Measurement-computing WEB-TEMP Manuel d'utilisateur télécharger pdf (Page 29)

Chapter 6

Specifications

All specifications are subject to change without notice.

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Analog input

Table 1. Generic analog input specifications

Parameter

Condition

Specification

A/D converters

Four dual 24-bit, Sigma-Delta type

Number of channels

8 differential

Input isolation

500 VDC minimum between field wiring and

power supply input.

Channel configuration

Software programmable to match sensor type

Differential input voltage range

Thermocouple

±0.080 V

RTD

0 V to 0.5 V

Thermistor

0 V to 2 V

Semiconductor sensor

0 V to 2.5 V

Absolute maximum input

voltage

±C0x through ±C7x relative to

AGND

±25 V (power on)

±40 V (power off)

Input impedance

5 GΩ (power on)

1 MΩ (power off)

Input leakage current

Open thermocouple detect disabled

30 nA max

Open thermocouple detect enabled

105 nA max

Common mode rejection ratio

= 60 Hz

100 dB min

ADC resolution

24 bits

ADC No missing codes

24 bits

Input coupling

Warm-up time

30 minutes min

Open thermocouple detect

Automatically enabled when the channel pair is

configured for thermocouple sensor.

The maximum open detection time is 3 seconds.

CJC sensor accuracy

15 °C to 35 °C

–0.75 °C to 0.5 °C max

0 °C to 55 °C

–1.5 °C to 1.25 °C max

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 39 40

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Measurement-computing WEB-TEMP Manuel d'utilisateur Page 29

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