Rosemount Models 3144 and 3244MV Smart Temperature Transmitters
6-4
Transient Protection
(Option Code T1)
The transient protector helps to prevent damage to the transmitter
from transients induced on the loop wiring by lightning, welding, heavy
electrical equipment, or switch gears. The transient protection
electronics are contained in an add-on assembly that attaches to the
standard transmitter terminal block. The transient protector has been
tested per the following standard:
ANSI/IEEE C62.41-1991 (IEEE 587), Location Categories A2, B3.
1kV peak (10 3 1000 mS Wave)
6kV / 3kA peak (1.2 3 50 mS Wave 8 3 20 mS Combination Wave)
6kV / 0.5kA peak (100 kHz Ring Wave)
4kV peak EFT (5 3 50 nS Electrical Fast Transient)
Loop resistance added by protector: 22 ohms max.
Nominal clamping voltages: 90 V (common mode), 77 V (normal mode)
Figure 6-2. Transmitter Terminal Block
with the Transient Protector Installed.
Hot Backup
(Option Code U1)
This configuration should be selected in critical applications where
Sensor 1 is the preferred measurement. If Sensor 1 fails, Hot Backup
will be activated and Sensor 2 will become the primary variable.
Power Supply
3
144-
3040
A
02A
Option Code U1
3244MV Custom Output Configuration
Primary Variable (4–20 mA)
Sensor 1
Secondary Variable
Sensor 2
Tertiary Variable
Terminal Temperature
Quaternary Variable
Not Used