T3A Gas Detector


The T3A Series Gas Detector ambient air hazardous gas detector is a versatile assembly that uses an electrochemical, infrared, catalytic bead sensor element to detect a variety of gases. Wired power (12 to 35 VDC) with 4-20 mA analog and RS-485 Modbus outputs standard. Magnetic switches allow for non-intrusive calibration while in the field as well as full system settings and diagnostics.

The T3A represents the latest leading edge technology in fixed gas detection today.


Electrochemical, Infrared or catalytic bead sensors
Wire powered (3-Wire), 12 to 35 VDC operating voltage
Operating temperature range -40°C to +60°C
LCD display with LED back-light
3 Push-button interface (ADD, MENU, SUB)
Non-intrusive buttons using magnetic wand
2 Individually configurable alarms
2 Front panel LED indicators (amber and red)
2 Optional fully programmable alarm relays (dry contacts)
Output options: 4-20mA (3-wire) analog, RS-485 Modbus, both standard Industry Applications


Petrochemical plants
Water & wastewater treatment plants
Pulp & paper mills
Manufacturing facilities
Chemical plants



General Specifications

Product Specifications
Sensor TypeElectrochemical, infrared, catalytic bead
Operating VoltageWired power (3-Wire) 12 to 35 VDC
Power Draw2 Watts maximum
ProtectionPower electromagnetic interference (EMI) filter 4-20 mA surge suppression RS-485 surge suppression
Display Screen102×64 Resolution graphical LCD screen transflective (sunlight readable) with white LED backlight
Interface3 Push-buttons (MENU, ADD and SUB) 3 Magnetic non-intrusive switches for calibration
Customizable Settings2 Individual-configurable alarm LED/relay set-points
Temperature Range-40°C to +54°C (-40°F to +129°F)
Output (digital)RS-485 modbus
Wired (Analog) Input4-20 mA (3-Wire) Fault terminal, wet relay contact. Has it’s own power. Optional 2 dry-contact relays with replaceable 4 amp fuses.
Product Dimensions5.5 in, L x 6 in. W x 7 in. H (8 in. W x 17 in. H Max. dimensions with attachments)
Total Weight6 lbs.
Harware Warranty1-Year warranty for electronics and sensor

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