Models 302 & 303 (Legacy)
Spring-Loaded RTDs for General Purpose housings

Designed for applications where a Weed Instrument General Purpose Head and a thermowell are
required. The spring-loaded action of this RTD ensures proper contact with the tip of the thermowell for
maximum heat transfer.

	Model 302 is a Spring-Loaded temperature sensor intended to be used in a thermowell. • Refer to Model 301 for explosion proof connection head applications. • Refer to Model 305 if spring-loaded hex fitting is required.
	Model 303 is a Spring-Loaded, Tip Sensitive temperature sensor. The tip sensitive design is ideal for bearing temperature applications. • Refer to Model 304 for cast iron explosion-proof connection head applications. • Refer to Model 102 if spring-loading is not required.

Specifications:

1. Base Model	Base Model/Series Number.
2. A. Accuracy: B. TCR: C. Ice Point Resistance: D. Response Time: E. Tip Sensitivity:	Standard Class B (no code) High Class A (code H) Special Customer Specified (code S) * Industry Standard is DIN Curve (code 01B), Platinum, 100@ 0°C. Conforms to IEC 751. Temperature Coefficient of Resistance is the temperature vs. resistance characteristics of a given metal (Pt, Cu & Ni) used in manufacturing the RTD. Determines the curve of the RTD. Ro - Resistance at 0°C (32°F) Dependent on sheath diameter, the smaller diameter - faster response. See RTD General Specs. Model 303 Copper Tip, element is encapsulated in copper to increase sensitivity at tip of probe.
3. Construction: wire.	Code A - 316SS tube and wire construction, thin film element (.00385055) TCR, teflon insulated lead Code C - 316SS tube and wire construction, wire wound element, fiberglass insulated lead wire.
4. Lead Wires:
5. Sheath Diameter:	.250” (1/4”) is the industry standard.
6. Sheath Length:	Entire stem length. See sizing chart in RTD General Specifications.
7. Lead Wire Length:	Length of wires beyond sheath.
8. Water resistant:	Increases moisture protection for humid environments.