Cold Weather Catalog - Chromalox Precision Heat and Control

Heating CableDLIntegrated TemperatureControls (cont’d.)RTBC & RTBC-EP Bulb & CapillaryRTBC is a line-sensing thermostat whichis generally used for process temperaturemaintenance applications in ordinary (nonhazardous)areas. The thermostat is mountedwithin the enclosure and the capillary isbrought out through one of the openings inthe bottom of the box. This design providesextra protection for the capillary, especiallywhen the control is mounted on a pipe, forheat tracing applications. The three foot longstainless steel capillary provides good fl exibilityin mounting locations.FG6.25"(15.9 cm)A5.25"(13.3 cm)EBC4.25"(10.8 cm)DConstructionABCDEFStrategically placed cable entries allowmaximum fl exibility for insulation(Heating cable cut away for clarity).Stainless steel tiedown support providespositive attachment to pipes. 1Heavy duty support legs give stable pipemounting and provide conduit clearancefor applications with up to three inchesof insulation.Opening for 3/4" (20 mm) conduit hub. 1Oblique sided box and cover allow easyaccess for wiring.Stainless steel capillary (3 ft/1m long).ACCESSORIES& CONTROLSRTBC-EP is a modifi ed version of the RTBCwhich utilizes a hermetically sealed switch.Since this switch has no arcing contacts itcan be used in Division 2 Hazardous Areas.SpecificationsTemp. Setpoint Range — 0 to 400°F (-18 to200°C) for RTBC, RTBC-EPKMLNIGHStainless steel sensing bulb.Cable grommets provide water-tight sealbetween 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. Seetable below for spare grommets.Microswitch ® Rating — 22 Amps SPDT forRTBC; 11 Amps, RTBC-EPMinor Scale Division — 10°F (5.6°C)Max. Sensor Exposure Temp. — 450°F(230°C)Sensor Dimensions — 1/4" (6.4mm) OD x7-1/4" (18.4cm) L Bulb, 3' (1m) CapillaryOperating Ambient Temp. Range — -40°F to160°F (-40 to 71°C)Factory Preset and Calibrated — 200°F(93°C) for RTBC, RTBC-EPOHIJKLMNThree position terminal block for easywiring.Power wiring entry. Conduit hub notincluded. 1Gasket provides water-tight seal betweenbox and lid. It is affi xed to the lid andcaptures the mounting hardware.Thermostat mounting bracket.Setpoint adjustment knob.Thermostat switch.OStainless steel sensing bulb.Note 1 — Refer to DL & EL General ApplicationAccessories at the end of this section.Spare GrommetsPCNGRS RTD/Capillary type 385000GR0 Blank 385019GRSR Self-regulating cable type 389714GRCW Constant wattage cable type 389722Ordering Information — RTBCModelPCNSwitch Rating Max. Continuous Exposure Temp. Max. Max. Intermittent Exposure Temp. Temp.(Amps/Volts)°F °C °F °CWt.(Lbs.)RTBC 389600 22A @ 120 - 480 400 200 500 260 2RTBC-EP 389618 11A @ 120 - 250 400 200 500 260 2Stock Status: S = stock AS = assembly stock NS = non-stockTo Order—Specify model, PCN and quantity.145