Chromalox DL Catalog Page
Heating Cable
DL
Integrated Temperature
Controls (cont’d.)
RTBC & RTBC-EP Bulb & Capillary
RTBC is a line-sensing thermostat which
is generally used for process temperature
maintenance applications in ordinary (nonhazardous) 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.
RTBC-EP is a modified version of the RTBC
which utilizes a hermetically sealed switch.
Since this switch has no arcing contacts it
can be used in Division 2 Hazardous Areas.
Specifications
Temp. Setpoint Range — 0 to 400°F (-18 to
200°C) for RTBC, RTBC-EP
®
Microswitch
RTBC; 11 Amps, RTBC-EP
Minor Scale Division — 10°F (5.6°C)
Max. Sensor Exposure Temp. — 450°F
(230°C)
Sensor Dimensions — 1/4" (6.4mm) OD x
7-1/4" (18.4cm) L Bulb, 3' (1m) Capillary
Operating Ambient Temp. Range — -40°F to
160°F (-40 to 71°C)
Factory Preset and Calibrated — 200°F
(93°C) for RTBC, RTBC-EP
Rating — 22 Amps SPDT for
4.25"
5.25"
(13.3 cm)
(10.8 cm)
E
D
F
6.25"
(15.9 cm)
C
G
A
B
M
K
L
H
O
Construction
Strategically placed cable entries allow
A
maximum flexibility for insulation
(Heating cable cut away for clarity).
Stainless steel tiedown support provides
B
positive attachment to pipes.1
C
Heavy duty support legs give stable pipe
mounting and provide conduit clearance
for applications with up to three inches
of insulation.
Opening for 3/4" (20 mm) conduit hub.
D
E
Oblique sided box and cover allow easy
access for wiring.
F
Stainless steel capillary (3 ft/1m long).
G
Stainless steel sensing bulb.
H
Cable grommets provide water-tight seal
N
between base, box, cable and capillary.
Use GRSR with all self-regulating cables.
Use GRCW with constant wattage cables.
One of each grommet included in kit. See
I
table below for spare grommets.
I
Three position terminal block for easy
wiring.
J
Power wiring entry. Conduit hub not
included.
K
Gasket provides water-tight seal between
box and lid. It is affixed to the lid and
captures the mounting hardware.
L
Thermostat mounting bracket.
M
Setpoint adjustment knob.
N
Thermostat switch.
O
Stainless steel sensing bulb.
1
1
Note 1 — Refer to DL & EL General Applica-
tion Accessories at the end of this section.
Spare Grommets PCN
GRS RTD/Capillary type 385000
GR0 Blank 385019
GRSR Self-regulating cable type 389714
GRCW Constant wattage cable type 389722
Ordering Information — RTBC
Model PCN
RTBC 389600 22A @ 120 - 480 400 200 500 260 2
RTBC-EP 389618 11A @ 120 - 250 400 200 500 260 2
Stock Status: S = stock NS = non-stock
To Order—Specify model, PCN and quantity.
Switch Rating
(Amps/Volts)
Max. Continuous Exposure Temp. Max. Intermittent Exposure Temp.
Max. Continuous Exposure Temp.
°F °C °F °C
Max. Intermittent Exposure Temp.
Wt.
(Lbs.)
G-119
ACCESSORIES
AND CONTROLS
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