TQ Environmental Limited
Page 9 of 43 17654PM Issue: 3 December 2022
2.1 Adaptor PCB
The Adaptor Board terminates each sensor input and is configurable to accept either 2 or 3
wire 4-20mA or Pellistor type sensors. Links are provided to select the 4-20mA sensor, and
an ‘input card’ is fitted to provide the bridge voltage and zero function for the Pellistor sensor.
The Adaptor Board sends the sensor input data to the Control Board. Also included on the
Adaptor Board are LED’s and fuses for the 5V and 24V DC power supplies.
2.2 Control Board
The Control PCB is a microcontroller based unit which; accepts the data from each input,
monitors the sensor levels for alarm and malfunction and sends this information to the
Display.
In an Alarm or Fault condition the Control PCB also sends data to the Relay PCB and any
fitted Remote Relay PCB’s.
The TQ8000 Touch configuration data is stored on the Control PCB in a non-volatile
EEPROM memory, and can be re-configured using the on screen menu system.
2.3 Display
This is a 7” TFT Display with Touch Screen capabilities. The Display is connected to the
Control Board via a HDMI connector and a USB connector for the Touch Screen controller.
The Display shows the 8 channels of data on a page by page basis depending on how many
channels are selected. The data displayed for each channel is the Location Name, Gas
concentration, and Sensor Name. The right hand pane of the display shows the overall
system status. At the bottom of the display are four buttons; MENU, MUTE, RESET, and
LOG.
2.4 Relay Board (Local)
This PCB has 16 relay SPCO outputs, and is fitted under the Adaptor Board. All of the relays are
configurable to operate for any level of alarm on any of the eight channels. The TQ8000 Touch
provides a ‘Latched’ or ‘Non-Latched’ and ‘normally On’ or ‘Normally Off’ configuration for individual
relays.
A ‘Latched’ relay will require a ‘Reset’ function, whereas the ‘Non-Latched’ relay will reset
automatically only when the input alarm trip level has cleared.
Also relays can be mutable, which means that once a sensor has gone beyond the alarm level the
relays can be reset so that they will not switch on again until the sensor goes back into alarm.
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