Description Reviews Description Flexible averaging duct sensor with a 100K ohm NTC sensing element. This unit has a 3-foot (91 cm) probe. View AllClose
Add to Cart Siemens 540-680FB Siemens MSRP: Now: $517.64 Was: TEC RM SNSR-W/STPT,IND,OVRD,WH 540-680FB
Add to Cart Siemens 540-680CA Siemens MSRP: Now: $517.64 Was: TEC Rm Snsr-w/Stpt,Ind,Ovrd Bg 540-680CA
Add to Cart Siemens 540-538 Siemens MSRP: Now: $31.55 Was: Metal guard for plasatic flush mount sensors. Includes two mounting screws. 540-538
Add to Cart Siemens 540-739 Siemens MSRP: Now: $84.09 Was: 10K Ohm Duct Temperature Sensor, with 18-in Probe 540-739