Fluke 1502A, 1504 Specifications

Tweener Thermometer Readouts

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Two Tweeners to choose from—reading PRTs or thermistors

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Battery packs available

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Best price/performance package

Battery option

If you want freedom from AC power in the field or on the plant floor, order Model 2502 and we’ll install a DC power board in your Tweener. Then you can connect your own 12-volt DC power or order Hart’s 9313 Bat tery Pack. Our battery gives you three to eight hours between charges. It includes a charger and a nylon pouch with a belt clip.

Calibration choices

Each Tweener and its accompanying probe (sold separately) have their own individual calibration reports. Overall sys tem error can be calculated from the indi vidual errors, rendering the added cost of system data unnecessary. However, for those requiring it, system data is avail able at two or more temperatures of your choice. (See calibration options on page

164.)

One of Hart’s best-selling products is the Tweener thermometer, and there’s a reason. No other company, not one, has a thermometer that comes close to the performance and features of the Tweener for anywhere near its price.

1502A Tweener PRT Readout

The 1502A Tweener features accuracy up to ±0.006 °C (the 1504 is even more accurate, up to ±0.002 °C). In addition, it reads 100-ohm, 25-ohm, and 10-ohm probes, has a resolution of 0.001 °C across its entire range, and is the small est unit in its class. It also has an optional battery pack for completely portable operation.

Each Tweener is programmable to match a probe’s constants for maximum linearity and accuracy. All probe con stants and coefficients are programmed through simple, front-panel keystrokes. Temperature is displayed in °C, °F, K, or resistance in ohms.

The 1502A accurately measures the resistance of the probe and then converts theresistancetoatemperaturevalueus ing its built-in algorithms.

For convenience, the 1502A reads the common industrial grade IEC-751 or “385” ALPHA RTD without any program ming. Enter the actual R0 and ALPHA of the individual probe for increased accu racy. For maximum accuracy, use the ITS90 formulas. The Tweener accepts the subranges 4 and 6 through 11.

ITS-90 formulas reside in the Tweener’s firmware. If your probe has been calibrated for any of the above

subranges of the ITS-90, you simply enter the coefficients directly into your Tweener.

Each thermometer comes complete with an RS-232 interface for automation of temperature data collection, calibrations, or process control functions. An IEEE-488 interface is available as an option.

The 1502A is calibrated digitally using the front-panel buttons. You never have to open the box to calibrate it. This cali bration protocol further reduces the cost of the 1502A. It goes where you go and works the way you want it to.

1504 Tweener Thermistor Readout

If you need more accuracy in a limited temperature range, the Model 1504 Tweener gives it to you as a thermistor readout. Thermistors are less fragile than PRTs and less likely to be impacted by mechanical shock. Thermistors are more sensitivetotemperature,havefasterre sponse times, and come in many shapes for different applications.

Typical accuracy of a 1504 is ±0.002 °C with a resolution of 0.0001 °C.

Software

With our 9934 LogWare, both Tweener models may be used for real-time data acquisition. Collect data and analyze it graphically or statistically. Additionally, Tweeners may be used as reference ther mometers with our MET/TEMP II soft ware. (See our software section starting on page 82.)

The thermistor version of the “Tweener” gives you

more variety in sensor configurations and even higher accuracy over a limited temperature range.

52 Thermometry

Tweener Thermometer Readouts

Specifications

Temperature Range

Resistance Range

Probe

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–200 °C to 962 °C (–328 °F to 1764 °F) Any thermistor range

0Ω to 400Ω, auto-ranging 0Ω to 1 MΩ, auto-ranging

Nominal R

Characterizations ITS-90subranges4,6,7,8,9,10,and11

IPTS-68: R

Callendar-Van Dusen: R0, α, δ,andβ

Resistance Accuracy (ppm of reading)

1502A 1504

:10Ω to 100Ω

TPW

RTD, PRT, or SPRT

Steinhart-Hart thermistor polynomial

, α, δ,a4,andc

Callendar-Van Dusen: R

0Ω to 20Ω: 0.0005Ω

20Ω to 400Ω: 25 ppm

Thermistors

, α, δ,andβ

0Ω to 5 KΩ:0.5Ω

5KΩ to 200 KΩ: 100 ppm

200 KΩ to 1 MΩ: 300 ppm

Temperature Accuracy

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±0.004 °C at –100 °C

±0.006 °C at 0 °C ±0.009 °C at 100 °C ±0.012 °C at 200 °C ±0.018 °C at 400 °C ±0.024 °C at 600 °C

±0.002 °C at 0 °C ±0.002 °C at 25 °C ±0.004 °C at 50 °C ±0.010 °C at 75 °C

±0.020 °C at 100 °C

(Using 10 KΩ thermistor sensor, α=0.04.

Does not include probe uncertainty or characterization

errors.)

Operating Temperature

16 °C to 30 °C 13 °C to 33 °C

Range

Resistance Resolution

0Ω to 20Ω: 0.0001Ω

20Ω to 400Ω: 0.001Ω

0Ω to 10 KΩ:0.01Ω

10 KΩ to 100 KΩ:0.1Ω

100 KΩ to 1 MΩ:1Ω

Temperature Resolution 0.001 °C 0.0001 °C

Excitation Current 0.5 and 1 mA, user selectable, 2 Hz

2 and 10 μA, automatically selected

Measurement Period 1 second

Digital Filter Exponential, 0 to 60 seconds time constant (user selectable)

Probe Connection 4-wire with shield, 5-pin DIN connector

Communications RS-232 serial standard

IEEE-488 (GPIB) optional

Display 8-digit, 7-segment, yellow-green LED; 0.5-inch-high characters

Power 115 VAC (±10 %), 50/60 Hz, 1 A, nominal

230 VAC (±10 %), 50/60 Hz, 1 A, nominal, specify

Size (HxWxD) 61 x 143 x 181mm (2.4 x 5.6 x 7.1 in)

Weight 1.0 kg (2.2 lb.)

Calibration Accredited NIST-traceable calibration provided

Probes from Hart See pages 62 to 68 See pages 70 to 75

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Temperature ranges and accuracy may be limited by the sensor you use.

Ordering Information

1502A Tweener PRT Readout 1504 Tweener Thermistor Readout 2502 DC Power Option 2505 Spare Connector 2506 IEEE Option 2507 Mini-Printer 2508 Serial Cable Kit 9934-S LogWare, Single Channel, Single

User

9934-M LogWare, Single Channel, Multi

User

9313 Battery Pack 9301 Carrying Case, fits Tweener and

12 in probe

1935 System Cal Report, Thermistors

(see pages 164 to 167)

1930 System Cal Report, PRT

(see pages 164 to 167)

See pages 60 to 80 for a selection of probes to use with Tweeners and other Hart readouts.

www.hartscientific.com 53