Series GSTA

Carbon Monoxide /

Nitrogen Dioxide

Transmitter

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Key Specifications

Surface Mount Configuration

Range 0 to 200 PPM / 500 PPM CO (Field Selectable) and 0 to 10 PPM NO2

Accuracy: 2% F.S. for CO; 3% F.S. for NO2 at Time of Calibration

Universal Output: Field Selectable 0 to 5 VDC / 0 to 10 VDC / 4 to 20 mA

Dip Switch Selection for Inverted Outputs and Zero Suppression

Key Specifications

Sensor Type: Industrial Grade

Electrochemical Sensor

Sensor Life 3 to 5 Years with Recommended

Calibration Check Every 6 Months

Field Replaceable

Remote LCD Display

Useful for Calibration

Sensor Technology

Gas Enters Sensor Through Capillary and Passes Through

Filter

Gas Goes Through Electrochemical Reaction Upon Contact

with Electrode (i.e. CO + H2O => CO2 + 2H+ + 2e-)

CO2 Released Diffuses into the Air, Hydrogen Ions Migrate

to the Electrolyte, and the Electrons Generate the Charge

on the Working Electrode

Sensor Technology

Secondary Oxidation Reaction Occurs (i.e. O2 + 4H+ + 4e-

=> 2H2O) at the Counter Electrode

Thus, Water Used to Create Electrons At One Electrode

and Electrons Used to Recreate Water At Other Electrode

When Two Electrodes are Connected, Small Current is

Generated Proportional To The Gas Concentration

Third Electrode Used is a Electrical Reference and is

located in the Electrolyte

Features and Benefits

Industrial Grade Electrochemical Sensor

Longer Sensor Life Leads to Less Frequent

Sensor Replacements

Higher Accuracy at Lower Concentrations

Allow Sensors to Require less Frequent

Calibrations

Field Replaceable Sensors

Transmitters Are Replaced Less Frequently

Features &

Benefits Remote LCD Display

Building Occupants Do Not See Readings

That They Do Not Understand

Lowers Transmitter Cost To Customer By

Having One Display for Multiple

Transmitters

Allows Customer To Know When Sensor

Reaches End of Life By Displaying “Bad

Sen”

Features and Benefits

Dip Switch Selectable Range

Reduces Inventory By Only Needing One

Model for 0 to 200 PPM or 0 to 500 PPM CO

Universal Outputs

Reduces Inventory by Only Needing One

Model for 0 to 5 VDC, 0 to 10 VDC, 4 to 20

mA

Works With Majority of Building

Management Controllers

Features and Benefits

Removable Terminal Blocks

Reduces Installation Time and Cost

Multiple Knockouts on Housing

Reduces Installation Cost By Allowing

Installer to Run Wire or Conduit to Nearest

Side of Housing

GSTA Future Product

Additions GSTB Communicating Transmitter with

BACNet and Modbus

GSTC Master Controller

Accepts Multiple GSTB inputs

Audible and Visual Alarms

Two Relay Outputs

Communications

Data Logging Capability

GSTA Applications

Underground Parking Garages

Monitor the Exhaust Gases From Automobiles

Signal To Building Management System to Operate Exhaust Fans and High Gas Level Warning Alarms

465 to 700 Square Meter Coverage Area

GSTA Applications

Loading Docks

Monitor the Gas Levels from Fork Lifts and

Trucks

GSTA Applications

Automobile Service

Bays or New Car

Dealerships

Monitor the Carbon

Monoxide from

Automobile Exhaust

Signal To Building

Management System

to Operate Exhaust

Fans and High Gas

Level Warning

Alarms

GSTA Applications

Boiler or Mechanical

Rooms

Monitor the

Combustion Gases

from Gas Fired

Boilers

Questions

To order a free catalog or for more information contact;

Dwyer Instruments, Inc., P.O. Box 373,

Michigan City, IN., 46361

Telephone: (800) 872-9141 or (219) 879-8000

Fax: (219) 872-9057

Internet address: www.dwyer-inst.com

E-mail: info@dwyer-inst.com