Inch and Metric Size,
Plastic Fluid Level Sight Glasses
With or Without Reflector

EN 541
Elesa Model HFTX


RoHS Compliant
 

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Specification
Information
Housing: Special transparent polyamide technopolymer plastic (PA 6-T)
Reflector: Star-shaped anodized aluminum with central level sight dot 
Packing ring: NBR synthetic rubber (Perbunan)

Shipping

Elesa® original design technopolymer plastic fluid level sight glasses.
EN 541 sight glasses are practically indestructible. Even at high torque there is no danger of any breakage.
Can also be used in pressurized tanks. The maximum allowable pressure is dependent on the tank size operating conditions (i.e. temperature). Test results are available upon request.
Resistant to solvents, oils, grease and other chemical agents, but not suitable for alcohol.
The particular shape of the lenticular window increases and improves visibility even from side positions.
A moderate torque (see table) is recommended when tightening oil level indicator so as to guarantee optimal tightness without any elastic deformation.
For mounting on walls of less than 4 mm thickness please use GN 543.1 Thin Hex Nuts.
BSPP thread sizes available upon request.
Maximum continuous working temperature at 3 Bar pressure: 210°F (100°C).

See our Technical Section for pipe thread size details and pressure ratings.
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 BSPP Parallel Thread Table

Dimensions in:

millimeters
(inches)

Part Number
d1
window glass
d2
Thread
d3
l1
l2
s
Tightening
Torque
Nm
With Reflector
Without Reflector
9
(.35)
G 1/4
18
(.71)
10
(.39)
6
(.24)
15
(.59)

2-3

11
(.43)
G 3/8
22
(.87)
7.5
(.29)
7
(.28)
19
(.75)

3-5

14
(.55)
G 1/2
26
(1.02)
10.5
(.41)
8
(.31)
22
(.87)

4-6

20
(.79)
G 3/4
31.5
(1.24)
10.5
(.41)
9
(.35)
27
(1.06)

6-8

25
(.98)
G 1
40
(1.57)
11
(.43)
10
(.39)
34
(1.34)
8-10
30
(1.18)
G 11/4
47.5
(1.87)
11.5
(.45)
13
(.51)
40.5
(1.59)
8-10
 
 Metric Thread Table

Dimensions in:

millimeters
(inches)

Part Number
d1
window glass
d2
Thread
d3
l1
l2
s
Tightening
Torque
Nm
With Reflector
Without Reflector
11
(.43)
M16 x 1.5
22
(.87)
8
(.31)
7
(.28)
19
(.75)

2-3

14
(.55)
M20 x 1.5
26
(1.02)
9.5
(.37)
8
(.31)
22
(.87)

8-10

18
(.71)
M25 x 1.5
31.5
(1.24)
8
(.31)
9
(.35)
27
(1.06)

8-10

18
(.71)
M26 x 1.5
31.5
(1.24)
13
(.51)
9
(.35)
27
(1.06)

8-10

20
(.79)
M27 x 1.5
31.5
(1.24)
9
(.35)
9
(.35)
27
(1.06)

8-10

22
(.87)
M30 x 1.5
35
(1.38)
9
(.35)
10
(.39)
30
(1.18)

8-10

25
(.98)
M35 x 1.5
40
(1.57)
11
(.43)
10
(.39)
34
(1.34)
8-10
30
(1.18)
M40 x 1.5
47.5
(1.87)
11.5
(.45)
13
(.51)
40.5
(1.59)
8-10
 
 SAE Thread Table

Dimensions in:

inches
(millimeters)

Part Number
d1
window glass
d2
Thread
d3
l1
l2
s
With Reflector
Without Reflector
.51
(13)
3/4-16 UNF-2A
1.02
(26)
.59
(15)
.31
(8)
.86
(22)
.75
(19)
1 1/16-12 UNF-2A
1.38
(35)
.59
(15)
.39
(10)
1.18
(30)