8
Calibration
NOTE: Steps 1 - 3 are only required if calibrating model TT230. If calibrating model TT190, then skip
to step 4.
1.
Desired Zero (4 mA) temperature must be within the limits specified in table below.
2. Select desired span from the table. Temperature Span equals the desired temperature at 20 mA
minus the desired temperature at 4 mA. For example, suppose you have an RC range Temptran,
and you want to calibrate to a range of -50 to 200 C, then the span = 200 - (-50) = 250 C.
Temperature Span
T/C Type:
K
E, J, K, T
K
Connect:
RB range
RC range
RE range
1 - A
50 to 70 °C
150 to 200 °C
300 to 400 °C
2 - A
70 to 100 °C
200 to 300 °C
400 to 600 °C
3 - A
100 to 200 °C
300 to 600 °C
600 to 1200 °C
Zero (4 mA):
-50 to 50 °C
-100 to 200 °C
-100 to 500 °C
3.
Bend over the lead designated 1, 2, or 3, depending on selection from table, to the A lead and
solder. See Figure 1 below. For the above example, lead 2 should be soldered to lead A.
4.
Connect a power supply of 24 VDC, and a digital milliammeter (5-1/2 digit preferred) as shown in
figure 1, or use a loop calibrator instead of the DC supply and milliammeter.
Figure 1
Figure 1