- Barksdale Master Distributor in the UK and Ireland
- UK technical support available
- Application and configuration support
Barksdale Kelvin ATEX/IECEx Temperature Controller and Limiter
Provides electronic temperature control and limiting for electric trace-heating and industrial process applications in hazardous areas.
Key highlights
- Flexible control: Controller, limiter or combined controller/limiter options
- Hazardous area: ATEX/IECEx Ex component-certified BHTC/BHTL for Zone 1/2; BHTLC for Zone 2
- Wide temperature range: Controls from 0 to 500°C with measurement from -60 to 500°C
- Heat-trace switching: Up to 30 A for BHTC/BHTL, with BHTLC limited to 22 A
- Interface options: Dial setpoint, LED, Modbus and Bluetooth options
The Barksdale Kelvin is designed for hazardous area electric trace heating, providing electronic temperature measurement, monitoring, control and limiting within industrial temperature-control systems. BHTC, BHTL and BHTLC configurations provide controller, limiter or combined controller/limiter functions according to the required application.
Typical applications include freeze protection, process temperature control, over-temperature control and viscosity control, where pipework, tanks and other heated equipment must remain within the required temperature range.
Kelvin is relevant both to plant engineers specifying temperature control and to OEM and system integration requirements, where heat-trace manufacturers and system integrators incorporate electronic temperature control into wider equipment or heat-trace assemblies.
Kelvin is supplied as an ATEX/IECEx Ex component rather than a stand-alone finished enclosure. BHTC and BHTL configurations are certified for EPL Gb/Db applications, while BHTLC is certified for EPL Gc/Dc applications. The selected configuration must therefore be incorporated into suitable equipment or an enclosure and matched to the hazardous area, control function and installation requirements of the final application.
Key Features
- Hazardous area certification: BHTC and BHTL are ATEX/IECEx Ex component-certified for EPL Gb/Db applications, while BHTLC is Ex component-certified for EPL Gc/Dc applications.
- Trace-heating compliance: Controller, limiter and combined controller/limiter configurations meet the applicable IEC/IEEE 60079-30-1 requirements within their certified EPL scope.
- Two-point control and fault response: Heater operation is controlled according to measured temperature, setpoint and hysteresis, with the heater de-energised if a sensor or device malfunction is detected.
- Temperature limiter operation: Limiter configurations de-energise the heater when the limiting temperature is reached and require a manual reset before heating is restored.
- Remote Modbus access: Modbus RTU configurations support remote parameter setting and monitoring of operating and device-status information.
- Local Bluetooth access: Bluetooth-equipped configurations support local programming and monitoring without opening the final enclosure, subject to use of a suitable programming device for the hazardous area.
- Diagnostic monitoring: Available status functions identify temperature warnings, sensor faults, relay-life warnings and device over-temperature conditions through the fitted interfaces.
- Installation flexibility: DIN rail clip or panel mounting supports integration into the suitably protected enclosure required for the final installation.
Specifications
| Models and Functions | |
| Product Series | BHTx Kelvin |
| BHTC Function | Temperature controller |
| BHTL Function | Temperature limiter |
| BHTLC Function | Combined temperature controller and limiter |
| Number of Circuits | Single circuit |
| Control Method | Two-point control |
| Temperature Measurement and Control | |
| Temperature Control Range | 0 to 500°C |
| Temperature Measurement Range | -60 to 500°C |
| Temperature Input | Pt100 RTD |
| Measurement Accuracy | ±0.5% FS |
| Temperature Units | °C / °F |
| Default Hysteresis | 5 K / 9°F |
| Power and Electrical | |
| BHTC / BHTL Supply Voltage | 85 to 250 VAC; up to 277 VAC subject to relay-life limits |
| BHTLC Supply Voltage | 85 to 250 VAC |
| Rated Power Without Load | 4.5 W |
| Switching / Load Current | Up to 30 A for BHTC/BHTL; BHTLC maximum 22 A, subject to certified thermal and electrical limits |
| Maximum Breaker Size | 32 A maximum, subject to applicable load limits |
| Optional Alarm Relay | 2 A resistive load at 250 VAC or 36 VDC; up to 277 VAC subject to relay-life limits |
| Configuration and Communications | |
| Setpoint Configuration | Dial, Modbus or Bluetooth depending on configuration; configurations without a dial may use a factory-configured fixed setpoint |
| Modbus | Modbus RTU, 9600 baud, 8-N-1 |
| Bluetooth | Available depending on configuration |
| LED Status Indication | Available depending on configuration |
| Installation and Environmental | |
| Mounting | DIN rail clip or panel |
| Enclosure Requirement | Installation in a suitable enclosure providing at least IP65 protection in accordance with the certification schedule |
| UV Exposure | Kelvin must be installed so that it is not susceptible to UV light |
| Load Derating | Allowable load current depends on ambient/service temperature and permitted surface temperature |
| Hazardous Area and Compliance | |
| Certification Status | Ex component requiring incorporation into suitable equipment or an enclosure for use in explosive atmospheres |
| Trace-Heating Standard | IEC/IEEE 60079-30-1 within the certified scope of the applicable configuration |
| IECEx Certificate | IECEx DEK 19.0014U, Issue 2 |
| BHTC / BHTL IECEx Marking | Ex eb mb [ib] [60079-30-1] IIC Gb; [Ex ib 60079-30-1 Db] IIIC |
| BHTC / BHTL ATEX Certificate | DEKRA 19ATEX0028U, Issue 2 |
| BHTC / BHTL ATEX Marking | II 2 G Ex eb mb [ib] [60079-30-1] IIC Gb; II (2) D [Ex ib 60079-30-1 Db] IIIC |
| BHTLC IECEx Marking | Ex eb mb [ib] [60079-30-1] IIC Gc; [Ex ib 60079-30-1 Dc] IIIC |
| BHTLC ATEX Certificate | DEKRA 25ATEX0021U, Issue 0 |
| BHTLC ATEX Marking | II 3 G Ex eb mb [ib] [60079-30-1] IIC Gc; II (3) D [Ex ib 60079-30-1 Dc] IIIC |
| North American Design | Designed for Class I, Division 2 |
Support
Able Instruments is Barksdale’s Master Distributor in the UK and Ireland, providing application guidance, configuration support and technical assistance for Kelvin temperature-control requirements.
- Application guidance: Selection support for controller, limiter or combined controller/limiter duties and the required hazardous area classification
- Configuration support: Guidance on electrical load, alarm relay and dial, Modbus or Bluetooth options
- Technical support: Pre-sales advice on enclosure requirements, certified operating limits and correct application of the Kelvin Ex component
- OEM and system support: Assistance for heat-trace manufacturers and system integrators incorporating Kelvin into wider equipment or control assemblies