediately below output group 32.
Relay outputs allocated to this group will be energised when the group is activated.

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.3.3 Test Output Group
The Test Output Group is activated when the Test button is pressed. Within the input/output
listview (shown in Fig 8.0), the Test Output Group is located immediately below the Sound Alarms
Output Group.
Relay outputs allocated to this group will be energised when the group is activated.
.3.4 Fan Control Output Group
The Fan Control Output Group is activated by the Fans On button. Within the input/output listview
(shown in Fig 8.0), the Fan Control Output Group is located immediately below the Test Output
Group.
Relay outputs allocated to this group will be energised when the group is activated.
.4 System Settings
The System tab is shown in Fig 9.0.
Fig 9.0 Con iguration Systems Tab

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.4.1 System Properties
The con igurable system parameters are:
Data Logging
1. File Update Period The time between log samples( in seconds)
2. Alarm State File Update Period The time between log samples when the system is in an
alarm state ( in seconds)
3. File Change Period The number of days for each log file
System Settings
1. Mute Time The time in seconds to deactivate muteable relays
System Hardware
1. Number o Sensor Boards The number of Sensor Boards (these must be present)
2. Number o Relay Boards The number of Relay Boards (these must be present)
3. System Startup Delay Number of seconds to wait at system startup before
triggering alarms
6.0 Sensor Level Logging
The system continuously logs the value o all sensors to a CSV ile located in C:\R134AMonLog. The
disk iles are named as R134aMon_yyyymmddhhmmss.csv where yyyymmddhhmmss speci ies the
creation date.
Samples are written to the log ile at a predetermined time interval as well as whenever an alarm
occurs.
The ormat o the CSV ile is:
Date,Time,S1 Type,S1 Value,S2 Type,S2 Value,S3 Type,S3 Value ….. up to number o sensors
05/09/2007 23:36:47 R134a 27.99 R134a 31.1 R134a 24.88
I a sensor is isolated, “Isol” is written immediately be ore the sensor type.
I the sample is written in response to an alarm the sensor data is ollowed by the alarm data, or
example, i sensor 4 enters alarmlevel 2 state the CSV ile will contain 2 additional entries
immediately a ter the sensor value entries:
S4: Sensor 4 location text AlarmLevel2: Level2 Alarm Text

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6.1 Fast Log Time
I the system is in alarm state the logging time interval is determined by the Alarm State File Update
Period setting. In this condition the system displays the “Fast Log” message on the upper part o the
inter ace as shown in Fig 10.0
6.2 Start New Log
The menu option Logging>Start New Log closes the current log ile and begins writing samples to a
new log ile.

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7.0 Hardware
A block diagram o the hardware used in a 2 Signal Board/ 2 Relay Board OX-AN R-134a Leak
Detection Monitor is shown as Fig 11.0
4–20mA USB USB Isolator
Output
Fig 11.0 R-134a Hardware
The Uninterruptible Power Supply (UPS) powers all o the hardware components o the OX -AN
R-134a Leak Detection Monitor.
7.1 Sensor and Relay Card Addressing
Each Sensor Board and Relay Board has a small DIL switch which is used to set an address. This
address is used as part o the USB communications and hence the system will not unction correctly
unless the cards are correctly addressed.
Address 0:
Address 1:
Address 2:
Address 3:
Relay Board
Relay Board
PC running
R134aMonitor
Application
Signal Board
Signal Board
Uninterruptible
Power Supply
ON
ON
ON
ON

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[For Signal boards the USB PID is given by 0x40+Address]
[For Relay boards the USB PID is given by 0x30+Address]
Note: Boards must be addressed without gaps, i.e. only boards 0 and 2 are not allowed and the
addressing should be changed to 0 and 1.
7.2 Relay Board Fail Safe Feature
I a Relay board does not receive a speci ied USB based PC communication within a 10 minute period
the relay board will automatically activate all output relays. Please ensure that the outputs are
isolated i the R134aMonitor application is not running or any prolonged periods.

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8.0 Calibration
The menu option Settings>Show actual values displays the actual averaged values read rom the
AtoD. In the calculation or the ppm or % levels these values are multiplied by the relevant actor.
To calibrate the system (without sensors):
1. Set the 4-20mA box to 4mA using a meter. Note the values o the individual inputs.
2. Set the 4-20mA box to 20mA using a meter. Note the values o the individual inputs.
The zero o set is the 4mA value.
The ull scale value is the 20mA value.
Providing the sensor has a linear response, the system can be calibrated by setting the relevant 4mA
and 20mA values or each sensor input and then adjusting the actual sensor to provide 4mA to 20mA
across its range.
The equation used to generate the displayed value is:
8.1 Notes for R-134a Boards
For 2000ppm R-134a sensors 1800ppm = 18.4 mA
On R134a sensor adjust Z pot until led moves rom red to green.
Adjust 4mA pot until 4mA is read on the meter
Adjust the 20mA pot to give the correct mA or the test gas – 18.4mA or 1800ppm.
R134a Sensor Board
Z
4
2
0