Thermo-Trex 2800 RTD Cable 41250 Alternative — TEBAOFLEX Specification Review

Review the 41250 RTD signal route separately from heater and power cable

Thermo-Trex 2800 RTD 41250 is an original Amphenol TPC reference for an 18 AWG, three-conductor instrument cable. The manufacturer specifies a triplet for resistance-temperature-detector control and a mica/glass construction for severe heat. A buyer looking for an alternative needs the actual temperature along the cable, conductor-count and color-code requirements, shield/earth termination, bend duty and cable-entry fit. This TEBAOFLEX page collects the original-model facts for an engineering enquiry; it does not state that an untested TEBAOFLEX cable has the original 530°C or 600 V ratings.

The Specifications tab uses the original manufacturer’s published product page and datasheet as reference sources. The 530°C figure is the maximum conductor temperature in that reference; the allowable temperature of the sensor termination, conduit, gland or moving section can be lower. The manufacturer’s parallel Thermo-Trex 2800 power/control range is a different product and its sizes should not be imported into this RTD enquiry.

• Identify the RTD circuit: confirm three-wire sensor wiring, red/red/white assignment and instrument input.
• Map the route: distinguish a static hot zone from any flexing or cold-entry transition.
• Define the screen: specify how the braid and drain wire are bonded.
• Require a matched drawing: the finished OD, braid, wall and thermal tests must belong to the offered TEBAOFLEX construction.

For unshielded high-temperature leads rather than a three-core RTD signal cable, compare the MGT mica-glass lead wire.

Construction

Amphenol TPC's original 41250 reference describes three nickel-plated copper conductors in a triplet with a red/red/white code. The cores use mica tape and glass-fiber insulation; a nickel-plated copper braid with a flat drain wire and tape wrap surrounds the cable. The outer surface is a woven glass-fiber braid impregnated with a high-temperature finish. This layered, textile-covered construction differs materially from a fluoropolymer-jacketed RTD cable. A TEBAOFLEX design must be checked against its own cross-section and materials before these details become product commitments.

Applications

The original Thermo-Trex 2800 RTD reference is for high-temperature resistance-temperature-detector control and instrumentation, particularly where a three-conductor signal lead must cross a severe thermal route. Identify the thermal profile of each segment: a hot stationary section, transition through a gland, and any section expected to move can have different limits. A nominal maximum conductor temperature is not the rated temperature of every connected component.

• Use a three-wire RTD circuit only where the probe and input instrument are wired for that configuration.
• Specify the hot-zone distance, continuous versus intermittent exposure and any flame, chemical or abrasion exposure separately.
• Check the shield and drain termination against the instrument manufacturer's guidance.
• Keep the reference bend radius and cable entry dimensions in the design review; glass-braid surfaces need appropriate handling and protection.

Specifications

The following is original Amphenol TPC part 41250 reference data taken from its current public product page and PDF; the local directory provides imagery only. It supports a precise RFQ target but is not a TEBAOFLEX test sheet.

Original-family rating and geometry data

Standards

The original manufacturer's public 41250 data states a 600 V nominal rating and maximum conductor temperature of 530°C. Those ratings are a comparison target. A TEBAOFLEX quotation should identify the electrical test method, material and thermal validation for the actual offered cable, together with any project-specific documentation.