TH-22

Supported Applications

The Omega TH-22 series comprises thermistor immersion probes designed for high-temperature applications up to 200°C (392°F). These probes utilize 55,000 Series glass encapsulated thermistor elements to provide excellent stability and accuracy. The integral M12 connector design features an LCP insert with nickel-plated copper pins specifically engineered for elevated temperature service.

Operating Conditions & Performance

The TH-22 series operates within a process temperature range of -80 to 200°C (-112 to 392°F) continuous, with intermittent capability up to 250°C (482°F). The measurement range is specified as -50 to 200°C (-58 to 392°F), offering an accuracy of ±0.2°C from 0 to 70°C (32 to 158°F).

Response time in water flowing at 0.91 m/s is approximately 7 seconds for 50% response, 8 seconds for 63.2%, and 14 seconds for 90%. The probes feature an IP67 enclosure rating when the mating connector is installed.

Configuration Options

The series supports multiple thermistor resistances at 25°C (77°F), including 2,252 Ω, 3K Ω, 5K Ω, and 10K Ω. Steinhart-Hart constants for each resistance value are provided to determine resistance at specific temperatures.

Configuration options include:

• Diameters: Standard offerings include ¼" (6 mm) probes; ½" probe diameters are available by modifying the model number suffix from "-1/4" to "-1/8".
• Lengths: The standard overall length is 6" (150 mm), but custom lengths can be ordered. A minimum immersion depth of 1.5" is recommended to avoid stem conduction errors.
• Dual Element Versions: Available by adding "-DUAL" to the model number, though not offered in ¼" or 3 mm diameter probes.
• Process Connections: Options include 1/2-14 NPT, 3/8-18 NPT, 1/4-18 NPT, M8x1 Thread, M10x1 Thread, G1/2 BSPP, and G1/4 BSPP.
• Accessories: Optional extension cables (M12CM-T24SSPC-SF-2, M12CM-T24SSPC-RF-2) are sold separately.

The wetted materials consist of a 316L stainless steel sheath and housing. Approvals include RoHS compliance, with NIST certification available as an option.

Key Product Differences

Model numbers follow the format TH-22X-<RESISTANCE>-<DIAMETER>-<LENGTH>-M12. The letter suffix (A, B, C, D, E, F, G, H) denotes specific mounting configurations:

• TH-22A: Straight sheath without integral process connection.
• TH-22B through TH-22D: Straight sheaths with ½ NPT, ⅜ NPT, and ¼ NPT mounting threads respectively.
• TH-22E through TH-22H: Metric straight sheath versions featuring M8x1, M10x1, G½ BSPP, and G¼ BSPP mounting threads.

To specify a custom length other than 6", the "-0600" segment in the model number is replaced with the required length code (e.g., 9" = 0900, 4½" = 0450).