ACR Electronics SmartReader Plus Instrukcja Użytkownika Pobierz pdf (Strona 43)

SmartReader Data Logger

(32 to 1750°F)

2 (Wide)

0 to 1760°C

(32 to 3200°F)

23°C (41.5°F)

Type T Thermocouple Inputs

Thermocouple

Equation

Range

Resolution

1 (Narrow)

-35 to 200°C

(-30 to 390°F)

1.7°C (3°F)

2 (Wide)

-200 to 400°C

(-325 to 750°F)

6.7°C (12°F)

Specifications are subject to change without notice.

1.8.4 Calibration

Low and Mid Calibration Values

The Low calibration value compensates for offset while Mid compensates for span. These

values are set at the factory using an accurate millivolt reference. The following procedure

may be used if you want to calibrate each channel to a specific piece of thermocouple wire:

1. Change the equation number of the channel you want to calibrate to 38, and replace any

previous Low and Mid calibration values with zero (0). Make sure you have selected Byte

Count data units.

2. Short the "+" and "-" terminals of the channel with a piece of wire. Observe the Realtime

value for the channel.

3. Enter a Low calibration value of 50 - R, where R = the Realtime value observed in the

previous step.

4. Change the equation number to the correct one for your thermocouple type and connect

the highest possible temperature reference to the channel. Make sure you have selected

Celsius temperature units. Observe the Realtime values for the thermocouple channel

and the internal temperature channel (Channel 0.)

5. Calculate the Mid calibration value using this formula:

100 x ( (A - C) - (B - C) ) / (A - C)

where:

A = thermocouple channel reading

B = high reference temperature

C = internal temperature channel reading

For example, if your thermocouple channel reads 502°C at a high reference of 500°C,

and the internal temperature channel reads 25°C, the Mid calibration value is equal to:

100 x ( (502 - 25) - (500 - 25) ) / (502 - 25) = 0.419

1 2 ... 38 39 40 41 42 43 44 45 46 47 48 ... 102 103

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