Questions And Answers - Intab PC-Logger 2100 User Manual

8

Questions and Answers

Q: I am recording ambient air temperature using T/C´s type "K" and all values are
jumping up and down. Some values, like -3000°C, are absurd! What causes this?
A: You have forgotten to connect the "-" input to Gnd. Your signal is floating around
without any connection to ground reference. See chapter 3 .
Q: I am logging temperature with T/C´s type "K". The logger indicates a
temperature when I actually lower it. Why is this?
A: You reversed the T/C leads. The red wire is the negative lead.
Q: I am going to log temperature in two places along a metal hot water pipe. Both
thermocouples are welded to the pipe. How do I go about connecting them to the
logger?
A: Since both hot junctions are in contact with a metallic object only one negative lead
should and may be connected to "Gnd". Alternatively you may run a separate wire
from the pipe to "Gnd". All other methods will result in ground loops that may spoil
your measurements.
Q: I want to sample data at the highest possible rate. The memory has to hold data of a
full week.
How do I calculate the shortest possible sampling interval?
A: The memory of the "2100" can hold 112 000 values.
1 week = 604 800 seconds. 604 800 / 112 000 = 5.4 !
Select an interval of 6 seconds for a week long recording on one channel.
You don't really have to make calculations like this. The software will always tell
you how long the memory will last for every set of parameters you program.
Page 30
INTAB Interface-Teknik AB, Sweden
rising