TVOC SYSTEM PLUS MANUAL
Ion Science Ltd
Page 7 of 13
Unrivalled Detection. www.ionscience.com
Installation
System Plus can be wall mounted or used as a stand-alone instrument as all input and output connections
are via the top of the cabinet. There are pre-drilled wall mounting holes located in the back wall of the
cabinet which should have gland or stopper fitted if using the System Plus as a stand-alone instrument.
Electrical Installation
System Plus has been designed to work from a 15V DC 1A supply, an optional mains supply can be used
(see optional extras). Space has been provided on the din rail to install an optional mains power supply.
The external 15V DC supply must be fused at 1A before entering the cabinet.
The supply is connected to the internal terminals, see drawing below
15V power
15V positive terminal number 8
15V zero to terminal number 7
Flow Fail Switch
A flow switch is provided to detect a flow failure, caused by either a faulty pump or completely blocked
inlet/outlet,
In the event of a flow failure, a fail relay operates the flow fail switch providing indication via a red led and
volt free changeover terminal contacts.
Common terminal number 1
Normally Closed Contact terminal number 2
Normally Open Contact terminal number 3
Please note. The relay is a failsafe type operation and is normally energised with no fault.
The flow fail switch can be used in series with the TVOC mA output to provide a remote fault indication or to
switch external visual and audible alarms.
