ON-409-ON-909

Supported Applications

The Omega ON-409 and ON-909 series are precision thermistor sensors designed for surface temperature measurements. These glue-on sensors feature a coin-style stainless steel housing engineered to maximize contact with the target surface. Documented applications include determining heat loss, evaluating compressor efficiency, and measuring manifold or bearing temperatures.

Operating Conditions & Performance

The series utilizes epoxy-encapsulated thermistors housed in stamped 300 Series stainless steel. The maximum operating temperature is rated at 100°C (212°F). Interchangeability specifications vary by model: the ON-409-PP offers ±0.1°C interchangeability from 0 to 70°C, while standard ON-909 models provide ±0.2°C over the same range. For applications requiring tighter tolerance, optional thermistors (part numbers 44030 through 44034) are available with a maximum working temperature of 75°C (165°F) and an interchangeability of ±0.1°C from 0 to 70°C.

Storage and operating conditions for best stability range from -80 to 75°C (-110 to 165°F). The sensor tip diameter varies between 0.38" and 0.44", depending on the specific model configuration.

Configuration Options

The series supports multiple resistance values at 25°C, including 2252 Ω, 3000 Ω, 5000 Ω, 10,000 Ω, and 30,000 Ω. Electrical connections are provided via a 26 AWG stranded PFA insulated and jacketed cable.

Configuration options include:

• Cable Lengths: Standard lengths of 3 m (10') for the ON-409 series or 300 mm (12") for standard ON-909 models. A 1 m (40") option is available by adding "-40" to the model number.
• Connectors: Models are supplied with stripped cable ends; a phone plug connector is available as an add-on option denoted by the suffix "-PP".
• Custom Lengths: Additional cable lengths can be specified in inches by appending the required length to the model number for additional cost.

Key Product Differences

The ON-409 and ON-909 series differ primarily in tip diameter, standard cable length, and connector type. The ON-409-PP features a 0.44" tip diameter with a 3 m (10') phone plug connection. Standard ON-909 models feature a smaller 0.38" tip diameter with stripped ends.

Resistance values define the specific model suffixes: -44004 corresponds to 2252 Ω, -44005 to 3000 Ω, -44007 to 5000 Ω, -44006 to 10,000 Ω, and -44008 to 30,000 Ω. Models utilizing the optional thermistor series (e.g., ON-909-44032) provide ±0.1°C interchangeability but are limited to a maximum working temperature of 75°C (165°F), compared to the standard 100°C (212°F).