The 1523/24 Reference Thermometers from Fluke’s Hart Scientific Division measure, graph, and record PRTs, thermocouples, and thermistors. These thermometer readouts deliver exceptional accuracy, wide measurement range, logging, and trending, all in a handheld tool you can take anywhere.
The 1523/24 lets you handle field applications, laboratory measurements, and data logging with ease. And with the dual channel measurement capabilities of the model 1524, you can do twice the work in half the time.

Three sensor types

PRTs: –200 °C to 1000 °C Thermocouples –200 °C to 2315 °C Precision thermistors: –50 °C to 150 °C

Accuracy

PRTs: up to ±0.011 °C Thermocouples : ±0.24 °C for J,K,L,M Precision thermistors: ±0.002 °C

Fast mode

PRTs: 0.45 seconds per sample Thermocouples: 0.3 second per sample Precision thermistors: 0.3 seconds per sample

Two models

1523: Single channel standard model; memory for 25 readings and statistics 1524: Two channels; memory for logging 15,000 measurements; real-time clock for time and date stamps

Graphical display

128x64 backlit LCD graphic display Plot and scale trends in real time Simultaneous dual channel readings

Like all Fluke handheld tools, the 1523/24 Reference Thermometers endure rigorous testing in temperature extremes and under harsh conditions of vibration, so you can take them anywhere you need to go.

An optional magnetic hanger allows you to hang the thermometer for easy viewing while freeing your hands to focus on the job.

INFO-CON connectors ensure correct temperature conversion
Inside the INFO-CON, a memory chip keeps calibration information for the attached probe. Simply plugging in the probe uploads the information to the readout, ensuring the correct temperature conversion for accurate, hassle-free measurements.

Probes may be locked by password to specific channels and readouts for security or for system calibration traceability. Plug any thermocouple with mini-thermocouple jacks into an optional universal thermocouple adapter for convenient measurement. Each thermocouple adapter or standard connector supports reference junction compensation (RJC) with its own internal precision thermistor.

Monitor trends in the lab or in the field
See trends graphically on the 1523/24 thermometer’s 128x64-backlit LCD display. You can change the graph’s resolution at the touch of a button. Now it’s easy to see when the temperature is stable, without statistics or long delays, or monitor processes over time to verify correct operation.

Document on demand up to 25 readings and associated statistics for easy retrieval. You can view the data through the display or by uploading it to a PC via RS-232 connection and 9940 software, included free. To monitor and log more data over time, use a PC and optional LogWare II software.

RS-232-to-USB adapters are available for those who prefer USB connectors. Battery power lasts at least 20 hours on three AA batteries, or use the dc power adapter for extended periods of measurement. Power saving features can be enabled or disabled for longer battery life or greater convenience.

Two models let you make the best choice for your application
The 1523 Reference Thermometer is a versatile single-channel thermometer that measures, graphs and records three sensor types with one tool. Support for PRTs/RTDs, thermocouples, and thermistors provides flexibility to choose the right probe for the job.

The new 1524 Reference Thermometers help you do twice the work in half the time. Two channels and three sensor types and high-speed measurement make you more productive and make model 1524 the one reference thermometer you need to own. It has all the features of the 1523, and it’s a data logger too. A real-time clock and memory for 15,000 time and date stamped measurements mean everything you are going to need is in this package. Log up to three times per second, or once every hour or other options in between. Download the data to a PC for analysis when you need it.

Applications
Calibration, loop checking, plant startup, troubleshooting, maintenance, and repair are some of the varied duties that need a 1523/24 thermometer. Use it for a handy temperature reference in baths, dry-block calibrators, thermowells, clean rooms, engines, heat exchangers, furnaces, freezers, or anything else that must be calibrated, checked, or maintained.

Specifications
Input Channels	1523: 1  1524: 2
Logging	1523: 25 readings with statistics  1524: 15,000 time and date stamped; 25 readings with statistics
Sample interval (normal)	1 seconds
Sample interval (fast mode)	0.3 seconds (see technical manual for details)
Sensor Types	PRTs, RTDs, Thermistors, and Thermocouples
Thermocouple Types	C,E,J,K,L,M,N,T,U,B,R,S
Operating temperature	-10 ºC to 60 ºC (Best accuracy 13 ºC to 33 ºC)
Power requirements	3 AA alkaline batteries
Size	96 x 200 x 47 mm  (3.75 x 7.9 x 1.86 inches)
Weight	0.65 kg (1.4 lb)
Environmental conditions for best accuracy	13 °C to 33 °C
Millivolt Range and Accuracy	–10 mV to 75 mV ± (0.005 % + 5 μV)
Resistance Range and Accuracy	0 Ω to 400 Ω ± (0.004 % + 0.002 Ω)  200 Ω to 50 kΩ± (0.01 % + 0.5 Ω)  50 kΩ to 500 kΩ± (0.03 %)
Temperature Coefficient, Voltage ( –10 °C to 13 °C , +33 °C to 60 °C)	± (0.001 %/°C + 1 μV/°C)
Temperature Coefficient, Resistance ( –10 °C to 13 °C , +33 °C to 60 °C)	0.0008 %/°C + 0.0004 Ω(0 Ω to 400 Ω)  0.002 %/°C + 0.1 Ω(0 Ω to 50 kΩ)  0.06 %/°C + 0.1 Ω(50 kΩ to 500 kΩ)
Excitation Current, Resistance	1 mA (0 Ω to 400Ω)  10 μA (0 Ω to 50 kΩ)  2 µA (50 kΩ to 500 kΩ)

Thermocouple equivalent temperature accuracies (readout only)
Type B	± 0.85 ºC from 600 ºC to 800 ºC  ± 0.68 ºC from 800 ºC to 1000 ºC  ± 0.57 ºC from 1000 ºC to 1800 ºC
Type C	± 0.32 ºC from 100ºC to 550 ºC  ± 0.71 ºC from 550 ºC to 2300 ºC
Type E	± 0.52 ºC from -200 ºC to 0 ºC  ± 0.22 ºC from 0 ºC to 950 ºC
Type J	± 0.52 ºC from -200 ºC to 0 ºC  ± 0.23 ºC from 0 ºC to 1200 ºC
Type K	± 0.61 ºC from -200 ºC to 0 ºC  ± 0.24 ºC from 0 ºC to 1370 ºC
Type L	± 0.36 ºC from -200 ºC to 0 ºC  ± 0.23 ºC from 0 ºC to 1370 ºC
Type M	± 0.26 ºC from -20 ºC to 0 ºC  ± 0.25 ºC from 0 ºC to 400 ºC  ± 0.22 ºC from 400 ºC to 1400 ºC
Type N	± 0.72 ºC from -200 ºC to 0 ºC  ± 0.28 ºC from 0 ºC to 1300 ºC
Type R	± 1.09 ºC from -20 ºC to 0 ºC  ± 0.97 ºC from 0 ºC to 500 ºC  ± 0.49 ºC from 500 ºC to 1750 ºC
Type S	± 1.05 ºC from -20 ºC to 0 ºC  ± 0.95 ºC from 0 ºC to 500 ºC  ± 0.56 ºC from 500 ºC to 1750 ºC
Type T	± 0.60 ºC from -200 ºC to 0 ºC  ± 0.25 ºC from 0 ºC to 400 ºC
Type U	± 0.54 ºC from -200 ºC to 0 ºC  ± 0.24 ºC from 0 ºC to 400 ºC
Note 1:	Accuracies are based on internal Reference Junction Compensation. Refer to Technical manual for equivalent accuracies with an external reference junction.

1523/24 Accuracies with selected probes (±°C)
-200 °C	5616-12: 0.014  5615-6: 0.025  5627A-12: 0.027  5610-9: n/a
0 °C	5616-12: 0.021  5615-6: 0.021  5627A-12: 0.049  5610-9: 0.009
100 °C	5616-12: 0.027  5615-6: 0.028  5627A-12: 0.065  5610-9: 0.009
300 °C	5616-12: 0.040  5615-6: 0.043  5627A-12: 0.103  5610-9: n/a
420 °C	5616-12: 0.050  5615-6: n/a  5627A-12: 0.130  5610-9: n/a
Note 2:	Includes readout accuracy, probe calibration, and probe drift

PRT equivalent temperature accuracy (readout only)
–100 °C	± 0.011
0 °C	± 0.015
100 °C	± 0.019
200 °C	± 0.023
400 °C	± 0.031
600 °C	± 0.039

Thermistor equivalent temperature accuracy (readout only)
0 °C	± 0.002
25 °C	± 0.003
50 °C	± 0.006
75 °C	± 0.014
100 °C	± 0.030