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GT811 Schematic ( PDF Datasheet ) - SAFETY SYSTEMS TECHNOLOGY

Teilenummer GT811
Beschreibung Toxic Gas Sensor Manual
Hersteller SAFETY SYSTEMS TECHNOLOGY
Logo SAFETY SYSTEMS TECHNOLOGY Logo 




Gesamt 24 Seiten
GT811 Datasheet, Funktion
DESIGN MANUAL
Model GT811
Toxic Gas NOVA-Sensor
70018
The information and technical data
disclosed by this document may be
used and disseminated only for the
purposes and to the extent
s p e ci f i c al l y a u t h o r i ze d b y SAFETY
SYSTEMS TECHNOLOGY in writing. Such
information and technical data are
p r o p r i e t a r y to SAFETY
SYSTEMS
TECHNOLOGY and may not be used or
disseminated except as provided in the
foregoing sentence.
SAFETY SYSTEMS TECHNOLOGY
23282 Mill Creek Drive, Suite 215
Laguna Hills, California 92652
Phone 1-949-583-1857 Fax 1-949-340-6643
www.safetysys.com
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GT811 Datasheet, Funktion
INSTALLATION
INSTALLATION
MODEL GT811 TOXIC GAS NOVA-Sensor
The GT811 Unit
A complete GT811 unit consists of the following components:
• explosion-proof housing with MODE button, toxic sensor head, terminal blocks for
field wiring and transparent lid used to observe the operational status of the
numerical readouts and LED’s.
• electronics module consisting of a stack of 5 round printed circuit boards.
The field wiring is connected to the terminal blocks on the bottom of the enclosure. The
terminal blocks are accessible after removing the enclosure lid and the electronics
module.
The face plate (topmost printed circuit board) of the electronics module carries various
displays and controls. These are:
• Three-digit seven-segment LED display (numerical readout) for the display of gas
concentration and status.
• Four round LED’s, labeled “FAULT” (yellow), “HIGH” (red), “LOW” (red) and “CAL”
(green). These LED’s are used to signalize alarms and operating modes.
• Two square pushbutton switches, labeled “UP” and “DOWN”. These switches are
accessible with a small screw driver or ball point pen and can be used to adjust
the alarm setpoints of the unit.
Installation Sequence
The electronics module contains parts that are delicate and potentially sensitive to
electrostatic discharge (ESD). Thus, the electronics module should be plugged into the
terminal blocks in the enclosure right before system start-up, after all drilling and wiring
is completed. The recommended installation procedure is as follows:
• Mounting the enclosure
• Wiring of power and signal cables, and, if required, of remote sensor
• Setting the DIP switches and suitcase jumpers on the electronics module
• Checking the field wiring, plugging in the electronics module
• Applying 24VDC power
• Setting the alarm setpoints, if required
• Calibration and functional check out with CompTest, if required
Mounting the enclosure
The dimensional characteristics of the GT811 unit are shown in figure 811-1. It is
preferable to attach the sensor to a wall or bracket, using bolts through the two mounting
holes. However, these mountings may be omitted if the electrical conduit is sufficiently
rigid to support the weight of the detector.
The location of the sensor is important. For lighter than air gasses, such as Ammonia, the
sensor should be located above the spot where a leak is likely. For heavier than air
gasses, such as Hydrogen Sulfide, locate the sensor below the expected leak. However,
do not locate the sensors closer than 1 foot to a floor to prevent damage from water, dust,
etc.
DESIGN MANUAL
February, 2006
811-4
Free Datasheet http://www.datasheetlist.com/

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GT811 pdf, datenblatt
OPERATION
OPERATION
MODEL GT811 TOXIC GAS NOVA-Sensor
Power-Up
When power is first applied, the microcontroller executes a built-in test (BIT), during which
various internal components and parameters are checked. During the BIT, the indicator
lights will be flashing. Upon successful completion of the BIT, the NOVA-Sensor begins
a 30 second countdown period to allow time for proper temperature stabilization. The
countdown is displayed on the digital read-out. At the end of the countdown, the
NOVA-Sensor briefly displays its firmware revision code, e.g. “1.16”, and then begins
normal Protective Mode operation. In protective mode, the digital read-out displays
“000”. As a further verification that the unit is operating properly, the decimal points on
the digital read-out slowly rotate from one digit to the next while displaying 000. The
NOVA-Sensor is now operating at the factory default calibration and alarm setpoints. After
calibration, the most recent field calibration and alarm setpoint information will be stored
in the NOVA-Sensor’s non-volatile memory.
Non-Volatile Memory
Calibration data and alarm setpoints are maintained in non-volatile memory to insure
proper operation should the +24 VDC supply be temporarily interrupted. No special care
is required to maintain this memory.
Changing the Setpoints
Setpoints for HIGH alarm and LOW alarm are available for user modification. Factory
defaults for the LOW and HIGH alarms are as follows:
full scale
200
100
50
20
10
LOW
40
20
10
4
2.0
HIGH
100
50
25
10
5.0
The face plate of the electronics module provides two setpoint buttons (UP and DOWN).
To adjust either the HIGH or LOW setpoints, press either button. At this point, the LOW
alarm LED will turn on, and the LOW alarm setpoint will be displayed. The user has 5
seconds to begin to adjust the LOW Alarm setpoint by pressing the UP or DOWN button.
Once the microcontroller has detected 5 seconds of inactivity (no button press), the unit
will light the HIGH Alarm LED and display the previously stored setpoint value. The
operator will again have 5 seconds to begin adjusting the HIGH alarm setpoint. Setpoint
values will roll-over at 10.0, 20, 50, 100, or 200, depending on the full scale. After an
additional 5 seconds of inactivity, the NOVA-Sensor will store the new values in non-
volatile memory and return to normal operation.
Calibration
The NOVA-Sensor has to be calibrated on installation/commissioning and then later at
frequent intervals. Calibration will take care of changes in sensor performance and drift.
The automatic calibration procedure provides the NOVA-Sensor with reference points
DESIGN MANUAL
February, 2006
811-10
Free Datasheet http://www.datasheetlist.com/

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