AFA4000/1
Airflow monitor
Installation and operating manual
Issue 1
AFA4000/1 Airflow Monitor / p.2
Contents
1. Introduction.......................................................................................................................................................... 5
1.1 Features ...................................................................................................................................................... 6
2. Safety ...................................................................................................................................................................... 7
2.1 Safety practices ........................................................................................................................................ 7
2.2 Precautions ................................................................................................................................................ 7
2.3 Warnings .................................................................................................................................................... 7
2.4 Operating conditions ............................................................................................................................. 8
2.5 Electrical safety ........................................................................................................................................ 9
2.6 Electrical protection .............................................................................................................................. 10
2.7 EMC compliance .................................................................................................................................... 11
3. Overview: Airflow Monitor ............................................................................................................................. 12
3.1 Display ...................................................................................................................................................... 12
3.2 Alarms and events................................................................................................................................. 14
3.3 Controls and indicators ....................................................................................................................... 16
3.4 Operator display panel menu navigation ...................................................................................... 17
3.5 External connections ............................................................................................................................ 19
3.6 Functions ................................................................................................................................................. 21
3.7 Components ........................................................................................................................................... 26
4. Overview: Auto Sash Controller ................................................................................................................... 28
4.1 Features .................................................................................................................................................... 28
4.2 Auto Sash control options .................................................................................................................. 29
4.3 Control system components .............................................................................................................. 32
5. Installation: Airflow Monitor .......................................................................................................................... 40
5.1 Location .................................................................................................................................................... 40
5.2 Installation ............................................................................................................................................... 42
5.3 Connections ............................................................................................................................................ 45
5.4 Dimensions.............................................................................................................................................. 49
AFA4000/1 Airflow Monitor / p.3
5.5 Start up ..................................................................................................................................................... 51
6. Installation: Auto Sash Controller ................................................................................................................ 53
6.1 Auto Sash Control Unit ........................................................................................................................ 53
6.2 Auto Sash keypad / alarm panel....................................................................................................... 56
6.3 Auto Sash motor drive unit ................................................................................................................ 57
6.4 Sash light curtain ................................................................................................................................... 65
6.5 Installing and aligning the Under Sash sensor ............................................................................. 72
6.6 Tilt switch ................................................................................................................................................. 74
6.7 Sash Low switch ..................................................................................................................................... 75
6.8 Sash position sensor ............................................................................................................................ 77
6.9 Personnel sensor ................................................................................................................................... 79
6.10 Auto Sash System Control Box - general wiring diagram ........................................................ 87
6.11 Start up ..................................................................................................................................................... 88
7. Calibration .......................................................................................................................................................... 89
7.1 AFA4000/1 Airflow Monitor ............................................................................................................... 89
7.2 Auto Sash Controller 1, 2 or 3 position. ......................................................................................... 91
7.3 Sash lock function ................................................................................................................................. 93
7.4 Auto Sash Controller – stand-alone ................................................................................................ 94
8. Configuration ...................................................................................................................................................103
8.1 AFA4000/1 configuration menus ...................................................................................................103
8.2 AFA4000/1/AS configuration menus ............................................................................................111
8.3 Auto Sash Controller system menus .............................................................................................123
9. Auxiliary features and connections ...........................................................................................................131
9.1 Optional input function - temperature sensor ...........................................................................131
9.2 Optional input function – close sash alarm.................................................................................133
10. RS485 communications output ..................................................................................................................136
10.1 Overview and connections ...............................................................................................................136
10.2 Configuration settings .......................................................................................................................138
10.3 Config Manager ...................................................................................................................................140
AFA4000/1 Airflow Monitor / p.4
11. Operation: Airflow Monitor .........................................................................................................................142
11.1 Run screen .............................................................................................................................................142
12. Operation: Auto Sash Controller ................................................................................................................143
12.1 Control philosophy .............................................................................................................................143
12.2 Modes of operation ............................................................................................................................143
12.3 Operation and alarm indication ......................................................................................................147
13. Troubleshooting..............................................................................................................................................149
13.1 Fault finding ..........................................................................................................................................149
13.2 Diagnostics menu................................................................................................................................153
13.3 Auto sash alarm indications .............................................................................................................155
14. Cleaning and maintenance ..........................................................................................................................158
14.1 Cleaning .................................................................................................................................................158
14.2 Contamination .....................................................................................................................................159
14.3 Maintenance .........................................................................................................................................159
15. Technical specifications ................................................................................................................................160
15.1 AFA4000/1 Airflow Monitor .............................................................................................................160
15.2 Auto Sash Controller ..........................................................................................................................162
16. Warranty ............................................................................................................................................................169
17. Index ...................................................................................................................................................................171
AFA4000/1 Airflow Monitor / p.5
1. Introduction
The TEL AFA4000 is a system for controlling and monitoring airflow in industrial and
educational fume cupboards and biological safety cabinets for user safety. The AFA4000
airflow monitor and controller is available with optional Auto Sash integration. Using the
Auto Sash with the AFA4000 controller means you will no longer need a separate Auto
Sash keypad.
The AFA4000 user interface is full colour, intuitive and is easy to navigate. It features a
simple two-step calibration process with on-screen prompts to guide end users. The
unrivalled reliability of the AFA4000 means that once calibrated, you will not need to recalibrate in the future. The AFA4000 has in-built communications as standard and it can
be used with either Modbus or BACnet protocol.
Featuring an innovative hot wire sensor, the AFA4000 has no inherent drift meaning that
the sensor will provide stable readings over many years of operation ensuring reliability
and safety.
The AFA4000 has full alarm diagnostics and test functionality, a sixty-minute timeline of
environmental conditions and field-upgradable software, with password protected
menus and diagnostic menus to aid installation and commissioning.
This manual covers the AFA4000/1 and AFA4000/1/AS airflow monitors.
AFA4000/1 Airflow Monitor / p.6
1.1 Features
• Full colour 3.5” LCD Display for continuous velocity reading in m/sec
• Auto Sash integration
• BACnet and Modbus on board
• Velocity bar graph or fault time line over the last 60 minutes
• Visual & audible alarms
• Three digital inputs and three digital outputs
• Diagnostics Menu
• Bespoke overlay designs, with a choice of two, coloured cases
• Bespoke software options tailored to customer requirements
• Touch sensitive buttons
AFA4000/1 Airflow Monitor / p.7
2. Safety
2.1 Safety practices
This guide is a supplement to the safety codes of the user’s country. Not every safety
procedure that should be followed is covered by this guide. Maintaining a safe
laboratory environment is the responsibility of the user.
Review product documentation prior to use and follow instructions carefully.
If the Airflow Monitor or Auto Sash Controller are not used or operated in accordance
with this manual, the protection provided by the devices may be impaired.
2.2 Precautions
• Ensure the equipment voltage corresponds to the voltage available at the installation
position.
• Do not remove equipment panels without shutting down the equipment and
disconnecting the power supply.
2.3 Warnings
2.3.1 Warning notices
WARNINGS must be followed in order to avoid personal injury.
2.3.2 Warning labels
WARNINGS appear as follows:
Switch off the mains voltage and remove the mains cord before
maintenance.
Always follow the instructions given by warning labels on the equipment. For further
information refer to this guide and other documentation provided.
AFA4000/1 Airflow Monitor / p.8
2.4 Operating conditions
2.4.1 General operation
The Airflow Monitor and associated equipment have been designed and tested in
accordance with the International Electrotechnical Commissions (IEC) safety
requirements. The Airflow Monitor conforms to IEC61010-1 (Safety Requirements for
electrical equipment for measurement, control and laboratory use) as it applies to IEC
Class 1 (earthed) appliances, and therefore meets the requirements of EC directive
2014/30/EU.
Adjustment, maintenance or repair of the equipment whilst covers are open or the
equipment is in operation is only to be done by skilled persons who are aware of the
potential hazards.
Make unsafe equipment inoperative.
Examples of unsafe equipment:
• Appears damaged
• Fails to perform correctly
• Has undergone transport stresses
• Has been stored incorrectly
2.4.2 Environmental conditions
Ensure the equipment is used under the following conditions:
• Indoors
• Temperature, 5°C to 40°C
• Relative humidity below 80% for temperatures up to 31°C, decreasing linearly to 50%
at 40°C
• Electrical supply fluctuations not to exceed +10% of nominal voltage
The protection provided by the equipment may be impaired if the
environmental conditions do not lie within these parameters.
AFA4000/1 Airflow Monitor / p.9
2.5 Electrical safety
Lethal voltages are present at certain points within the equipment.
When the equipment is connected to mains power, removing the
equipment's covers is likely to expose live parts.
Even when the power switch is off, high voltage can still be present.
Capacitors within the equipment may still be charged even if the equipment
has been disconnected from all live voltage sources.
Connect the Airflow Monitor and associated equipment correctly to a suitable electrical
supply. The supply must have a correctly installed protective conductor (earth or
ground), which must be installed and checked by a qualified electrician before initial
power up.
Any interruption of the protective conductor inside or outside the Auto-Sash
Controller System, or disconnection of the protective conductor terminal is
likely to make the equipment dangerous.
Never interrupt the protective conductor.
If the mains power cord needs to be replaced, ensure that the replacement
cord is appropriately rated and approved for the intended use.
To prevent potential personal injury and damage to the equipment, switch
OFF all components in the system and disconnect them from the mains
power supply before altering or making any new electrical connections.
When working with the Airflow Monitor System and/or the Auto Sash Controller System:
• Do not operate equipment with any covers or internal parts removed.
• Disconnect the equipment from live voltage sources before adjustments,
replacements, maintenance or repairs are carried out. If the equipment must be
operated during adjustment, maintenance or repair, only a supplier’s Service Engineer
is to carry out the procedure.
AFA4000/1 Airflow Monitor / p.10
• Ensure equipment that is not electrically safe is made inoperative. Secure the
equipment against unauthorised or unintentional operation. Examples of electrically
unsafe equipment conditions are as follows:
• Appears damaged
• Has undergone transport stresses
• Has been stored incorrectly
2.6 Electrical protection
Observe the following electrical protection precautions:
Insulation:
Class I rating for external circuits.
Only connect equipment that meets the requirements of IEC
61010-1, IEC 60950 or equivalent standards.
Installation category:
The equipment can withstand transient over-voltages
typically present on the mains supply. The normal level of
transient over-voltages is impulse withstand (overvoltage)
Category II of IEC 60364-4-443.
Pollution degree 2:
Normally only non-conductive pollution occurs. Occasionally,
however, temporary conductivity caused by condensation
must be expected.
External circuits:
External circuits which are connected to the Auto Sash
controller, except mains connection, shall be insulated by
double or reinforced insulation from the mains.
AFA4000/1 Airflow Monitor / p.11
2.7 EMC compliance
2.7.1 EC Directive
The Airflow Monitor and Auto Sash Controller Systems are designed and tested to meet
the requirements of the EC directive 2014/30/EU and complies with the EMC standard
EN61326 (EMC standard for electrical equipment for measurement, control and
laboratory use) and EN55011 (ISM) Class A (RF emissions).
2.7.2 FCC Rules and Regulations
The Airflow Monitor System and Auto Sash Controller Systems are classified as digital
devices used exclusively as industrial, commercial or medical test equipment. They are
exempt from the technical standards specified in Part 15 of the FCC Rules and
Regulations based on Section 15.103 (c).
AFA4000/1 Airflow Monitor / p.12
3. Overview: Airflow Monitor
3.1 Display
3.1.1 Operator display panel
A
Airflow bargraph or timeline display
B
Airflow velocity display with LED halo
(red/amber/green)
C
Status window, airflow alarm status
Auto Sash status (AFA4000/1/AS only)
D
Menu pushbuttons and alarm mute
Auto Sash Up/Down/Cancel buttons
(AFA4000/1/AS only)
Figure 1: Operator display panel
Note: Access to the Calibration and Configuration menus is password protected and is
factory set.
To access and or change the password contact the supplier for the engineer’s
password and enter the passwords in the Main Menu, or alternatively use a
laptop connected to the Com port and use the Upload/Download software
provided.
A B C
D
AFA4000/1 Airflow Monitor / p.13
3.1.2 Display features
The airflow monitor displays the following features:
• The digital display is a backlit, full colour high resolution graphic unit with a visual
display area of approximately 45 x 34 mm. The display operates through the software
allowing the generation of figures, words and icons. You can choose either blue or
black for the background colour of the display.
• Using the alarm keypad, you can configure the display to show the fume cupboard
velocity in m/sec or fpm. Alternatively, you can configure the display to show AIR
FAIL / AIR SAFE continuously.
The colour of the velocity on the display screen changes when in an alarm condition, to
the following:
• Air Safe = White
• Low/ High Air Alarm = Red
• Warning Air Alarm = Amber
An ‘event time line’ segmented into 60 x 1 minute segments scroll across the display
(when enabled). The event time line is displayed as a graphical scale ranging over 0-1.00
m/sec that progresses across the screen, representing the airflow value at each segment.
The segment colour changes, as above, if the value is in the range of an airflow alarm.
• The alternative to the event time line is a dynamic ‘bar graph’ representing the
airflow velocity.
The display shows an up and down arrow icon, , in the bottom right hand corner of
the screen when an input function is set to Hi / Lo (2 speed operation). The up arrow
indicates High speed and the down arrow indicates Low speed.
• The display shows a Horn icon (with a line across it) when the audible alarm is muted.
• The display backlight dims to save energy when the following functions are in use:
• Fan Off activated- display backlight dims until Fan On is selected.
Backlight brightens to normal level when you access the Set Up or Diagnostics
menus.
AFA4000/1 Airflow Monitor / p.14
• Setback activated- display backlight dims until the Setback is deactivated.
Backlight brightens to normal level when you access the Set Up or Diagnostics
menus.
3.2 Alarms and events
Message
Displayed when
Sash high
The Sash alarm is activated, and the sash is raised above the
maximum safe working opening. Sash high alternates on/off with
the velocity reading.
External alarm
The external alarm input is activated. External alarm alternates
on/off with the velocity reading.
Alarm fail
The airflow is less than the low air alarm point. Air fail alternates
on/off with the velocity reading.
High alarm
The airflow is more than the high air alarm point. High Air
alternates on/off with the velocity reading.
Setback
The night setback function is activated. Setback alternates on/off
with the velocity reading. The display backlight dims.
Alarm disabled
The alarm disable function is activated. Alarm disable alternates
on/off with the velocity reading.
Close sash
The sash is raised and the operator is not present (when activated).
Close sash alternates on/off with the velocity reading.
Emergency
The emergency input is activated. Emergency alternates on/off with
the velocity reading.
Up / down arrow
The Hi/Lo 2 Speed operation is enabled.
Message
Displayed when
Mains fail
The power fails to connect to the monitor, when activated.
Note: This is an optional extra feature that requires an additional
battery unit.
AFA4000/1 Airflow Monitor / p.15
Message
Displayed when
Low temperature
The cupboard temperature drops below the low temperature alarm
point, when activated. The display alternates on/off with the
velocity reading.
Note: This is an optional extra feature that requires an additional
temperature sensor.
High temperature
The fume cupboard temperature rises above the high temperature
alarm point, when activated.
Note: This is an optional extra feature that requires an additional
temperature sensor.
AFA4000/1 Airflow Monitor / p.16
3.3 Controls and indicators
3.3.1 LED indicators
The alarm unit has three LED indicators:
Red- Alarm
Amber- Caution
Green- Safe
3.3.2 Audible alarm sounder
The AFA4000/1 has an audible sounder with local or remote mute facilities. You can
permanently disable the alarm in the calibration and configuration menus.
You can mute the alarm by activating the Setback or Alarm Disable functions.
When the audible alarm is muted/ disabled, the mute icon displays at the bottom left
side of the screen.
When an input is set to the mute function the keypad Mute button is disabled and you
can only mute the alarm by using the selected mute input.
3.3.3 Pushbuttons
Mute
The alarm has a multifunctional Mute button, .
Press Mute once, when the alarm is sounding to mute the alarm.
Press Mute for 5 seconds to access the calibration and configuration
menus.
↑ / ↓
Use the ↑ and ↓ buttons to scroll through the calibration and configuration
menus or to select options and values.
AFA4000/1 Airflow Monitor / p.17
3.4 Operator display panel menu navigation
To scroll through menu items, press the ↑ and ↓ arrows, then press Mute to select an
option.
3.4.1 Main menu
To display the Main Menu, from the Run Screen, press and hold the Mute button for 5
seconds until the Main Menu is displayed.
Menu item
Option
Instructions
Run
Run screen
See Operation section
Set up Monitor
Monitor setup menu
See Monitor setup menu
section
Set up Auto Sash
Note: This option is only
available if the Auto Sash is
connected.
Auto Sash Configuration
menu
See Auto Sash
Configuration menu
section
3.4.2 Monitor setup menu
Menu item
Option
Instructions
Configure *
Monitor config menu
See section 8.
Calibration *
Calibration
See section 7.
Passwords *
Monitor passwords menu
Select the password to set:
• Admin
• Calibration
• Configure
Enter and re-enter the
new password, then press
the Mute button.
Select Done to return to
the Main menu.
AFA4000/1 Airflow Monitor / p.18
Menu item
Option
Instructions
Done
Return to Main menu
Note: Menu items marked * are password protected. To enter the password, use ↑ / ↓
to change each digit of the password, then press Mute.
3.4.3 Auto Sash Configuration menu
Note: This option is only available if the Auto Sash is connected.
Menu item
Option
Instructions
TEL Sash Closer
Shows the firmware (F/W)
and Hardware (H/W) versions
Read-only information
Setup Menu *
Auto Sash setup menu
See section 8.2.1.
Engineering Menu *
Auto Sash engineering
menu
See section 8.2.2.
Exit
Return to Main menu
Note: Menu items marked * are password protected. To enter the password, use ↑ / ↓
to change each digit of the password, then press Mute.
AFA4000/1 Airflow Monitor / p.19
3.5 External connections
3.5.1 Inputs
The AFA4000/1 has the following inputs:
3.5.1.1 Input 1, Input2, Input 3
These are volt-free inputs configurable for:
• Normally closed relays
• Normally open relays or
• Analogue 0 - 5 Vdc input
The inputs can be configured as:
Digital input functions (closed or
open volt free contact):
Alarm disabled
Night set-back
External alarm
Emergency
Sash high
High / Low
Sash warning
Mains fail
Fan stop
Mute
Fire Alarm
Analogue input functions:
Temperature
3.5.2 Outputs
The AFA4000/1 has the following outputs:
3.5.2.1 Relay outputs 1, 2, 3
These are volt-free inputs configurable for:
• Normally closed relays or
• Normally open relays
3.5.2.2 Analogue output 1
0 - 10 Vdc re-transmission of face velocity over 0 - 1.00 m/sec, for example 0.50 m/sec =
5 Vdc.
AFA4000/1 Airflow Monitor / p.20
3.5.3 Communications
3.5.3.1 Com port
This enables connection to a laptop or PC for configuration and for communications to
building management or automation systems (BMS/BAS).
For specific information on Modbus RTU options and settings, see section 8.1.1.3.
For specific information on BACnet options and settings, see section 8.1.1.4.
3.5.4 Power supply
Low voltage DC power supply from the mains power adaptor.
3.5.5 Optional inputs
3.5.5.1 Temperature sensor
Bespoke temperature sensor for connecting into inputs 1, 2 or 3 to give temperature
display with high or low temperature alarms.
3.5.5.2 PIR occupancy sensor
Auxiliary PIR used for close sash alarm based on the fume cupboard occupancy.
3.5.5.3 Mains fail battery unit
Auxiliary plug-in battery unit has a mains fail alarm.
AFA4000/1 Airflow Monitor / p.21
3.6 Functions
3.6.1 Airflow functions
The AFA4000/1 airflow display can be set up using the pushbutton menus to display
airflow in units of m/sec or fpm and can also be set to show plain text Air Safe & Air Fail
only.
The AFA4000/1 has 4 programmable airflow alarms:
Safe airflow
• Airflow reading above warning level (for example, > 0.45
m/sec).
• Green Safe LED on.
Warning airflow
• Airflow reads between warning level and air fail level (for
example, > 0.4 m/sec and < 0.45 m/sec).
• Amber Warning LED on.
Low airflow
• Airflow reads below alarm level for longer than the
warning to low air delay time.
• Air Fail toggles on / off with display.
• Red Alarm LED on (Flashing).
• Audible alarm sounds - can be muted by pressing the
Mute pushbutton.
• Low air relay operates (if configured).
• Reset: when airflow rises 0.02 m/sec above Low air level
for longer than the low air to warning air delay time, the
Low air alarm resets automatically.
High airflow
If configured:
• Airflow reading above high level (for example > 1.50
m/sec)
• High Air toggles on / off with display.
• Red Alarm LED on (Solid).
• High air relay operates (when configured).
AFA4000/1 Airflow Monitor / p.22
3.6.2 Audible alarm mute
When the audible alarm is muted via the Mute button, an icon ( ) displays.
The audible alarm can be permanently disabled by selecting Not Enabled in the Cal
Config menu (Setup Monitor > Configure > Cal Config Menu > Audible Alarm).
3.6.3 Input functions
The AFA4000/1 has 3 programmable inputs that can be set to:
• Analogue (0 - 5 Vdc)
• Digital open or
• Digital closed operation
3.6.3.1 Analogue input functions
Function
Description
Temperature
• Any Input set to Analogue - Temperature
• Temperature is displayed alongside airflow velocity in °C or °F
• Low Temp toggles on / off with display if temperature is less
than the Low Temp Alarm point
• Red Alarm LED on (Flashing)
• Audible alarm sounds - can be muted by pressing the Mute
pushbutton
• Low Temp relay operates (when configured)
• High Temp toggles on / off with display if temperature is
higher than the High Temp Alarm point
• Red Alarm LED on (Flashing)
• Audible alarm sounds - can be muted by pressing the Mute
pushbutton
• High Temp relay operates (if configured)
AFA4000/1 Airflow Monitor / p.23
3.6.3.2 Digital input functions
Function
Description
Alarm disable
When input configured as Alarm is disabled:
• Alarm disabled is displayed.
• Red LED on (Flashing).
• Audible alarm muted.
• Mute Icon shown on display.
Night set-back
When input configured as Night Set-back is activated:
• Night Set-back Icon displayed.
• Audible alarm muted.
• Mute Icon shown on display.
• Low Air alarm muted if set to Maintain Low Air.
• Reduce Low Air & Warning alarms active if set to Reduce Low
Air.
External alarm
When input configured as External alarm is activated:
• Red LED on (Flashing) – (when configured).
• External Alarm toggles on / off with display - (when
configured).
• Audible alarm sounds. Can be muted by pressing the Mute
pushbutton.
• External Alarm relay operates (when configured).
Sash High
When input configured as Sash High is activated:
• Amber LED on Solid (Flashing when alarm muted)
• Sash High toggles on / off with display if sash height >
calibrated position
• Audible alarm sounds. Can be muted by pressing the Mute
pushbutton
• Sash High relay operates (when configured)
• Alarm re-activates after time delay when repeat time enabled
High / Low
When input configured as High/Low is activated:
• Display Icon shows ↑ (High) or ↓ (Low)
AFA4000/1 Airflow Monitor / p.24
Function
Description
• High / Low relay operates (when configured)
• This function is designed for two speed fan operation or two
position damper operation switched using a micro switch or
proximity switch activated at a given position on the sash.
Sash Warning
When the input configured as Sash Warning is activated:
• Red LED on.
• Sash Warning - toggles on/off with velocity display.
• Audible alarm sounds (after pre-set time).
• Audible can be muted by pressing the Mute pushbutton. This
silences the alarm (when configured).
• Alarm re-activates after time delay when repeat time enabled
• Reset when the sash is lowered to closed position and the
input is de-activated or an operator is present.
Mains Fail
(Optional extra
feature)
When the input configured as Mains Fail is activated:
• Red LED on
• Mains Fail is displayed
• Audible alarm sounds
• Audible can be muted by pressing the Mute pushbutton. This
silences the alarm (if configured)
Fan Stop
When the input configured as Fan Stop is activated:
• Off is displayed.
• Red LED on (Solid).
• Audible alarm muted.
• When the input configured as Fan Stop is de-activated.
• Start Up Timer is displayed.
• Audible alarm and relays inhibited until Start up time has
elapsed.
Note: Used if the AFA4000 is a Slave unit with a common fan.
Remote master On/Off signal is used
Mute
When the input configured as Mute is activated:
AFA4000/1 Airflow Monitor / p.25
Function
Description
• Red LED on (Solid).
• Audible alarm muted.
• Mute Icon shown on display.
Note: The Mute function disables the pushbutton mute so that
any audible alarm can only be muted using the input, for
example remote key switch.
AFA4000/1 Airflow Monitor / p.26
3.7 Components
3.7.1 Airflow monitor components
• 1 – AFA4000/1 Airflow Monitor
• 1 – Airflow Sensor c/w 2 metre RJ45 Sensor Cable
• 1 – Plug in type low voltage power supply with 5 metre Cable
Figure 2: AFA4000/1 airflow monitor
AFA4000/1 Airflow Monitor / p.27
3.7.2 Auxiliary components
The following auxiliary components are available for the AFA4000/1 airflow monitor:
Component
Function
Sash High Proximity Switch
Used for Sash High Alarm
Sash High Micro Switch
Used for Sash High Alarm
Personnel Sensor
Passive Infra-Red sensor - used for Close Sash Alarm
Mains Fail Battery Unit
Used for Mains Fail Alarm
Temperature Sensor
Used for Temperature display and alarms
AFA4000/1 Airflow Monitor / p.28
4. Overview: Auto Sash Controller
The Auto Sash Controller automates the opening and closing of the fume hood sash.
Automation of the sash movement provides an increased level of safety to the controlled
environment. A sash cannot be accidentally left open and can respond to safety critical
inputs from external sources, such as fire alarms and ventilation system failures.
The Auto Sash Controller facilitates cost savings. When linked to ventilation controls, the
automatic closing of an unattended fume hood allows extractor fan speeds and
electricity consumption to be reduced.
4.1 Features
The Auto Sash Controller has the following features:
• Auto-Close
The sash automatically closes when the fume hood is
unattended.
• Auto-Open
The sash automatically opens when the user returns.
• Sash Lock
The sash is programmed to lock at a designated
position.
• Manual Sash
Open/Close
To open/close the sash manually.
• Keypad Pushbutton
Open/Close
To open/close the sash using the Keypad Pushbuttons.
• Footswitch
To open / close the sash using an optional, third party
supplied, footswitch.
• Tilt Switch
To disable the Auto Sash Control Unit using a, third
party supplied, tilt switch.
• Building Management
System (BMS) Inputs
The sash automatically closes when a signal is received
from the BMS.
• Building Management
System (BMS) Outputs
The Auto Sash Controller sends signals to the BMS
regarding the current status of the fume hood.
AFA4000/1 Airflow Monitor / p.29
4.2 Auto Sash control options
To open / close the fume hood sash the Auto Sash Controller is fitted with:
• A Tiptronic open/close control via the Sash Position Sensor.
• A Sash Low micro-switch
• A Sash Low proximity switch
4.2.1 Auto Sash Controller with Tiptronic open / close control
Tiptronic Open / Close control is the default control setup. It functions via a Sash
Position Sensor (sprung potentiometer) with a draw wire (1.2m long) attached to either
the sash or the counterweight. The Auto Sash Controller can then be calibrated to give
three methods of operation:
Method A - Close only
• The bottom position is calibrated.
• The sash automatically drives to the bottom position,
when the user is not present.
• Press the ↓ pushbutton to drive the sash to the
bottom position, when the user is present.
• The ↑ pushbutton is disabled.
Method B - 2 Positions
• The bottom and mid-positions are calibrated.
• The sash automatically drives to the bottom position,
when the user is not present.
• Press the ↓ pushbutton to drive the sash to the
bottom position, when the user is present.
• Press the ↑ pushbutton to drive the sash to the mid-
position, when the user is present.
• When the Tiptronic feature is enabled, manually tip
the sash upwards and the sash will drive to the midposition.
• Manually tip the sash downwards and the sash will
drive to the bottom position.
AFA4000/1 Airflow Monitor / p.30
• When the Auto Open feature is enabled, the sash
automatically drives to the mid-position when the
user is present.
• There is a time delay following user detection.
• When the Auto Lock feature is enabled and a Sash
Lock position has been calibrated, the Auto Close
feature is disabled and the sash locks in its current
position when the sash is raised to the Sash Lock
position or higher. This facilitates loading the Fume
Cupboard.
Method C – 3 Positions
• The bottom, mid and top positions are calibrated.
• The sash automatically drives to the bottom position,
when the user is not present.
• Press the Down pushbutton to drive the sash to the
bottom position, when the user is present.
• Press the Up pushbutton to drive the sash to the
next calibrated position, when the user is present.
• When the Tiptronic feature is enabled, manually tip
the sash upwards and the sash will drive to the next
calibrated position.
• Manually tip the sash downwards and the sash will
drive to the bottom position.
• When the Auto Open feature is enabled, the user is
present and the sash is lower than the mid position,
the sash automatically drives to the mid-position.
• There is a time delay following user detection.
• When the Auto Lock feature is enabled and a Sash
Lock position has been calibrated, the Auto Close
feature is disabled and the sash locks in its current
position when the sash is raised to the Sash Lock
position or higher. This facilitates loading the Fume
Cupboard.
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