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Series-BTO
Bimetal Thermometer w/ Transmitter Output for Boilers & Compressors
- Thermometer and transmitter in one device
- Weatherproof construction
Series-BTO
From
TWD
94,902
Product Overview
- Accuracy ± 1 %
- Applications Boilers, Industrial and Manufacturing, Oil
- Current Output 4 to 20 mA
- Electrical Connection 3/4 in NPT female Conduit with Screw Terminal block
- Enclosure Ratings IP66, NEMA Type 4X
- Loop Resistance 1045 Ω
- Materials 304 SS, Lens:Glass
- Materials, Wetted 304 Stainless Steel
- Measurement Type Temperature
- Operating Temperature, Max 185 °F
- Operating Temperature, Min -58 °F
- Output Signal Current
- Power Consumption 38 mA
- Process Connection Size 1/2 in
- Process Connection Type NPT Male
- Series ID Series-BTO
- Supply Power Type DC
- Supply Voltage 10 to 33 Vdc
- Weight 884.5 g
Supported Applications
The Dwyer Series BTO is a bimetal thermometer with transmitter output designed to combine local temperature indication and remote signal transmission in one device. The series features weatherproof construction suitable for applications including boilers, compressors, and thermal oxidizers.
Operating Conditions & Performance
The Series BTO operates within an ambient temperature range of -58 to 185°F (-50 to 85°C). Measurement accuracy is specified as ±1% F.S. Resolution is listed as 2°F, with a resolution of 5°F for models covering the 400°F and 550°F ranges. The device requires a power supply of 10-33 VDC and provides an output signal of 4-20 mA.
Electrical specifications include a loop resistance of 1045 Ω and a power consumption of 38 mA. The enclosure is rated NEMA 4X (IP66). Wetted materials are constructed from 304 SS, with the housing also made of 304 SS.
Configuration Options
The series offers configurable dimensions and ranges to accommodate specific installation needs. Available dial sizes include Ø3-1/4 [Ø82.55] (3") or Ø5-1/4 [Ø133.35] (5"). Stem lengths vary, with documented options including 2.5", 4", 6", 9", and 12".
Standard measurement ranges include:
- 0 to 250°F
- 50 to 550°F
A note in the documentation indicates that additional temperature ranges are available upon contacting the factory, including -40 to 160°F, 0 to 200°F, 50 to 300°F, and 50 to 400°F.
Connections
- Process Connection: 1/2" NPT
- Electrical Connection: 3/4 NPT conduit connection
Key Product Differences
The Series BTO model numbering reflects the specific configuration of dial size, stem length, and temperature range. For example, models such as BTO32551 denote a 3" dial with a 2.5" stem for the 0 to 250°F range, while corresponding 5" dial variants (e.g., BTO52551) maintain the same stem length and range.
Physical dimensions vary by configuration: overall height is listed as 7-1/8 [180.98], with a conduit connection diameter of Ø3-1/16 [Ø77.79] and length of 2-15/16 [71.61]. The stem diameter is specified as Ø1/4 [Ø6.35]. Weight for the device is documented at 1.95 lb.
PDFs & Manuals
