Product Overview
Raytek is an active Fluke Process Instruments product-line brand — the Mi3 compact sensors, the GP and CM/CI OEM lines, and the Raynger 3i Plus portable are current. But the older Raytek workhorses are discontinued: the Marathon series (MM, MR, MA, and the FA/FR fiber units), the Thermalert XR / TX / SX spot sensors, the T3Plus monitor, the two-piece compact MI (RAYMI — MID / MIC / MIH), the original Raynger 3i, and the MP50 / ScanIR2 line scanners with the legacy TF100 / GS100 / ES100 / EC100 / CS100 imaging software. This reference maps that installed base to the current lines, and existing installations are still supported in the field. The miniature two-piece MI — a stainless sensing head on a cable plus a separate electronics box — maps cleanly to the current Mi3, which keeps the same head-plus-box modular architecture (single-color, matched LT optics and temperature range). Match by the old part number and the process data, and the successor — reusing the ThermoJacket, cable, and mount where it can — follows.
Key Features & Benefits
- The whole Marathon family has a current successor — MM, MR, MA, and the FA/FR fiber units each map to an Endurance variant, and the XR/TX/SX spot sensors to Thermalert 4.0 — so an aging Marathon line is a planned upgrade, not a scramble. Nothing in the Raytek install base is orphaned.
- The MR’s ratio measurement carries across intact — the two-color Marathon MR (and the FR fiber) was chosen to read through dust, scale, and an underfilled spot; its successor is an Endurance ratio sensor that does the same, at two wavelengths at once. Ratio in, ratio out — the behavior is preserved, not approximated.
- Reuse the ThermoJacket, cable, and mount — FPI publishes ThermoJacket housings for Endurance and Thermalert 4.0, Marathon cable / terminal-block compatibility, and adapter kits, so a current head often reuses the existing cooling jacket, cabling, and flange. The expensive install hardware usually stays.
- Scanner software migrates by application, not by guesswork — each legacy imaging package has a named MP-SYS successor — TF100→TF150 (thermoforming), GS100→GS150 (glass), ES100→ES150 / EC100→EC150 (web), CS100→CS400 (kiln) — so the process the old system ran is the process the new one runs. The application maps one-to-one.
Specifications
- Status
- Discontinued. The Raytek Marathon series (MM, MR, MA, FA/FR fiber), the Thermalert XR / TX / SX spot sensors, the T3Plus monitor, the two-piece compact MI (RAYMI — MID / MIC / MIH), the original Raynger 3i portable, and the MP50 / ScanIR2 line scanners are no longer manufactured. Installed units are still supported in the field with defined migration paths.
- Current successor families
- Endurance integrated (E1R/E2R ratio · E1M/E2M/E3M single-color) and Endurance Fiber Optic (EF1R/EF2R · EF1M/EF2M) for the Marathon install base; Thermalert 4.0 for the XR / TX / SX / T3Plus spot sensors; the Mi3 compact modular sensor for the two-piece MI; Raynger 3i Plus for the 3i portable; MP150 with MP-SYS software for the MP50 / ScanIR2 scanners; ThermoView TV30 for the legacy thermal imagers.
- Measurement principle
- Preserved on every path. The successor matches the legacy spectral response, temperature range, and optics — and the measurement principle: a single-color Marathon maps to a single-color successor; the two-color Marathon MR (and FR fiber) map to a two-color successor.
- How a successor is matched
- Matched from the Raytek nameplate and/or full part number (which encodes model, spectral response, temperature range, and optics) plus the current process data. The old part number is the most reliable starting point — e.g. an MM LTS vs an MR vs an MM 1M each take a different successor.
- 2-color (ratio) preservation
- Raytek’s ratio instruments — the Marathon MR and the FR fiber-optic ratio sensor — migrate only to a ratio successor: Endurance E1R/E2R (integrated) or EF1R/EF2R (fiber-optic). They are never routed to a single-color Marathon MM or Thermalert 4.0 successor.
- Legacy support scope
- Prater Technical Partners recommends the successor and the adapters that reuse existing hardware: FPI publishes ThermoJacket housings, Marathon cable / terminal-block compatibility, and M5-style patch kits so an Endurance or Thermalert 4.0 head can reuse the Marathon mount, cooling jacket, and often the cable. Factory calibration / repair routes through the Fluke service center.
- Software & configuration
- Legacy DataTemp Multidrop and the MP50 / ScanIR2 imaging packages (TF100 thermoforming, GS100 glass, ES100 / EC100 web, CS100 kiln) migrate to the current DataTemp and MP-SYS application software — GS150 (glass), GS150-LE (Low-E), EC150 (plastics web), ES150 (rolling mill / paper), TF150 (thermoforming) — with the CS100 kiln package succeeded by the CS400 rotating-kiln system on the MP150 platform.
- Spares, cable & calibration
- Marathon cables, terminal blocks, ThermoJacket housings, protective windows, sighting tubes, and the MTAK transportable kit were catalogued in the 2011 list and several remain available as spares or carry over to the successor; NIST/DAkkS-traceable calibration is offered on the current successor at order time.
Raytek legacy → current Fluke Process Instruments successor
| Legacy Raytek model | Type | Status | Current successor | Principle preserved |
|---|---|---|---|---|
| Marathon MM LT / MT / G5 (8–14 / 3.9 / 5 µm, 70:1) | 1-color spot | Discontinued | Endurance E2M/E3M or Thermalert 4.0 (by range & wavelength) | 1-color → 1-color |
| Marathon MM 1M / 2M / 3M (metals, 1 / 1.6 / 2.3 µm, 160–300:1) | 1-color spot | Discontinued | Endurance E1M / E2M / E3M (matched range) | 1-color → 1-color |
| Marathon MR (two-color, 1 µm, 44–130:1) | 2-color ratio | Discontinued | Endurance E1R / E2R | 2-color → 2-color (ratio) |
| Marathon MA (single-color 1M / 2M) | 1-color spot | Discontinued | Endurance E1M / E2M | 1-color → 1-color |
| Marathon FA1 / FA1G (fiber-optic, single-color 1 µm) | 1-color fiber | Discontinued | Endurance Fiber EF1M / EF2M | 1-color → 1-color |
| Marathon FR (fiber-optic, two-color) | 2-color ratio fiber | Discontinued | Endurance Fiber EF1R / EF2R | 2-color → 2-color (ratio) |
| Thermalert XR (LT / MT / G5 / P7, 30–50:1) | 1-color spot | Discontinued | Thermalert 4.0 (matched spectral range) | 1-color → 1-color |
| Thermalert TX (LT / MT / HT / G5 / P7, incl. IS) | 1-color spot | Discontinued | Thermalert 4.0 (IS option on the −6 interface) | 1-color → 1-color |
| Thermalert SX (LT / MT / HT / G5) | 1-color spot | Discontinued | Thermalert 4.0 | 1-color → 1-color |
| T3Plus (thin-film plastics, 3.43 µm) | 1-color spot | Discontinued | Thermalert 4.0 —P3 (plastics) range | 1-color → 1-color |
| Raytek MI (RAYMI — MID / MIC / MIH, two-piece compact, LT 8–14 µm, 10:1 / 22:1, −40 to 600°C) | 1-color compact | Discontinued | Mi3 compact modular — LT head, matched optics & range | 1-color → 1-color |
| Compact CM / CI (OEM threaded sensors) | 1-color OEM | Current — no migration needed | CM / CI remain current Raytek OEM sensors | 1-color → 1-color |
| Raynger 3i (portable handheld) | 1-color portable | Discontinued | Raynger 3i Plus (1M & 2M, dual-laser, 250:1) | 1-color → 1-color |
| MP50 / ScanIR2 (line scanner) | Line scanner | Discontinued | MP150 linescanner (direct-replacement enclosures available) | scanner → scanner |
| TF100 / GS100 / GS110 / ES100 / EC100 / SS100 (imaging software) | Scanner software | Discontinued | MP-SYS: TF150 / GS150 / GS150-LE / ES150 / EC150 | application preserved |
| CS100 (rotating kiln-shell monitoring) | Kiln scanner system | Discontinued | CS400 rotating-kiln system on the MP150HR platform | scanner → scanner |
| TIP450 / wallboard imaging | Imaging system | Discontinued | TIP900 (MP150-based) wallboard imaging — upgrade path published | scanner → scanner |
| ThermoView (legacy TV-series fixed imager) | Thermal imager | Discontinued | ThermoView TV30 (TV33 320×240 / TV36 640×480) | imager → imager |
Common Applications
- Primary metals & foundry — reheat furnaces, casting, forging, and induction lines running legacy Marathon MM / MR / MA brightness and ratio sensors
- Glass — secondary glass forming, bending, annealing, and tempering on legacy MM G5 sensors and GS100-software scanners
- Plastics & web — extrusion, coating, lamination, and thermoforming lines on T3Plus / XR plastics sensors and TF100 / EC100 / ES100 scanner software
- Cement & lime — rotary-kiln shell monitoring on legacy CS100 / MP50 / ScanIR2 systems
- Maintenance-driven replacement — one failed Marathon, XR, or TX at a time, matched to a current Endurance or Thermalert 4.0 successor that reuses the existing ThermoJacket and mount
This is a migration reference, not a product line. If your Raytek model is not in the table, or the table says “contact for application match,” send the nameplate / part number and the process data and we will identify the correct successor — preserving the measurement principle — rather than guess at a part number. For the Ircon installed base (Modline, Mirage, ScanIR II), see the Ircon legacy migration reference.
Design & Selection Considerations
- Separate the single-color Marathon from the ratio Marathon — the MM and MA are single-color; the MR is two-color (ratio); the letter in the part number is the tell. They take different successor families, and a ratio MR must land on Endurance E1R/E2R — never on a single-color MM successor. Confirm the Marathon flavor before you quote the replacement.
- Match the metals wavelength on the MM 1M / 2M / 3M — the high-temperature single-color Marathons read short wavelengths (1 / 1.6 / 2.3 µm) to cut emissivity error on hot metal; the Endurance 1M/2M/3M successor has to carry the same band and the same high D:S, or the metal reading drifts. Short-wavelength metals work is unforgiving of a wavelength mismatch.
- Carry the intrinsic-safety rating across on a TX install — the Thermalert TX offered an IS rating for classified areas; the Thermalert 4.0 carries IS on its −6 HART interface option, so the hazardous-area approval is preserved — but it has to be specified, not assumed. An IS legacy point stays an IS successor.
- Match the MI to the right Mi3 head — the discontinued two-piece MI shipped as a single LT (8–14 µm) sensor in 10:1 or 22:1 optics; the current Mi3 keeps the same head-plus-box architecture but is offered in LT, G5 (glass), and 1M / 2M (metals) heads. For a like-for-like MI replacement, specify the LT head and match the original optics and −40 to 600°C range — the wider Mi3 wavelengths are an upgrade option, not the default. Replace the MI on its own LT band unless the process has changed.
- Treat a fiber-optic Marathon as a fiber migration — the FA1 / FA1G / FR put the optical head in the hot zone on a fiber; the Endurance Fiber line is the like-for-like path (EF1M/EF2M single-color, EF1R/EF2R ratio) and the roof-mount / sight-tube hardware often carries over. A fiber install wants a fiber successor, matched on principle.
- Scope the scanner migration as a system — replacing an MP50 / ScanIR2 with an MP150 brings new software (DataTemp DP / MP-SYS), new I/O modules, and a new data link; FPI publishes direct-replacement enclosures, but the control-room side changes. Budget the software and I/O, not just the scanner head.
To match a discontinued Raytek sensor to its successor:
Use the input form to send us the legacy nameplate and, ideally, the full model / part number off the sensor (it encodes spectral response, temperature range, and optics). Add: the target material and its emissivity, the process temperature range, whether the instrument is single-color or 2-color (ratio), the current optics / distance-to-spot and working distance, the output and communications the control system expects, and any mounting, cooling, or fiber-optic hardware already in place that the replacement has to reuse. With that we confirm the correct current successor — preserving the measurement principle — and the adapters, cables, or mounting kits that let it drop into the existing installation.
IR Pyrometer Application Sheet ›Talk to an engineer directly — Scott Prater, Principal · 917-580-0878 · scott@pratertechnical.com
Specifications compiled by Prater Technical Partners from Fluke Process Instruments product datasheets.