Emerson Rosemount 848T Reference Manual page 30

Installation
September 2019
3.3.6 Pt100 2-wire RTD
Lead wire resistance seen by the transmitter = 150 m × 2 wires × 0.025 Ω/m = 7.5 Ω
Basic Error =
Error due to amb. temp. var. of ±25 °C =
3.3.7 4–20 milliamp inputs
This section details the wiring and configuration of the 848T to monitor a 4–20 mA signal
using the S002 option code. This technique is used to capture data from a 4–20 mA device
that does not have a connection to traditional loop control or monitoring system.The
848T measures millivolt signals, to monitor a 4–20 mA signal there must be a conversion
to millivolt using a 5 ohm resistor to create a 20–100 mV signal. It is optimal to use a 5
ohm resistor with stable operation over the ambient temperature range where the 848T is
located. See
30
= ±0.1266 °C
= ±1.9 °C
Figure 3-6 below for information on wiring.
= 19.5 °C
Emerson.com/Rosemount
Reference Manual
00809-0100-4848