Chromalox Big Red Book

Controls

B100 & E100 Heat Trace/Freeze Protection Thermostats (cont’d.)

Dimensions

E100 Heat Trace, NEMA 4X Line and Pipe Sensing

B100 Freeze Protection, NEMA 4X Ambient Sensing

2.34 (59)

4 (101)

2.34 (59)

4 (101)

4.21 (107)

4.21 (107)

8.75 (222)

8.75 (222)

1/2” NPT Female Electrical Con- nection

1/2” NPT Female Electrical Con- nection

Side View

Front View

Side View

Front View

All Dimensions in Inches (mm)

E121/122 Heat Trace, NEMA 7 and 9 Line and Pipe Sensing

B121 Freeze Protection, NEMA 7 and 9 Ambient Sensing

5.25 (133)

5 (127)

5.25 (133)

5 (127)

9.66 (245)

9.66 (245)

Front View

3/4” NPT Female Electrical Con- nection

3/4” NPT Female Electrical Con- nection

Side View

Front View

Side View

Ordering Information

Enclosure

Thermostat Type

Model

Switch Output

NEMA Stock PCN

Heat Trace, Remote E100 Bulb and Capillary E121

305322 384112

Single Output Single Output

4X

S S

4X,7,9

25 - 325˚F (-5 to +163˚C)

E122 Dual Output, Dual Setpoint E122P Dual Output, Common Setpoint 4X,7,9 NS 305357 4X,7,9 NS 305349

B100 B121

305365 384104

Freeze Protection Direct Mount 15 - 140˚F (-10 to +60˚C)

Single Output Single Output

4X

S S

4X,7,9

H-190