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Fluke 1551A Ex
Intrinsically Safe “Stik” Thermometer

  • –50 to 160 °C
  • Accurate to ± 0.05 °C (±0.09 °F) over full range
  • Intrinsically safe (ATEX and IECEx compliant)
  • Display temperature in °C or °F
  • User-configurable temperature Trend/Stability indicator
  • Optional data logging to internal memory available
  • 300-hour battery life
  • Percent battery-life and low-battery indicator
  • NVLAP-accredited, NIST-traceable calibration included
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Fluke 1551A Ex Shown

Product Information
Manual 118 KB PDF
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The new “Stik” Thermometer from Fluke Calibration is the best substitute for precision mercury- or spirit-filled glass thermometers. The RTD probe and thermometer readout are combined into one unit and calibrated as a system. Intrinsically safe and accurate to ±0.05 °C over full range. The 1551A features a robust thin-film RTD sensor, ranges from –50 °C to 160 °C and primarily targets the petroleum industry. Of course many other industries have applications that require an easy-to-use, stable and portable reference thermometer and the “Stik” Thermometer is the perfect solution.
Specification Fluke 1551A Ex
Temperature range -50 °C to 160 °C
(-58 °F to 320 °F)
Accuracy (1 year) ± 0.05 °C (± 0.09 °F)
Display units °C, °F
Sensor type 100 Ω thin-film RTD
Probe temperature coefficient 0.00385 Ω/Ω/°C nominal
Sensor length ≤ 10 mm
Sensor position (from sheath tip) 3 mm (0.1 in)
Minimum immersion depth1 7 cm (2.8 in)
Probe sheath material SST
Response time 4.8 mm diameter probe (3/16 in): 14 seconds
6.35 mm diameter probe (1/4 in): 21 seconds
Probe hysteresis ± 0.01 °C
Temperature resolution Selectable: 0.1, 0.01, 0.001 (default 0.01
Sample rate Selectable: 0.5 seconds, 1 seconds, 2 seconds (default 1 seconds
Operating temperature range readout -10 °C to 50 °C (14 °F to 122 °F)
Storage temperature -20 °C to 60 °C (-4 °F to 140 °F)
0 % to 95 % RH, non-condensing
Optional data logging2 Up to 10,000 time-stamped readings stored to internal memory
Logging intervals2 2 seconds, 5 seconds, 10 seconds, 30 seconds, or 60 seconds; 2 minutes, 5 minutes, 10 minutes, 30 minutes, or 60 minutes
Damping Moving average of the most recent 2 to 10 readings (ON/OFF, 2, 5, 10)
Communications RS-232 stereo jack (access calibration parameters only)
AC power None
DC power Three AAA batteries, typical battery life of 300 hours without LCD backlight
EMC compliance EN61326:2006 Annex C; CISPR II Edition 5.0-2009; Class “B”
Enclosure rating IP50
Electronics dimensions (H x W x D) 114 mm x 57 mm x 25 mm (4.5 in x 2.25 in x 1.0 in)
Weight 196 g (6.9 oz)
Calibration (included) NVLAP-accredited, NIST-traceable
Characterization CVD
Ordering Information
Model  Description Buy Online Price
MFR ID: 3624136
Fluke Calibration 1551A-9 Thermometer, Fixed RTD, -50 To 160C, 3/16x12 Buy Now Sale $697.50
(Reg. $775.00)
MFR ID: 3936019
Fluke Calibration 1551A-9-DL Thermometer, Fixed RTD, -50 To 160C, 3/16x12 with datalog Buy Now Sale $868.50
(Reg. $965.00)
MFR ID: 3624149
Fluke Calibration 1551A-12 Thermometer, Fixed RTD, -50 To 160C, 1/4x12 Buy Now Sale $666.00
(Reg. $740.00)
MFR ID: 3936037
Fluke Calibration 1551A-12-DL Thermometer, Fixed RTD, -50 To 160C, 1/4x12 with datalog Buy Now Sale $868.50
(Reg. $965.00)
MFR ID: 3935995
Fluke Calibration 1551A-20 Thermometer, Fixed RTD, -50 To 160C, 1/4x20 Buy Now Sale $729.00
(Reg. $810.00)
MFR ID: 3936055
Fluke Calibration 1551A-20-DL Thermometer, Fixed RTD, -50 To 160C, 1/4x20 with datalog Buy Now Sale $895.50
(Reg. $995.00)
Included Accessories
  • 1 - Users Manual on CD-ROM
Optional Accessories
MFR ID: 3624160
Fluke Calibration 1551-CASE Carrying Case for 1551/1552 Buy Now Sale $81.00
(Reg. $90.00)
MFR ID: 3936096
Fluke Calibration 1551-CBL Cable RS-232, 155X Buy Now Sale $54.00
(Reg. $60.00)