Measurement-computing WEB-TEMP Uživatelský manuál stáhnout pdf (Strana 33)

WEB-TEMP User's Guide Specifications

Note 11: Error shown does not include errors of the sensor itself. The sensor linearization is performed

using a Steinhart-Hart linearization algorithm. The accuracy and tempco specifications include the

accuracy of the Callendar-Van Dusen linearization algorithm. These specifications are for one year

while operation of the device is between 15 °C and 35 °C. The specification does not include lead

resistance errors for 2-wire thermistor connections. Contact your sensor supplier for details on the

actual sensor error limitations. Total thermistor resistance on any given channel pair must not exceed

180 kΩ. Typical resistance values at various temperatures for supported thermistors are shown in Table

Table 8. Typical thermistor resistance specifications

Temp (°C)

2252 Ω

thermistor

3000 Ω

thermistor

5 kΩ

thermistor

10 kΩ

thermistor

30 kΩ

thermistor

–40

76 kΩ

101 kΩ

168 kΩ

240 kΩ (Note 12)

885 kΩ (Note 12)

–35

55 kΩ

73 kΩ

121 kΩ

179 kΩ

649 kΩ (Note 12)

–30

40 kΩ

53 kΩ

88 kΩ

135 kΩ

481 kΩ (Note 12)

–25

29 kΩ

39 kΩ

65 kΩ

103 kΩ

360 kΩ (Note 12)

–20

22 kΩ

29 kΩ

49 kΩ

79 kΩ

271 kΩ (Note 12)

–15

16 kΩ

22 kΩ

36 kΩ

61 kΩ

206 kΩ (Note 12)

–10

12 kΩ

17 kΩ

28 kΩ

48 kΩ

158 kΩ

–5

9.5 kΩ

13 kΩ

21 kΩ

37 kΩ

122 kΩ

7.4 kΩ

9.8 kΩ

16 kΩ

29 kΩ

95 kΩ

Note 12: Resistance values greater than 180 kΩ cannot be measured by the WEB-TEMP in the thermistor

mode. The 180 kΩ resistance limit includes the total resistance across the current excitation (±Ix) pins,

which is the sum of the thermistor resistance and the lead resistances.

Note 13: For accurate three wire compensation, the individual lead resistances connected to the ±Ix pins

must be of equal ohmic value. To ensure this, use connection leads of equal lengths.

Throughput rate

Table 9. Throughput rate specifications

Number of input channels

Maximum throughput

2 S/s

2 S/s on each channel, 4 S/s total

2 S/s on each channel, 6 S/s total

2 S/s on each channel, 8 S/s total

2 S/s on each channel, 10 S/s total

2 S/s on each channel, 12 S/s total

2 S/s on each channel, 14 S/s total

2 S/s on each channel, 16 S/s total

Note 14: The analog inputs are configured to run continuously. Each channel is sampled twice per second.

The maximum latency between when a sample is acquired and the temperature data is provided by the

Ethernet unit is approximately 0.5 seconds.

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