Honeywell Sensepoint XCD RTD Remote Toxic Gas Detector

Overview

The Honeywell Sensepoint XCD RTD (Remote Toxic Detector) is a flameproof gas transmitter designed for use with Honeywell Sensepoint toxic and oxygen sensors. The sensor can be mounted directly on the transmitter or remotely, up to 30 metres (100 feet) away, so the transmitter and its display can be placed where they are easy to see and reach while the sensor sits at the point where gas is most likely to collect. The data sheet positions it for industrial manufacturing, power plants, waste water facilities, utilities, food and beverage production, refineries and chemical plants, onshore oil and gas terminals, production platforms and exploration and drilling.

Seven Star LLC supplies the Honeywell Sensepoint XCD RTD to oil and gas operators, EPC contractors, utilities and process plants in the Sultanate of Oman and across the GCC. Hydrogen sulphide detection on sour gas facilities, chlorine and ammonia detection in water and waste water plants, and oxygen deficiency monitoring in enclosed spaces are typical duties in Oman. Our team in Muscat offers engineering support, helping select sensor gas, range, housing material and accessories for each detection point.

Measurement Principle

The Honeywell Sensepoint XCD RTD itself is a transmitter: it powers the connected Sensepoint sensor, reads its signal, displays the gas concentration and manages outputs and alarms. The Sensepoint toxic and oxygen sensors use electrochemical cells, which, in general terms, produce a small current proportional to the concentration of the target gas reaching the electrode. Honeywell specifies Surecell technology to maintain performance at extremes of temperature and humidity and lists long-life sensors. The sensor connects to the transmitter as a 2-wire 4-20 mA source device, either at the M25 bottom entry or through a remote junction box or duct mounting assembly.

The Honeywell Sensepoint XCD RTD compares the reading against two programmable alarm levels and drives three relays and a 4-20 mA output. Default current levels indicate fault (below 1.0 mA), inhibit during configuration (2.0 or 4.0 mA), normal gas measurement (4.0 to 20.0 mA) and over range (22.0 mA). Outputs are inhibited automatically during adjustment, which reduces the risk of false alarms at the control panel during maintenance. A generic 4-20 mA input option also allows other compatible sensors to be connected.

Engineering Design of the Honeywell Sensepoint XCD RTD

The Honeywell Sensepoint XCD RTD housing is epoxy-painted LM25 aluminium alloy (about 2.0 kg) or 316 stainless steel (about 5.0 kg), with an integral mounting plate for four M8 bolts and an optional pipe mounting kit for horizontal or vertical pipes. European ATEX and IECEx versions have two M20 side entries and one M25 bottom entry. The transmitter is rated IP66 and the sensor IP67. Certification is listed as ATEX Ex II 2 GD Ex d IIC Gb T6 and IECEx Ex d IIC Gb T6 for ambient temperatures of –40 to +65 °C, with dust protection Ex tb IIIC T85 °C Db.

The large tri-colour backlit LCD of the Honeywell Sensepoint XCD RTD shows digits, a bar graph and icons; it is steady green in normal operation, flashing yellow for a fault and flashing red for an alarm. Range, relay operation, alarm set points and tag number are adjusted with non-intrusive magnetic switches, allowing one-person maintenance without opening the enclosure. The Sensepoint sensor has an intrinsically safe section with a removable cartridge, so the cartridge can be changed without a hot work permit. Supply is 18 to 32 V DC (24 V DC nominal) with a maximum consumption of 5 W, and the 18 screw terminals accept 0.5 to 2.5 mm² wire.

Key Features

The main features of the Honeywell Sensepoint XCD RTD from the Honeywell data sheet are listed below.

• The sensor of the Honeywell Sensepoint XCD RTD can be mounted directly or up to 30 m from the transmitter, ideal for points that are difficult to access.
• It works with Honeywell Sensepoint sensors for H2S, CO, NH3, Cl2, O2, H2, SO2, NO and NO2.
• The tri-colour backlit display shows normal, fault and alarm status clearly, even from a distance.
• Three relays rated 5 A at 250 V AC provide two programmable alarms and one fault output.
• The 4-20 mA output is selectable as sink or source to suit different control systems.
• Non-intrusive magnetic switches allow configuration and calibration without opening the flameproof housing.
• Aluminium LM25 or 316 stainless steel housings are available for normal and corrosive environments.
• The common XCD transmitter platform reduces training, spares and stock costs across a site.

Industrial Applications

In Oman the Honeywell Sensepoint XCD RTD is well suited to H2S monitoring around wellheads, separators, sour gas plants and pump stations, where the transmitter can be fixed at an accessible height while the sensor is installed close to the potential leak source. In desalination and waste water plants the remote configuration helps monitor chlorine dosing rooms and digesters, while ammonia versions suit refrigeration plants and fertiliser facilities in Sur and Sohar. Oxygen sensors protect personnel in nitrogen-purged enclosures and analyser shelters, and duct mounting assemblies allow sampling in ventilation systems.

Seven Star LLC supplies the Honeywell Sensepoint XCD RTD along with related Honeywell detectors such as the Honeywell SPXCDASMTXF Sensepoint XCD IR flammable detector, the Honeywell XNX Excel gas detector and the Honeywell Searchline Excel Plus open path detector. Our engineers in Muscat support customers across Oman and the GCC with detector selection, layout review and spare sensor cartridges.

Technical Specifications

The following Honeywell Sensepoint XCD RTD data come from Honeywell data sheet DS01090.

How to Order

To order the Honeywell Sensepoint XCD RTD, send Seven Star LLC the target gas and range, housing material, cable entry type and whether the sensor will be local or remote, together with any accessories such as sunshade, duct mount or pipe mount kit. Our team in Muscat will confirm the configuration, share the technical datasheet for download and prepare a formal quotation. Seven Star LLC supplies Honeywell gas detection equipment across Oman and the GCC with engineering support.