Rosemount Model 3144 and 3244MV Smart Temperature Transmitters
2-8
Figure 2-6. Transmitter Jumper
Locations.
SENSOR CONNECTIONS
Figure 2-7 on page 2-9 shows the correct input connections to the
sensor terminals on the transmitter. To ensure an adequate sensor
connection, anchor the sensor lead wires beneath the flat washer on the
terminal screw. Do not remove the transmitter cover in explosive
atmospheres when the circuit is alive. Both transmitter covers must be
fully engaged to meet explosion-proof requirements. Use extreme
caution when making contact with the leads and terminals.
RTD or Ohm Inputs
If the transmitter is mounted remotely from a 3- or 4-wire RTD, it will
operate within specifications, without recalibration, for lead wire
resistances of up to 10 ohms per lead (equivalent to 1,000 feet of 20
AWG wire). In this case, the leads between the RTD and transmitter
should be shielded. If using only two leads (or a compensation loop lead
wire configuration), both RTD leads are in series with the sensor
element, so significant errors can occur if the lead lengths exceed one
foot of 20 AWG wire. For longer runs, attach a third or fourth lead as
described above.
Thermocouple or Millivolt
Inputs
For direct-mount applications, connect the thermocouple directly to the
transmitter. If mounting the transmitter remotely from the sensor, use
appropriate thermocouple extension wire. Make connections for
millivolt inputs with copper wire. Use shielding for long runs of wire.
NOTE
The use of two grounded thermocouples with a Model 3244MV
transmitter is not recommended. For applications in which the use of
two thermocouples is desired, connect either two ungrounded
thermocouples, one grounded and one ungrounded thermocouple, or one
dual element thermocouple.
Security Jumper
Failure Mode Jumper
(without a Meter Installed)
Failure Mode Jumper
(with a Meter Installed)
314
4-
0
200G
01A
,
2352
A
01D
See “Safety Messages” on page 2-1 for complete warning information.
