A flameproof (Ex d) pellistor-based flammable gas detector with a display & 4-20mA output for hydrocarbon, hydrogen & petrol gas and vapour detection.
The Crowcon TXgard Plus is a Flameproof (Ex d), ATEX, IECEx, and UL-certified toxic and oxygen gas detector with an LCD display and non-intrusive calibration. The electrochemical sensor has a stainless steel flameproof housing. A marine-grade alloy junction box contains an amplifier/transmitter to provide a 3-wire 4-20mA output.
The TXgard-Plus detector has a 3-digit LCD with a backlight and LED status indicator to provide a user interface, and calibration is performed using a magnetic wand (supplied). The junction box is available with M20, 1/2″ or 3/4″ NPT cable entries.
Suitable for various applications, including water treatment, oil and gas exploration, chemical plants and steel production.
Features
Non-intrusive calibration
- Calibration can be performed locally without hot work permits and minimises operational downtime.
- Local display and buttons enable calibration without opening the junction box
Flexible output options
- 4-20mA current sink or source – works with a wide selection of control panels
- Three-wire format
- Optional relays for alarm and fault – can be used for switching local alarms
Rugged and reliable
- Constructed using marine-grade aluminium with a stainless steel sensor housing – proven track record for operation in the harshest environments
- Ingress protection to IP65 as standard
- Operating temperature –10 to +55ºC (sensor dependant)
Low cost of ownership
- Non-intrusive one-person calibration – easy to operate and maintain
- Long-life sensors – keep interruption to on-site activity to a minimum
- Simple parts replacement
Sensor choice
- Carbon Monoxide, Hydrogen Sulphide and Oxygen
Specifications
| Size | 200 x 115 x 115mm (7.9 x 6.1 x 6.1ins) |
| Weight | 2.2kg (4.9lbs) |
| Ingress protection | IP65 |
| Enclosure material | Junction box: Marine-grade alloy Sensor housing: 316 stainless steel |
| Power | 10-30Vdc, 210mA max (relay version) 160mA max (non-relay) |
| Cable entries | 2 x M20 or 1/2” NPT |
| Operating temperature | -10°C to +55°C (-14°F to 131°F) * |
| Humidity | 15 to 90% RH non-condensing |
| Relays (optional) | SPNO or SPNC contacts rated 30Vdc 1A (non-inductive load) for Alarm 1, Alarm 2, Fault |
| Display | 3-digit LCD back-lit display, LED status indicator |
| Calibration method | Via magnetically operated buttons |
| Electrical output | Three-wire 4-20mA sink or source |
| Terminals | Suitable for up to 1.5mm2 cable |
| Sensor type | Electrochemical |
| Repeatability | +/- 2% FSD typically |
| Zero drift | +/- 2% FSD, six months typically |
| Response time | Contact Crowcon for a full list of sensor response times |
| Performance | Tested in accordance with EN60079-29-1 |
| Hazardous area zones | Zone 1 or 2 |
| Approvals | Ex II 2 G Ex db IIC T6 Tamb -20°C to +55°C |
| EMC compliance | EN 50270, FCC: CFR 47 Part 15, ICES-003 |
