RTAS RTAS-EP
http://www.chromalox.com
PDS DL CONTROLS
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Single Point
On/Off
Temperature
Controls
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Ambient Sensing
•
•
•
•
120 - 480 Vac
0 - 225˚F Temp. Rating
9/16” OD x 4” SS Probe
Ordinary & Hazardous
(Div. 2) Areas
Bulb & Capillary
• 120 - 480 Vac
• 0 - 400˚F Set Point Range
• 1/4” OD x 7-1/4”
SS Bulb, SS Capillary
• Ordinary & Hazardous
(Div. 2) Areas
Description
Features
The DL Series Single Point On/Off
Temperature Controls from Chromalox
represents the state of the art in heat
tracing accessories and are available
in five models to handle a broad
range of applications. Models include
two ambient sensing thermostats and
two line sensing thermostats. These
high-quality models combine a variety
of functions in a convenient, easy to
use and economical package.
• Integrated controls and power
connections reduce installation
hardware
• Molded of durable plastic material
(Ryton® PPS)
• High service temperature
• Corrosion resistant
• Thermal stability
• Non-flammability
• High strength and rigidity
• Stainless Steel sensor sheaths
• Sealed Switches on EP models
permit control in Div. 2 hazardous
areas
• Stainless steel hardware to ensure
the integrity of the system
• Cable terminations inside enclosure
reduce installation time and cost
• Liquid-resistant design prevents
moisture from reaching the electrical
connections. All models are
rated NEMA 4X.
• UL, FM, CSA is carried by most
models, consult specific product
information.
Applications
• Freeze Protection
• Hydrocarbon and Chemical
Product Piping
• Process Temperature Maintenance
• Fluid Flow and Viscosity
Maintenance
Approvals*
UL Listed for use in ordinary areas
CSA Certified for use in ordinary and
Class I, Div. 2, Groups A, B, C, D
Class II, Div. 2, Groups F, G
Ryton¤ is a registered trade name of Phillips
Chemical Company.
FM - Factory Mutual Certified for use
in ordinary and
Class I, Div. 2, Groups B, C, D
Class II, Div. 2, Groups F, G
Class III, Div. 2 areas
* Depends on specific model
PRECISION HEAT AND CONTROL
PH: 888-996-9258 • FX: 615-793-3563
www.chromalox.com
©
2003 Chromalox, Inc.
http://www.chromalox.com
DL — Single Point On/Off Temperature Controls
Available Models
RTAS & RTAS-EP
Ambient Sensing
Model RTAS is an ambient-sensing thermostat which is
generally used for freeze protection in ordinary (nonhazardous) areas. The thermostat is mounted through
the end of the oblique sided enclosure lid. In fact,
because there is so much room in this model, multiple
heating cables can be terminated. The stainless steel
sheathed, inverted bellows probe provides good sensitivity, resulting in more accurate control.
Model RTAS-EP is a modified version of the Model
RTAS which utilizes a sealed switch. Since this switch
has no arcing contacts it can be used in Division 2
Hazardous Areas.
RTBC & RTBC-EP
Bulb & Capillary
Model RTBC is a line-sensing thermostat which is
generally used for process temperature maintenance
applications in ordinary (non-hazardous) areas.
The thermostat is mounted within the enclosure and the
capillary is brought out through one of the openings in
the bottom of the box. This design provides extra protection for the capillary, especially when the control is
mounted on a pipe, for heat tracing applications. The
three foot long stainless steel capillary provides good
flexibility in mounting locations.
Model RTBC-EP is a modified version of the RTBC
which utilizes a sealed switch. Since this switch has no
arcing contacts it can be used in Division 2 Hazardous
Areas.
Exterior Construction
F
5.25"
(13.3 cm)
4.25"
(10.8 cm)
5.25"
(13.3 cm)
4.25"
(10.8 cm)
3"
(7.6 cm)
E
D
D
F
E
6.25"
(15.9 cm)
C
A
B
G
6.25"
(15.9 cm)
A
B C
A
Strategically placed cable entries allow maximum
flexibility for insulation (Heating cable cut away
for clarity)
A
Strategically placed cable entries allow maximum
flexibility for insulation (Heating cable cut away for
clarity)
B
Stainless steel tiedown support provides positive
attachment to pipes
B
Stainless steel tiedown support provides positive
attachment to pipes
C
Heavy duty support legs give stable mounting and
provide conduit clearance for applications with up to
three inches of insulation
C
Heavy duty support legs give stable mounting and
provide conduit clearance for applications with up
to three inches of insulation
D
Opening for 3/4-inch (20 mm) conduit hub
D
Opening for 3/4-inch (20 mm) conduit hub
E
Stainless steel sheath temperature sensor
E
Oblique sided box and cover allow easy access for wiring
F
Oblique sided box and cover allow easy access for
wiring
F
Stainless steel capillary (3 feet/1 meter long)
G
Stainless steel sensing bulb
2
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 888-996-9258 • FX: 615-793-3563 • www.chromalox.com
http://www.chromalox.com
DL - Single Point On/Off Temperature Controls
Interior Construction
Each model consists of a NEMA 4X corrosion resistant wiring and control enclosure with terminal block, enclosure support,
on/off thermostatic control and sensor. The enclosure has a 3/4” opening to accept a conduit hub (CCH-2 or equivalent). A
pipe strap (PS Series pipe straps or equivalent) is required to mount the enclosure on a pipe. A mounting plate (MP Series) is
required to mount the enclosure to a flat surface.
RTAS
A
G
C
F
B
C
D
E
B
A
E
F
G
D
Cable grommet provides water resistant seal between base
and box
Three position terminal block for easy wiring
Power wiring entry. Conduit hub not included
Gasket provides water resistant seal between box and lid.
It is affixed to the lid and captures the mounting hardware
Thermostat switch
Set point adjustment knob
Set point indicator
RTAS-EP
A
G
C
B
C
D
F
E
B
H
A
E
F
G
F
H
D
Cable grommet provides water resistant seal between base
and box
Three position terminal block for easy wiring
Power wiring entry. Conduit hub not included
Gasket provides water resistant seal between box and lid. It is
affixed to the lid and captures the mounting hardware
Hermetically sealed thermostat switch
Set point adjustment knob
Set point indicator
Ground wire connector
RTBC
A
D
F
G
E
B
B
C
D
A
E
F
G
H
H
Cable grommet provides water resistant seal between base
and box
Three position terminal block for easy wiring
Power wiring entry. Conduit hub not included
(Not shown in picture)
Gasket provides water resistant seal between box and lid.
It is affixed to the lid and captures the mounting hardware
Thermostat mounting bracket
Set point adjustment knob
Thermostat switch
Stainless steel sensing bulb
RTBC-EP
A
G
C
F
D
B
E
B
C
D
A
H
I
E
F
G
H
I
Cable grommet provides water resistant seal between base
and box
Three position terminal block for easy wiring
Power wiring entry. Conduit hub not included
(Not shown in picture)
Gasket provides water resistant seal between box and lid.
It is affixed to the lid and captures the mounting hardware
Thermostat mounting bracket
Set point adjustment knob
Hermetically sealed thermostat switch
Stainless steel sensing bulb
Ground wire connection
*UL, FM, CSA not available
Chromalox
®
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 888-996-9258 • FX: 615-793-3563 • www.chromalox.com
3
http://www.chromalox.com
Single Point On/Off Temperature Controls — DL
Enclosure Specifications for RTAS & RTBC
Max. Continuous
Max. Intermittent
Exposure Temperature Exposure Temperature
Switch Rating
PCN
(Volts/Amps)
°F
°C
°F
°C
Wt.
(Lbs.)
RTBC
389600
22A @ 120 - 480
400
200
500
260
2
RTBC-EP
389618
11A @ 120 - 250
400
200
500
260
2
RTAS
389589
22A @ 120 - 480
400
200
500
260
2
RTAS-EP
389579
11A @ 120 - 250
400
200
500
260
2
Model Number
Cable grommets provide a water-tight seal between base, box and cable. Use GRSR with all self-regulating cables. Use GRCW
with all constant wattage cables. One of each grommet is included in each kit. See table below to order spare grommets.
Spare Grommets
Model
Description
PCN
GRS
RTD/Capillary
385000
GRO
Blank
385019
GRSR
Self-Regulating Type
389714
GRCW
Constant Wattage Type
389722
Thermostat Specifications for All RTAS & RTBC
Temperature Set Point Range ....................... 0 to 400°F (-18 to 200°C) for RTBC Only;
0 to 225°F (-18 to 107°C) for RTAS
Microswitch® Rating ........................................ 22 Amps SPDT for RTAS and RTBC; 11 Amps at 250V for EP models
Scale Division ...................................................... 10°F (5.6°C)
Maximum Sensor Exposure Temp. ............. 450°F (230°C)
Sensor Dimensions ........................................... 1/4” OD x 7-1/4” L Bulb, 3’ Capillary - RTBC
9/16” OD x 4” L Stainless Steel Probe - RTAS
Operating Ambient Temp. Range ................ -40 to 160°F (-40 to 71°C)
Factory Preset and Calibrated ...................... 200°F (93°C) for RTBC
40°F for RTAS
PJ327
PDS DL CONTROLS
OCT 03
4
®
Chromalox
• 1382 Heil Quaker Blvd. • LaVergne, TN 37086 • PH: 888-996-9258 • FX: 615-793-3563 • www.chromalox.com
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