Temperature Sensors for Grain Storage
HB21 Bearing Sensors
Maxi-Tronic has the industry leading controls, sensors, service and experience to provide complete hazard monitoring and control systems for your facility. Maxi-Tronic belt misalignment sensors are ideal for bucket elevators, belt conveyors, rotary drums, food processing and other material handling equipment.
HB21 FP21
Maxi-Tronic “Hot Bearing” HB21 Sensors in Action
- Easy-to-adjust length for any size bearing.
- HB21 Series Bearing Sensors allow greasing the bearing without removing the sensor. Full, non restricted, grease flow path.
- Easy to install and maintenance free. Just screw the “Housing” into an existing grease fitting location and slide in an “Insert”.
- Sensing element is located at the bearing race for the most rapid and accurate readings. Brass-tipped for improved thermal conductivity.
- Engineered for longevity and reliability.
- Best feature set in the industry.
HB21 Details
HB21 Models:
HB21 adjustable “Housings” are available for 1/8″NPT , 1/4″ NPT and metric grease fittings.
HB21 “Inserts”come in 3″, 4″ and 6” lengths and are available in these industry-standard sensor types:
- Thermocouple*: Type T standard, others available.
- RTD*: Industry standard PT100. 2 and 3-wire options.
- PTC Thermistor*: “HBRB” and MaxiScan compatible.
- DigiMax™ Digital*: “1-Wire” digital for DigiMax, PLC, MaxiScan 12/12M Controllers, MaxiTrack PC software and other makes of “1-Wire” digital controllers.
*Sensors certified for Class II Div. 1
HB21 Specs:
- Stainless steel construction.
- For existing 1/8”, 1/4” or metric Zerk fittings.
- Integrated 1/2″ NPT conduit fitting.
- Available with integrated armor cable and cord-grips for non-conduit installations.
HB21 Sensors are fully compatible with these Maxi-Tronic Controls:
- MaxiScan 12 and 12M: 12 inputs with independent set-point and output relays.
- Model 12M includes a motion controller.
- MTDT24: 24 input scanner for switch and thermocouple sensors. 2 output relays.
- PLC: Easily connects to PLCs.


FlatPack 21 Sensors
Maxi-Tronic has the industry leading controls, sensors, service and experience to provide complete hazard monitoring and control systems for your facility. Maxi-Tronic belt misalignment sensors are ideal for bucket elevators, belt conveyors, rotary drums, food processing and other material handling equipment.
FlatPack 21 in Action:
- Lug-style sensor is easy to bolt-on or strap-on to most surfaces.
- FlatPack temperature sensors are sensitive, fast-acting, reliable and maintenance free.
- Available in most industry-standard sensor types and with many cabling options.
- Engineered for longevity and reliability.
- Best feature set in the industry.
FlatPack 21 Models:
- FlatPack 21s are available in 2 basic models. The smaller low-voltage model is for thermocouple, RTD, PTC and 1-Wire Digital sensors. The larger model is for high-voltage temperature switch sensors:
- Thermocouple*: Type T is standard, others available.
- RTD*: Industry standard PT100. 2 and 3-wire options.
- PTC Thermistor*: “HBRB8/16” and MaxiScan 12/12M compatible.
- DigiMax™ Digital*: “1-Wire” digital for DigiMax, PLC, MaxiScan 12/12M Controllers, MaxiTrack PC software and other makes of “1-Wire” digital controllers.
- Temperature Switch: 120VAC 1A rated contacts, N/O or N/C, 105°F to 265°F set-points available. UL Rated Cable: PLTC-ER (Exposed Run), CMG.
- Sensors certified for Class II Div. 1
FlatPack 21 Specs:
- “21” Class II, Div.1 CSA
- Integrated 1/2″ NPT conduit fitting.
- Cord-grip available for non-conduit installations.
- Low voltage models are available with cordgrips and integrated armor cable.
FlatPack 21 Sensors are fully compatible with these Maxi-Tronic Controls:
- MaxiScan 12 and 12M: 12 inputs with independent set-point and output relays.
- Model 12M includes a motion controller.
- MTDT24: 24 input scanner for switch and thermocouple sensors. 2 output relays.
- HB/RB: 8 or 16 switch or PTC Thermistor inputs w/status indicators and 1 output relay.
- PLC: Easily connection to PLCs.

