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Brand: Chromalox
Chromalox DTS-HAZ Heat Trace Digital Thermostat, 30 A
Description
Digital thermostat and power connection kit for heat traced pipes and tanks
The Chromalox DTS-HAZ is a microprocessor-based digital thermostat that also serves as the power connection kit for heat trace. It is used for freeze protection or process temperature maintenance of pipes and tanks and works with constant wattage, mineral-insulated or self-regulating heating cables. It switches up to 30 A through a solid-state relay, accepts 120 to 277 VAC, and is approved for ordinary areas, Class I Division 2 and IECEx/ATEX Zone II locations as printed in the data sheet.
Because the heating cable, AC power line, alarm and RTD are all wired inside the one NEMA 4X enclosure, no separate power connection kit is needed, which cuts labour and material. The enclosure mounts directly on the pipe through its integral stand-off, or on a wall with the optional kit. A 100 ohm platinum RTD with a 3 ft lead is included and can be pipe-mounted or used to sense ambient air.
Technical specifications
| Parameter | Specification |
|---|---|
| Models and PCN | DTS-HAZ (AC alarm), PCN 387364; DTS-HAZ-DC (DC alarm), PCN 316187 |
| Operating voltage | 120 to 277 VAC, 50/60 Hz, single phase |
| Output | 30 A solid state relay |
| Input | 100 Ω platinum RTD; probe 4 in (10.2 cm) long, 1/4 in (6.35 mm) diameter, 3 ft (1 m) lead wire; maximum RTD wire length 50 ft (15 m) to remain UL/cUL compliant |
| Control | On/off with programmable dead band 1 to 100 degrees (F or C); set points -80 deg F to 1100 deg F (-62 °C to 593 °C); F or C selectable |
| Soft start | User selectable integral soft start that removes self-regulating cable in-rush |
| Alarms | High temperature to 1150 deg F (621 °C), low temperature to -80 deg F (-62 °C), RTD failure; red LED on the front panel |
| Solid state alarm | AC version 12-277 VAC, 1.8 A RMS; DC version 0-42 VDC, 1.8 A RMS (customer supplied voltage); fail-safe, opens on loss of power; contact state selectable |
| Operating temperature | Hazardous areas -40 to 104 deg F (-40 to 40 °C); ordinary areas -40 to 140 deg F (-40 to 60 °C) |
| Enclosure | NEMA 4X, about 6.3 × 6.3 in (160 × 160 mm), integral pipe stand, optional wall mount; houses heating cable, AC power and sensor connections |
| Hazardous area approvals | UL, cUL: Class I, Div. 2, Groups A, B, C, D, T4A; ATEX CE 2903 II 3 G Ex dc ec IIC T4 Gc (Tamb -40 to +40 °C); IECEx ETL 14.0012X |
| Accessories | DTS wall mount kit (PCN 318043); RTD extension wire, 50 ft/15 m (308144); DTS high temperature adapter kit (390408) |
Programming, alarms and soft start
The set point, high and low temperature alarms, dead band, temperature units, soft start and alarm state are all programmed from the front panel push buttons, with LEDs for power, load and alarm and a large LED display for process values. The fail-safe solid state alarm closes or opens, as selected, on any alarm condition including loss of power, high or low temperature and RTD failure, so a building management system can see a dead thermostat as well as an out-of-range temperature. Soft start lowers the nuisance breaker tripping caused by the in-rush of self-regulating cable and can be disabled for non-heat-trace use.
Selecting and installing the DTS-HAZ
Above 500 °F (260 °C), or with mineral-insulated cable, Chromalox calls for the DTS high temperature adapter kit. Typical applications in the sheet are freeze protection of piping, process temperature maintenance and the same duties on tanks, across markets such as oil and gas, chemical processing, power generation, water treatment and food processing. Choose the AC alarm model DTS-HAZ or the DC alarm model DTS-HAZ-DC according to the voltage of the alarm circuit you will wire.
Before ordering confirm the cable type and total circuit current (maximum 30 A), supply voltage, whether the RTD senses the pipe or ambient air, the required area classification and temperature class, the cable entry arrangement and the mounting style. For other temperature instruments see temperature instrumentation, for example the JUMO safetyM STB/STW safety temperature limiter.
How the Chromalox DTS-HAZ works
An RTD sensor on the pipe sends the temperature to the controller. The controller compares it with the set point and the dead band. A solid-state relay then switches the heating cable on and off.
Where the DTS-HAZ is used
- Freeze protection of pipes
- Temperature maintenance of pipes
- Tank heating
- Constant wattage cables
- Self-regulating cables
Selection checklist for the DTS-HAZ
- Heating cable type
- Circuit load
- Supply voltage
- Alarm voltage type
- Set point range
- RTD position
- Pipe or wall mounting
- Cable entry points
Installation, commissioning and maintenance notes for the DTS-HAZ
Mount the enclosure on the pipe or on the wall and wire the heating cable, the supply, the alarm and the RTD. Enter the set point and the alarm limits. Check the RTD and the alarm at regular intervals.
Requesting a quotation for the Chromalox DTS-HAZ
Please send the heating cable type, the circuit load and the supply voltage. Seven Star LLC serves industrial customers in Oman and the GCC and replies with a quotation based on the information provided.
DTS-HAZ thermostat type
It is a microprocessor-based digital thermostat.
DTS-HAZ maker
It is made by Chromalox.
DTS-HAZ connection kit
It also serves as the power connection kit for heat trace.
DTS-HAZ cable types
It works with constant wattage, mineral-insulated or self-regulating cables.
DTS-HAZ switching
It switches up to 30 A through a solid-state relay.
DTS-HAZ supply voltage
The supply is 120 to 277 VAC single phase.
DTS-HAZ one enclosure
The cable, the supply, the alarm and the RTD are wired inside one enclosure.
DTS-HAZ labour saving
No separate power connection kit is needed.
DTS-HAZ RTD
A 100 ohm platinum RTD with a 3 ft lead is included.
DTS-HAZ RTD use
The RTD can be pipe-mounted or used to sense ambient air.
DTS-HAZ control mode
Control is on and off with a programmable dead band.
DTS-HAZ dead band
The dead band is 1 to 100 degrees.
DTS-HAZ set points
Set points run from minus 62 to plus 593 degrees C.
DTS-HAZ temperature units
Fahrenheit or Celsius can be selected.
DTS-HAZ soft start
A selectable soft start removes self-regulating cable in-rush.
DTS-HAZ alarms
Alarms cover high temperature, low temperature and RTD failure.
DTS-HAZ alarm LED
A red LED on the front panel shows an alarm.
DTS-HAZ AC alarm
The AC version has a solid-state alarm for 12 to 277 VAC.
DTS-HAZ DC alarm
The DC version has a solid-state alarm for 0 to 42 VDC.
DTS-HAZ fail-safe alarm
The alarm opens on loss of power.
DTS-HAZ models
Models are the DTS-HAZ and the DTS-HAZ-DC.
DTS-HAZ mounting
The enclosure mounts on the pipe stand-off or on a wall with the optional kit.
DTS-HAZ enclosure size
The enclosure is about 160 by 160 mm.
Thermostat records for the DTS-HAZ
Record the set point, the alarm limits and the date of each check.
Choosing the right DTS-HAZ model
Choose the AC or DC alarm version to match the alarm circuit.
Documents and quotation
The Chromalox DTS Series data sheet is attached for this page. Seven Star LLC, an independent supplier in Muscat, quotes from the model name and quantity; stock and lead time are confirmed at quotation.
Datasheets & Documents
- Datasheet Chromalox DTS Series Heat Trace Digital Thermostat model sheet (catalog pages, English) Download
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About brand
Chromalox is an American manufacturer of electric process heating, heat trace and thermal control products. The company was founded in 1917 by Edwin L. Wiegand and, according to its website, is today part of Spirax Group. Its catalog spans immersion and circulation heaters, tubular and strip heaters, heat trace cables and controls, and temperature and power controllers.
Industrial heaters and heat trace
The industrial range covers screw plug and flanged immersion heaters, over-the-side heaters, air and radiant heaters, steam generators and packaged process heating systems. Heat trace products include constant wattage, self-regulating and mineral-insulated cables, with thermostats, controllers and connection kits for freeze protection and process temperature maintenance.
Controls and requesting a quote
Controllers run from single-loop temperature and process controllers to SCR power controllers and heat trace controllers. Seven Star LLC, an independent supplier in Muscat, lists selected Chromalox models for projects in Oman and the GCC. Send the full model code, voltage, kW or wattage and the fluid or application, and we will prepare a quotation from the Chromalox data sheet.
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Frequently Asked Questions
What load can the DTS-HAZ switch?
It has a 30 A solid state relay output and operates from 120 to 277 VAC, 50/60 Hz, single phase.
Which heating cables does it work with?
Constant wattage, mineral-insulated and self-regulating heating cables, in ordinary areas, Class I Division 2 and IECEx/ATEX Zone II locations.
What is the difference between DTS-HAZ and DTS-HAZ-DC?
They differ in the solid state alarm: DTS-HAZ is rated 12-277 VAC and DTS-HAZ-DC is rated 0-42 VDC, both 1.8 A RMS and customer supplied voltage.
Which sensor is included?
A 100 ohm platinum RTD with a 4 in probe and 3 ft lead is included; extension up to 50 ft keeps UL/cUL compliance.
What is the soft start feature?
It removes the in-rush current of self-regulating cable to reduce nuisance breaker tripping, and it can be disabled for non heat trace loads.
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