Why AMETEK’s Jofra RTC-159B dry-block calibrator is built for tough field work

Reviewed: ad hoc news B2B & Pro desk. Edited and checked on 2026-06-20, 13:53. Details in the imprint.

The Jofra RTC-159B from AMETEK is one of those tools that rarely make headlines, yet decide whether a production line runs smoothly or throws up errors all day. You wheel the compact dry-block calibrator next to a reactor, plug in the sensor, and the block climbs with quiet determination to hundreds of degrees. No drama, just stable temperature and clear numbers on a bright display.

What the RTC-159B is made for

The Jofra RTC-159B is a portable reference dry-block calibrator designed for high-accuracy temperature calibration in the field and in laboratories. AMETEK positions it for demanding process industries such as oil and gas, chemical plants, and power generation, where reliable temperature loops are non-negotiable. Official RTC-150 series product information

Unlike liquid baths, the device uses a solid metal block with interchangeable inserts to clamp probes tightly. That means no sloshing fluids, less mess, and far easier transport between units in a plant. The housing feels deliberately robust, more like a compact tool trolley than a lab diva.

Temperature range, speed, and stability

In the RTC-150 family, the RTC-159B variant targets a wide temperature span roughly from well below ambient to several hundred degrees Celsius, depending on configuration, to cover common thermocouples and RTDs in industrial service. Jofra RTC series overview

What operators feel in practice is speed and repeatability. The block heats and cools quickly to target setpoints and then quietly holds them with tight stability, so technicians spend less time waiting for stabilization and more time actually checking transmitters and sensors.

Handling on a noisy plant floor

On a steel grating next to a hot column, small design decisions suddenly matter. The RTC-159B’s angled front panel keeps the color display readable even when you stand slightly above it, and the keypad is big enough for gloved hands.

The integrated handle and relatively compact footprint mean the calibrator fits on a small service cart, rather than demanding a dedicated bench. At several kilograms it is no featherweight, but field technicians generally accept that compromise for a solid block with good thermal mass.

Accuracy, reference sensors, and documentation

AMETEK specifies the RTC series with high accuracy and stability figures when used together with an external reference sensor and the device’s built-in reference channel, targeting metrology-grade performance for on-site work. AMETEK temperature reference documentation

In practical terms, that means a power plant calibration engineer can rely on the calibrator to stay well within typical process tolerances, even for critical safety loops. Automatic step programs and documentation functions reduce manual note-taking and help create traceable calibration records.

Where it shines and where it annoys

The big strengths are clear: broad temperature range, serious accuracy potential, and a construction that can survive being rolled through rough plant corridors. The device feels like a long-term investment, not a consumable.

There are trade-offs. A dry-block with this performance is not cheap, and adding external reference probes plus software can push total system cost further up. Warm-up and cool-down, while fast for the class, still require patience when technicians jump between extreme setpoints in a tight schedule.

How it fits into AMETEK’s portfolio and stock

Jofra-branded calibrators like the RTC-159B sit inside AMETEK’s Electronic Instruments Group, alongside pressure, vibration, and power quality instrumentation, giving the company deep roots in maintenance-heavy industries. That makes this seemingly niche box part of a much larger recurring calibration and service ecosystem.

Shares of AMETEK Inc. (US0311001004) trade on the NYSE in US dollars.

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