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. . . ADDENDUM FOR FLANGE-MOUNTED TRANSMITTERS
Model 621ES differential transmitter
This model, as already said, is suitable for liquid level measurement.
The fluid, in this case, must be clean, free of solids and not viscous. This because the process diaphragm is recessed as regards
the flange face.
The model 621ES differential transmitter has been designed to connect to a flanged tank nozzle, or similar ANSI (DIN) fitting.
Standard connections for 2/3-inch Class 150/300, and equivalent DIN, are available (see Figures 1 and 2).
This model is specifically dedicated to closed (pressurized) tanks (see Figure 4 and Applications n°2 and n°3).
Mounting recommendations are like those of model 621ES level transmitter.
Electrical connections
86 (3.39)
Covers
locking
screw
Drain/vent
valve
Process
connection
27 (1.06)
71 (2.80)
RATING
SIZE
ANSI 150 R.F.
ANSI 150 R.F.
ANSI 300 R.F.
ANSI 300 R.F.
DN 50
DIN ND 16 FORM C
DN 80
DIN ND 16 FORM C
DN 50
DIN ND 40 FORM C
DN 80
DIN ND 40 FORM C
- 44 -
+
Flange/adapter
59 (2.32)
G
Mounting
F
flange
A
B
2"
53 (2.09)
92 (3.62)
3"
77 (3.04)
127 (5.0)
2"
53 (2.09)
92 (3.62)
3"
77 (3.04)
127 (5.0)
53 (2.09)
102 (4.02)
77 (3.04)
138 (5.43)
53 (2.09)
102 (4.02)
77 (3.04)
138 (5.43)
26
17
(1.02)
(0.67)
Min. clearance
to remove
the cover
Integral
display
housing
Electronic
side
C
D
152.5 (6.0)
120.6 (4.75)
190.5 (7.5)
152.4 (6.0)
165 (6.50)
127 (5.0)
210 (8.26)
168.5 (6.63)
165 (6.50)
125 (4.92)
200 (7.87)
160 (6.30)
165 (6.50)
125 (4.92)
200 (7.87)
160 (6.30)
Identification tag
Adjustments
36
127 (5.00)
(1.42)
E
No.of
E
F
holes
20 (0.79)
4
19.5 (0.77)
20 (0.79)
4
24 (0.94)
20 (0.79)
8
22.5 (0.89)
22 (0.86)
8
28.5 (1.12)
18 (0.71)
4
20 (0.79)
18 (0.71)
8
20 (0.79)
18 (0.71)
4
20 (0.79)
18 (0.71)
8
24 (0.94)
17
(0.67)
Certification
label
Output meter
housing
Terminal
side
G
1.6 (0.07)
1.6 (0.07)
1.6 (0.07)
1.6 (0.07)
3 (0.12)
2 (0.08)
3 (0.12)
2 (0.08)
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