The Fluke 1551A "Stik" Thermometer provides a temperature range—50 °C to 160 °C (-58 °F to 320 °F). The Fluke 1551A delivers repeatable temperature measurements accurate to ±0.05°C over its full range. It is rated intrinsically safe for working in indoor or outdoor environments where potentially explosive gases may be present. It's a great choice for environments that aren't potential explosive as well such as the floor of a processing plant. The battery operated, portable reference thermometer is a great choice for daily checks of working thermometers, custody transfer temperature determination, PET calibration, LIG calibration, and temperature transmitter calibration and verification.
The stainless steel probe and digital readout are fixed together and calibrated as a system. The large backlit LCD display rotates 90° degrees making it easy to read from any angle. And a user-configurable stability/trend indicator lets you know when your temperature is stable enough to record an accurate measurement. A user-settable auto-off function extends typical battery life to up to 300 hours. And the low-battery indicator and stop-measure function prevents erroneous measurements from being made due to a low battery. Plus you can easily and accurately calibrate the 1551A with a simple three-point calibration function.
Other useful features:
| Specifications | |
| Temperature range | -50°C to 160°C (-58°F to 320°F) |
| Accuracy (1 year) | ±0.05°C (±0.09°F) |
| Temperature resolution | Selectable: 0.1, 0.01, 0.001 (default 0.01) |
| Sample rate | Selectable: 0.5 seconds, 1 second, 2 seconds (default 1 second) |
| Readout temperature coefficient | Add ±10 ppm/°C of full scale temperature from −10 °C to 18 °C and 28 °C to 50 °C |
| Probe temperature coefficient | 0.00385 Ω/Ω/°C nominal |
| Nominal probe resistance at 0 °C | 100 Ω |
| Probe hysteresis | ±0.01°C |
| Response time | 4.8 mm diameter probe (3/16 in): 14 seconds 6.35 mm diameter probe (1/4 in): 21 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 |
| Display units | °C, °F |
| Sensor type | 100 Ω thin-film RTD |
| Sensor length | ≤ 10 mm |
| Sensor position (from sheath tip) | 3 mm (0.1 in) |
| Minimum immersion depth | Wet medium (liquid bath, thermowell with thermal compound) 70 mm (2.8 in) Dry medium (dry-well, thermowell without thermal compound) 120 mm (4.8 in) |
| Maximum immersion depth | 50 mm (2 in) less than the total length. Make sure the last 50 mm of probe, nearest to the internal electronics of the device, are not put into the heat source. |
| Probe sheath material | Stainless steel |
| Optional data logging1 | Up to 10,000 time-stamped readings stored to internal memory |
| Logging intervals1 | 2 seconds, 5 seconds, 10 seconds, 30 seconds, or 60 seconds |
| 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 | 3-AAA alkaline batteries See Users Manual for approved batteries |
| Battery life | Approximately 300 hours (12.5 days) of continuous operation with the backlight off. |
| Battery save (auto-off) range | Selectable from 1 to 30 minutes or can be disabled |
| Safety | IEC 60079-0, IEC 60079-11: Ex ib IIB T4 Gb; IEC 61010-1: Pollution Degree 2 |
| Electromagnetic compatibility | International: IEC 61326-1: Portable Equipment; IEC 61326-2-2; CISPR 11: Group 1, Class B Group 1: Equipment has intentionally generated and/or uses conductively coupled radio frequency energy that is necessary for the internal function of the equipment itself. Class B: Equipment is suitable for use in domestic establishments and in establishments directly connected to a low voltage power supply network which supplies buildings used for domestic purposes. USA (FCC): 47 CFR 15 subpart B. This product is considered an exempt device per clause 15.103. |
| Size (readout only) | 125 mm x 62 mm x 35 mm (5 in x 2.5 in x 1.4 in) |
| Probe Size | 1551A-9: 4.8 mm x 229 mm (3/16 in x 9 in) 1551A-12: 6.35 mm x 305 mm (1/4 in x 12 in) 1551A-20: 6.35 mm x 508 mm (1/4 in x 20 in) |
| Weight | 196 g (6.9 oz) |
| Calibration (included) | NVLAP-accredited, NIST-traceable |
| Characterization | CVD |
| 1. See ordering information for optional data logging configurations | |
