Fluke Calibration 1551A/1552A Stik Thermometer

Fits field and lab reference temperature checks where you need a handheld intrinsically safe Stik thermometer at ±0.05 °C over the full probe range (1551A Ex −50…160 °C thin-film RTD; 1552A Ex −80…300 °C wire-wound PRT).

Key advantages

• ±0.05 °C full-range accuracy — 1-year published reference accuracy on both Stik models.
• Two probe bands — 1551A Ex −50…160 °C thin-film RTD; 1552A Ex −80…300 °C wire-wound PRT.
• Intrinsically safe — Ex ib IIB T4 Gb (ATEX/IECEx) for classified area checks.
• Long battery life — ~300 h continuous (backlight off) on 3×AAA; optional 10,000-point logging.

Typical applications

• Field reference checks replacing mercury thermometers.
• Intrinsically safe plant rounds needing ±0.05 °C class accuracy.
• Lab and shop reference work with optional datalogging.

Selection guide

• Models — 1551A Ex: −50 to 160 °C, 100 Ω thin-film RTD; 1552A Ex: −80 to 300 °C, 100 Ω wire-wound PRT.
• Accuracy — ±0.05 °C (±0.09 °F) over full range (1 year).
• Resolution — Selectable 0.1 / 0.01 / 0.001 °C (default 0.01).
• Probe hysteresis — ±0.01 °C; response ~20 s typical (probe diameter dependent).
• Display units — °C or °F.
• Operating temperature (readout) — −10 to 50 °C (14 to 122 °F).
• IP / enclosure — IP50 enclosure rating (brochure).
• Battery — Approximately 300 hours continuous (backlight off); 3×AAA.
• Data logging — Optional up to 10,000 time-stamped readings.
• Hazardous area — Ex ib IIB T4 Gb (ATEX/IECEx); intrinsically safe.

Common mistakes

• Ordering 1551A when the process span goes below −50 °C or above 160 °C — use 1552A Ex (−80…300 °C) for the wider class.
• Treating default 0.01 °C resolution as the only option — resolution is selectable 0.1 / 0.01 / 0.001 °C.
• Ignoring Ex ib IIB T4 Gb limits when the area classification differs.
• Assuming data logging is included — optional up to 10,000 time-stamped readings; state need on the RFQ.
• Expecting IP67 wet washdown — brochure lists IP50 enclosure rating.
• Calibration instruments · Calibration buying guide

When to RFQ / what to tell us

1. Model (1551A Ex vs 1552A Ex), probe length/diameter class, and display resolution.
2. Hazardous-area need (Ex ib IIB T4 Gb) and ambient for the readout (−10…50 °C).
3. Optional data logging yes/no; quantity, ship-to, and any QA docs beyond included NVLAP/NIST cal.

Request a Quote · Get selection help

Specs

Documents

• Fluke Calibration 1551A/1552A datasheet (PDF)

FAQ

Q: What is the difference between 1551A and 1552A? A: 1551A Ex covers −50…160 °C with a thin-film RTD; 1552A Ex covers −80…300 °C with a wire-wound PRT. Both are ±0.05 °C (1 year) per the datasheet.

Q: Is it intrinsically safe? A: Yes — Ex ib IIB T4 Gb (ATEX/IECEx) is listed. Confirm your area classification on the RFQ.

Q: What should I send for a quote? A: Model, probe class, resolution, Ex need, logging yes/no, quantity. Compatible with systems using Fluke Calibration 1551A/1552A Stik — we do not claim authorized-dealer status.

Links

• Calibration instruments · Temperature calibrator buying guide
• Request a Quote · Get selection help