3-Wire Explosion Proof Transmitter
Features
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Electrochemical, Infrared or catalytic bead sensors
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Wire powered (3-Wire), 12 to 35 VDC operating voltage
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Operating temperature range -40°C to +60°C
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LCD display with LED back-light
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3 Push-button interface (ADD, MENU, SUB)
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Non-intrusive buttons using magnetic wand
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2 Individually configurable alarms
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2 Front panel LED indicators (amber and red)
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2 Optional fully programmable alarm relays (dry contacts)
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Output options: 4-20mA (3-wire) analog, RS-485 Modbus, both standard Industry Applications
Description
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.
Sensor Options
| Gas Type | Range | T90 | Hazard Classification |
| LEL Catalytic | 0 – 100% (0-5% Vol.) | < 90 sec. | Class 1, Div 1 |
| CL2 | 0 – 10 ppm | < 60 sec. | Class 1, Div 2 |
| CLO2 | 0 – 1 ppm | < 120 sec. | Class 1, Div 2 |
| CO | 0 – 300 ppm | < 30 sec. | Class 1, Div 1 |
| CO2 | 0 – 5% vol. | < 30 sec. | Class 1, Div 1 |
| H2S | 0 – 100 ppm | < 30 sec. | Class 1, Div 1 |
| H2S 2K | 0 – 2000 ppm | < 25 sec. | Class 1, Div 1 |
| HCL | 0 – 30 ppm | < 300 sec. | Class 1, Div 2 |
| HCN | 0 – 30 ppm | < 70 sec. | Class 1, Div 2 |
| HF | 0 – 10 ppm | < 90 sec. | Class 1, Div 2 |
| LEL-IR | 0 – 100% (0-5% Vol.) | < 30 sec. | Class 1, Div 1 |
| LEL-IR-HC | 0 – 100% LEL | < 30 sec. | Class 1, Div 1 |
| NH3 | 0 – 100 ppm | < 90 sec. | Class 1, Div 2 |
| NH3 300 | 0 – 300 ppm | < 120 sec. | Class 1, Div 2 |
| NH3 A | 0 – 1000 ppm | < 120 sec. | Class 1, Div 2 |
| NO2 | 0 – 20 ppm | < 25 sec. | Class 1, Div 2 |
| O2 | 0 – 25 Vol. | < 15 sec. | Class 1, Div 1 |
| PH3 | 0 – 5 ppm | < 30 sec. | Class 1, Div 2 |
| SO2 | 0 – 20 ppm | < 35 sec. |
Class 1, Div 1 |
Specifications
| Sensor Type | Electrochemical, infrared, catalytic bead | |
| Operating Voltage | Wired power (3-Wire) 12 to 35 VDC | |
| Power Draw | 2 Watts maximum | |
| Protection | Power electromagnetic interference (EMI) filter
4-20 mA surge suppression RS-485 surge suppression |
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| Display Screen | 102×64 Resolution graphical LCD screen transflective (sunlight readable) with white LED backlight | |
| Interface | 3 Push-buttons (MENU, ADD and SUB)
3 Magnetic non-intrusive switches for calibration |
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| Customizable Settings | 2 Individual-configurable alarm LED/relay set-points | |
| Temperature Range | -40°C to +60°C (-40°F to +140°F) | |
| Output (digital) | RS-485 modbus | |
| Wired (Analog) Output | 4-20 mA (3-Wire)
Fault terminal, wet relay contact. Has it’s own power. Optional 2 dry-contact relays with replaceable 4 amp fuses. |
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| Product Dimensions | 5.5 in, L x 6 in. W x 7 in. H (8 in. W x 17 in. H Max. dimensions with attachments) | |
| Total Weight | 6 lbs. | |
| Remote Sensor Kit
(Optional Additional Feature) |
Remote sensor kit with enclosure (5 pin)
• Electrochemical sensor max. length: 250 feet • Infrared sensor max. length: 40 feet • Catalytic bead sensor max. length: 15 feet |
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| Hazardous Location
Approvals |
Main Enclosure | Certified explosion / flame proof CQPSUS
Class I, Division 1 & 2, Groups B, C & D Nema 3, 4, 4X, 7 (B, C, D) 9 (E, F, G) Temp.= -20°C to +60°C |
| Sensor Housing | Certified explosion / flame proof CQPSUS
Class I, Division 1 & 2, Groups B, C & D Temp.= -40°C to +60°C Note: Certification only applies to some gases. Toxic gases not certified for Div. 1 locations are suitable for Div. 2 applications but have no third party approval. |
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| Controllers | Controllers compatible with all RKI Beacon controllers, as well as most DCS / PLC systems: Beacon 110, Beacon 200, Beacon 410A, Beacon 800, and MC-6400 | |
| Warranty | 1-Year warranty for electronics and sensor | |