Semiconductor Pyrometer Buying Guide: Used RTP and CVD Temperature Sensors

This guide is for: process engineers sourcing replacement pyrometers for RTP, CVD, and epitaxy tools — and trying to decide if the used unit needs recalibration before it goes in the tool.

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You’ve seen it happen. A rapid thermal processing (RTP) run hits 1150°C, and the pyrometer’s readout drifts by 15°C. No one notices until the wafer stack starts warping mid-cycle. By the time the tool logs the error, you’ve just lost a batch of 200mm wafers. That’s $15K–30K down the drain. Not because the process broke. Because the pyrometer lied.

This is why I never sell a used pyrometer without a documented calibration history. You don’t get second chances with temperature sensors. Let’s fix that.

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What a Bad Temperature Read Actually Costs

A 5°C drift might seem trivial. But in CVD or epitaxy, that’s the difference between uniform film deposition and particulate nucleation. Recipe parameters drift, yield plummets, and you’re back in the lab recalibrating the tool. Labor alone for a full RTP system recal? $2K–4K. Multiply that by four cycles a week, and a bad pyrometer isn’t a “cost of doing business” — it’s a financial hemorrhage.

Used pyrometers are a fix, not a gamble. But you need to know what you’re buying.

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Pyrometer Types: Which Process Uses Which

RTP demands speed. You need a sensor that snapshots wafer temps in milliseconds. Mattson’s RTP pyrometers (models like the 1200 series) are built for that — but they’re also finicky about line-of-sight. Any window coating during a nitride deposition? Game over.

CVD tools (especially LPCVD) need pyrometers resistant to volatile byproducts. MKS AccuTrac units are common here — their ceramic windows hold up longer against chlorine-based etch residues.

Epitaxy is the outlier. The growth window is narrow (±3°C). You’ll often see Raytek Marathon models here — they’re rugged, but their fiber optics degrade without proper storage.

Your process defines your sensor. Don’t swap an RTP pyrometer into an epitaxy tool just because it “looks similar.” It won’t last a month.

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Mattson vs MKS vs AMAT vs Raytek: What Each Is Worth Used

Let’s talk numbers. New pyrometers range from $5K to $25K. Used? $800 to $4K — but only if you know what to de-scope.

• Mattson RTP pyrometers: The 1200 and 1400 series are gold standards for RTP. Used, they fetch $1.2K–$3.5K. But check the last calibration date. If it’s older than 18 months, add $500 for a re-cert.
• MKS AccuTrac: Common in CVD systems. Used models sell for $800–$2.2K. The ceramic window is key — if it’s cracked or coated, subtract 40% from the asking price.
• AMAT 0100-series: These are in high demand. A used 0100-0010-00 with a valid calibration? $3K. Without? $2.4K — but you’re buying risk.
• Raytek Marathon: Durable, but the fiber optic cables are a liability. Used units go for $1.1K–$1.8K. Ask for proof of recent fiber integrity tests.

Compare these models side-by-side in our RTP Equipment Guide.

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Calibration: When to Trust the Used Unit vs. Recal First

Here’s the rule: If the pyrometer hasn’t been recalibrated in over a year, or if it’s from a decommissioned tool, you recalibrate. Period.

Why? Drift is silent. I’ve tested used pyrometers that read perfect at 25°C but were off by 8°C at 1000°C. Labs use blackbody calibrators for traceable NIST standards — ask for proof of that.

But don’t overpay for calibration. If a seller includes a valid, recent calibration certificate (within 12 months), trust it. If they handwave, add $200–$400 to the price for your own verification.

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Common Failure Modes and What to Check at Incoming

1. Window contamination: Look for a milky haze or pinhole etching. Even a thin layer of silicon residue changes emissivity.
2. Drift without alarm: Ask for the sensor’s “drift history.” I’ve bought units that drifted 10°C over six months without triggering an error flag.
3. Fiber optic damage: Shine a phone light through the cable. If it’s dim or broken, toss it. Replacing the fiber costs more than buying a new unit.

Incoming checks should take 15 minutes: test the line of sight, verify the output signal, and confirm the calibration date. Skip this step, and you’re writing a check to the scrap bin.

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What to Actually Order and What Certifications to Ask For

Order the sensor with these three items:

• NIST-traceable calibration certificate (within 12 months).
• Window condition report (photos of the emitter and receiver lenses).
• Fiber optic integrity test (if applicable).

No? Walk. A used pyrometer without these is a lottery ticket — and process engineers don’t have time for luck.

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FAQ: Answers You Actually Need

"semiconductor pyrometer used price"
Depends on brand and calibration. Mattson RTP units: $1.2K–$3.5K. MKS AccuTrac: $800–$2.2K. Raytek Marathon: $1.1K–$1.8K.

"how to calibrate RTP pyrometer"
Use a blackbody calibrator at 800°C, 1000°C, and 1200°C. Log the deviation. If it’s >±3°C at any point, the sensor is done.

"pyrometer vs thermocouple semiconductor process"
Pyrometers are non-contact and faster. Thermocouples are used in furnaces but lag in RTP. Don’t mix them in the same tool.

"Mattson RTP pyrometer for sale"
Check brokers with documented calibration histories. We have a 1200 series unit in stock.

"pyrometer window contamination symptoms"
Gradual drift in readings, inconsistent emissivity errors, visible haze on the lens.

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Related reading: RTP Equipment Buying Guide | Furnace Equipment: Horizontal vs Vertical LPCVD