Quick Start Guide
7
August 2017
2.3
Barstock thermowell sensor assembly
(1)
1. The Rosemount 644 is available with or without a LCD display.
Sensor with flying leads,
terminal block, or
spring-loaded adapter
Weld-in,
threaded or
flanged
barstock
thermowells
Rosemount
3144
Stand-alone
extensions
Rosemount
248
Rosemount
644
Rosemount IP 68
or IP 65
connection heads
Rosemount 644 with
LCD display meter
40 mm
Head or field
mount transmitters
11 mm
L
11 mm
16 mm
N
★★
11 mm
11 mm
60 mm
★★★
U
U
U
60
mm
L
L
★★
N dimension measures from
thread engagement point.
★★★
This dimension is 80 mm for
Class 1500 and Class 2500
flanges.
N
★★
N
★★
25 mm
T
U
40 mm
U
60
mm