Series-S2-4

Supported Applications

The Dwyer Series S2-4 Weatherproof Surface Temperature Assembly is designed for monitoring the temperature of distribution lines when it is not possible to penetrate the pipe. The assembly utilizes a strap-on connection that wraps around pipes ranging from 2 to 5" in diameter, allowing secure tightening with a flat head screw driver.

Operating Conditions & Performance

The series operates within a process temperature range of -32 to 240°F (-35.5 to 115.5°C). Accuracy specifications vary by sensor type:

• Platinum RTD: ±0.6% @ 32°F (0°C)
• Nickel RTD: ±0.5°F @ 32°F (0°C)
• Balco RTD: ±0.1% @ 32°F (0°C)
• Thermistors: ±0.36°F from 32 to 158°F (0 to 70°C)

The housing features a NEMA 4X (IP66) enclosure rating and includes four ø0.896" [22.76 MM] 1/2" NPT conduit knockouts for flexible wiring entry.

Configuration Options

The Series S2-4 is available with a choice of 11 output options to communicate with standard building control systems. The model number format follows the pattern S2-<XX>, where <XX> denotes the specific sensor type.

• RTD Sensors:
• S2-41: Pt 100 Ω RTD
• S2-42: PT 1000 Ω RTD
• S2-43: Ni 1000 Ω RTD
• S2-44: Balco 1000 Ω RTD
• Thermistor Sensors:
• S2-45: 10K Ω Type II Thermistor
• S2-46: 3K Ω Thermistor
• S2-47: 5K Ω Thermistor
• S2-48: 100K Ω Thermistor
• S2-49: 20K Ω Thermistor
• S2-4A: 2252 Ω Thermistor
• S2-4B: 10K Ω Type III Thermistor

Physical dimensions include an overall diameter of 3-31/32 [101.00] and a height of 2-7/32 [56.15]. The pipe fit diameter is specified as 3-1/4 [82.39].

Key Product Differences

Variation within the series is defined by the sensor element selected, which determines both the model number and the electrical output characteristics (resistance values). The housing design remains consistent across all variants, featuring a twist-off cover to reduce installation time. All models share the same strap-on mounting mechanism suitable for 2 to 5" pipe sizes.