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PDF GT811 Data sheet ( Hoja de datos )
| Número de pieza | GT811 | |
| Descripción | Toxic Gas Sensor Manual | |
| Fabricantes | SAFETY SYSTEMS TECHNOLOGY | |
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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
Free Datasheet http://www.datasheetlist.co
1 page  
TECHNICAL SPECIFICATIONS
MODEL GT811 TOXIC GAS NOVA-Sensor
of the GT811 is slightly different from those of the standard GT811. Details on the variants
are listed in the section “Low-Power Version” at the end of this manual.
TECHNICAL SPECIFICATIONS
Power Supply (standard version) . .24 volts DC nominal, 80 mA standby, 140 mA when in
alarm. Will operate within specifications at any
supply voltage between 16 and 32 volts.
Power Supply (low-power version)
.24 volts DC nominal, 50 mA standby (display off),
75mA standby (display on), 140 mA when in
alarm. Will operate within specifications at any
supply voltage between 16 and 32 volts.
Response time . . . . . . . . . . . .20 Seconds - SO2
35 Seconds - CO
60 Seconds - H2S
90 Seconds - CL2 or NH3
Maximum time required to reach 90% of the
final measured concentration.
Operating Temperature
. . . . . . .-40 to +131o F. -40 to +55o C (H2S, SO2)
+23 to +131o F. -5 to +55o C (CO)
- 13 to +131o F. -25 to +55o C (NH3)
+5 to +131o F. -15 to +55o C (CL2)
May be operated intermittently up to 150o F.
Operating Humidity . . . . . . . . .Relative Humidity 0-100% non condensing
Sensitivity . . . . . . . . . . . . . .16 mA/full scale output per PPM.
Automatically adjusted during calibration
Accuracy . . . . . . . . . . . . . . .Linear response between 0 and full scale.
Output drift less than 2% of full scale per month.
Relay Contact Ratings . . . . . . . .6 amps @ 28 VDC resistive
6 amps @ 300 VAC resistive
1/8 HP @ 120/240 VAC
Analog Output . . . . . . . . . . . .Sensor will source 0-20 mA DC into a load of
600 ohms or less.
Optional Digital Output . . . . . . . .Designed per EIA-485 to permit bi-directional
communication between detectors and data
acquisition system over shielded twisted pairs.
DESIGN MANUAL
February, 2006
811-3
Free Datasheet http://www.datasheetlist.com/
5 Page 
INSTALLATION
Cable considerations
MODEL GT811 TOXIC GAS NOVA-Sensor
Two conductors are required between the Model GT810 Sensor and the GT811
electronics. These wires will be carrying a maximum of 20 mA at 24 volts DC to provide
the required operating current to the loop powered sensor transmitter. In general, the
length of cable is not critical, as long as the total resistance of the cable does not exceed
650 ohms.
It is important to specify shielded cable, or to install the wires in metallic conduit. Ground
the cable shield to the ground screw in the electronics housing. Excessive noise picked
up in the cables can make the display on the NOVA-Sensor jump between various values
and can make calibration impossible. This is because the noise makes the NOVA-Sensor
believe that the gas values are constantly changing. A constant gas value is the criteria
for the end of a calibration.
Cable Color Codes
The GT810 gas sensor head is supplied with two color coded wires which connect to the
terminals S and 01 in the GT811 electronics package. These wires are colored Red and
Black. If possible, use cable with the same color code to connect between the sensor and
the electronics. If different colors are used, be extremely careful to connect each lead to
the proper terminal. Interchanging two wires will almost always result in a burned out
sensor.
DESIGN MANUAL
Figure 811-4 Installation with a remote sensor
February, 2006
811-9
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet GT811.PDF ] | |
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