Emerson 5081-T instruction manual RTD Resistance Values, Formula, Example

MODEL 5081-T

10.6 RTD RESISTANCE VALUES

Table 10-4 is a ready reference of RTD resistance values at various temperatures. These are used for test and evaluation of the sensor.

NOTE

Resistance values are read across the RTD element and are based on the manu- facturer’s stated values (±1%). Allow enough time for the RTD element in the sensor to stabilize to the surrounding temperature (10 min).

SECTION 10.0

DIAGNOSIS AND TROUBLESHOOTING

Table 10-4. RTD Resistance Values.

Temperature	Pt-100	Pt-1000
(°C)	Resistance (ohms)	Resistance (ohms)
0	100.00	1000
10	103.90	1039
20	107.79	1078
25	109.62	1096
30	111.67	1117
40	115.54	1155
50	119.40	1194
60	123.24	1232
70	127.07	1271
80	130.89	1309
90	134.70	1347
100	138.50	1385

Use the following formula to determine the appropriate resistance value to use to simulate a conductivity value:

FORMULA:

cell constant value x 1,000,000	= resistance in ohms
desired simulated conductivity in ∝s/cm

EXAMPLE:

.01 x 1,000,000

10 ∝s/cm

= use 1,000 ohm resistance

FIGURE 10-5. Conductivity Determination

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