HYDRA

Service Manual

Note

If other than a K type thermocouple is used, be sure that the instrument is set up for the type of thermocouple used.

3.Reconnect power and switch the instrument ON.

4.Insert the thermocouple and a mercury thermometer (.02 degrees Celsius resolution) in a room temperature bath. Allow 20 minutes for thermal stabilization.

5.Select the temperature function and K thermocouple type for channel 1. Then press MON.

6.The value displayed should be the temperature of the room temperature bath (within tolerances given in Table 4-4) as measured by the mercury thermometer.

7.The Thermocouple Temperature Accuracy Test is complete. However if you desire to perform this test on any other Input Module channel (2 through 20) repeat steps 1 through 6 substituting in the appropriate channel number.

Table 4-3. Thermocouple Information

Type

J

C†

b

S

Positive Lead

Material

Iron

Tungsten

(5% Rhenium)

Platinum

(30% Rhodium)

Platinum

Positive Lead Color

ANSI*

IEC**

 

 

White

Black

White

—

Gray

—

Black

Orange

 

 

Negative Lead

Material

Constantan

Tungsten

(26% Rhenium)

Platinum

(6% Rhodium)

Platinum

(10% Rhodium)

Usable Range

(°C)

-200 to 760 0 to 2316

0 to 1820

-50 to 1768

R

Platinum

Black

Orange

Platinum

(13% Rhodium)

-50 to 1768

N

T‡

E

K

NICROSIL

Copper

Chromel

Chromel

Orange

Blue

Purple

Yellow

—

Brown

Violet

Green

NISIL

Constantan

Constantan

Alumel

-270 to 1300 -270 to 400 -270 to 1000 -270 to 1372

*American National Standards Institute (ANSI) device negative lead is always red.

**International Electrotechnical Commission (IEC) device negative lead is always white.

† Not an ANSI designation but a Hoskins Engineering Company designation.

‡ An ANSI type T is supplied with the meter.

Table 4-4. Performance Tests for Thermocouple Temperature Function

Thermocouple Type

J

K

N

E

T

Themocouple Temperature Function

1Year @ 18-28°C

±0.4°C

±0.5°C

±0.6°C

±0.4°C

±0.5°C

4-10

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Fluke 2635A, 2625A Thermocouple Information Type Positive Lead Material, Positive Lead Color, Negative Lead Material
Page 149 Page 151

2635A, 2625A specifications

The Fluke 2625A is a sophisticated data logger designed for a wide range of industrial and laboratory applications. This versatile instrument excels in capturing and monitoring temperature and voltage measurements with precision and reliability. One of its standout features is its ability to record data from various sensors, making it ideal for environments where comprehensive data acquisition is critical.

Equipped with a large LCD display, the Fluke 2625A provides clear and user-friendly access to real-time measurement data. Its graphical interface allows users to visualize trends and monitor readings easily, which significantly enhances usability. The device supports a variety of input types and can connect to thermocouples, RTDs, and other sensors, offering great flexibility for various measurement tasks.

The Fluke 2625A employs advanced measurement technologies that ensure accuracy in data logging. With a high sampling rate, it captures fast-changing signals while maintaining data integrity. The device features a built-in memory that allows for extensive logging, accommodating long-term monitoring tasks without requiring constant oversight. Users can set it to log data at specified intervals, offering customizable solutions for different monitoring needs.

Another significant characteristic of the Fluke 2625A is its robust communication capabilities. The device supports USB and RS-232 interfaces for easy connectivity with computers and other devices, making data transfer and analysis seamless. This feature is especially beneficial for users who need to compile or analyze large sets of data quickly.

Furthermore, the Fluke 2625A is designed with durability in mind. Its rugged construction makes it suitable for challenging environments, including those with high levels of vibration, dust, or moisture. This reliability ensures that the device can withstand the rigors of fieldwork while still delivering accurate measurements.

In summary, the Fluke 2625A is a powerful data logger that combines versatility, accuracy, and reliability. Its user-friendly interface, advanced measurement technologies, and robust design make it an essential tool for professionals in various industries, from manufacturing and HVAC to research and development. Whether monitoring temperature changes in a laboratory or assessing voltage levels in an industrial setting, the Fluke 2625A stands out as a trusted solution for effective data logging and analysis.
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