Instruction Manual
DG04
Flow Sight Class
for Installation between two Flanges
PKP Prozessmesstechnik GmbH
Borsigstraße 24
D-65205 Wiesbaden-Nordenstadt
Tel.: ++49-(0)6122-7055-0
Fax: ++49-(0)6122-7055-50
Email: info@pkp.de
Table of Contents
Safety Information..................................................................................................................2
Assembly instructions and tightening torques.......................................................................3
Maintenance and care...........................................................................................................3
Safety Information
General Instructions
To ensure safe operation, the device should only be operated according to the specifica tions in the instruction manual. The requisite Health & Safety regulations for a given
application must also be observed. This statement also applies to the use of accessories.
Every person who is commissioned with the initiation or operation of this device must have
read and understood the operating instructions and in particular the safety instructions!
The liability of the manufacturer expires in the event of damage due to improper use, nonobservance of this operating manual, use of insufficiently qualified personnel and unauthorized modification of the device.
Proper Usage
The sight class of the DG04 series are used for the optical control monitoring of liquids.
Any other use of the device is prohibited and outside the scope of application.
In particular, applications in which shock loads occur (for example, pulsed operation)
should be discussed and checked in advance with our technical staff.
The devices of the DG04 series should not be used as sole monitoring devices in order to
detect or even avoid dangerous operating states in plants and machines. The plant or
machine itself must be planned and constructed in such a way that critical conditions
which pose a danger to man and the environment are excluded from the outset
Dangerous substances
For dangerous media such as e.g. Oxygen, Acetylene, flammable or toxic substances as
well as refrigeration systems, compressors, etc. must comply with the relevant regulations
beyond the general rules.
Qualified Personnel
The devices of the DG04 may only be installed by trained, qualified personnel who are
able to mount the devices correctly. Qualified personnel are persons, who are familiar with
assembling, installation, placing in service and operating these devices and who are suit ably trained and qualified.
DG04 Instruction manual 04/2019 page 2
Inward Monitoring
Please check directly after delivery the device for any transport damages and deficiencies.
Additional with reference to the accompanying delivery note the number of parts must be
checked.
Claims for replacement or goods which relate to transport damage can only be considered
valid if the delivery company is notified without delay.
Assembly instructions and tightening torques
Attention:
• Tighten flange screws evenly.
• Avoid shock loads.
• Mount flat gaskets and sight glass centred.
Nominal size DN 25 40 50 80 100 125 150 200 250 300
max. tightening torque
(Nm)*
12 21 28 20 26 32 47 63 63 63
*for lubricated torques µ = 0,1
Maintenance and care
The sight glasses are insensitive to contamination, as the inner surface is flushed by the
flowing medium.
The sight glasses have no dead spaces, so that the sight glass can be flushed or cleaned
together with the pipeline when changing the product.
DG04 Instruction manual 04/2019 page 3
Flow Measurement and Monitoring
DG04
Flow Sight Glass for
Installation between Two Flanges
• for liquids and gases
• 360° all round visibility
• easy installation between two DIN-
or ANSI-flanges
• design in borosilicate glass for
aggressive media, until 300 °C
media temperature
• quartz glass-design for mediatemperatures until 1100 °C
• insensitive to contamination
• maximum pressure 16 bar
Description:
Model series DG04 sight glasses are distinguished by their
rugged construction and wide range of applications. They feature 30, 50 or 100 mm long transparent cylinders made of
acrylic, soda-lime or borosilicate glass with very high wall
thickness. These cylinders are intended to be clamped
between two existing flanges. Their dimensions match those
of the sealing face on the raised area of the flange. This sizing
makes support from a separate metal housing unnecessary.
In addition, this design allows the flow to be viewed and
monitored from any direction. The flange screws provide addi-
tional protection against mechanical damage.
The sight glass has no dead spaces, so that it can be
flushed / cleaned together with the pipeline when changing
products.
There are no deposits in the sight glass when the pipeline is
drained, because the inner diameter of the sight glass corresponds to the inner diameter of the pipeline. The DG04 are
therefore also ideally suited for sterile and antiseptide applications.
Typical applications:
The flange bolts also offer additional protection against mech anical damage. The borosilicate glass version can be installed
in devices used with very caustic / corrosive liquids. They are
insensitive to contamination because the inner surface is constantly being rinsed by the flowing liquid.
In particular, the larger nominal sizes are very cost effective
solutions since they only require the transparent cylinder and
no metal housing with flanges.
PKP Prozessmesstechnik GmbH
Borsigstr. 24 • D-65205 Wiesbaden
S +49 (0) 6122-7055-0 • T +49 (0) 6122 7055-50
info@pkp.de • www.pkp.de
PKP Process Instruments Inc.
10 Brent Drive • Hudson, MA 01749
S +1-978-212-0006 • T +1-978-568-0060
info@pkp-usa.com • www.pkp-usa.com
180723
Models:
DG 04.A: material: acrylic
max. temperature: +80 °C
max. pressure: 16 bar
DG 04.B: material: borosilicate glass
max. temperature: -200...+300 °C
max. pressure: 16 bar
for aggressive medias and high temperatures
DG 04.Q: material: quartz glass-
max. temperature: +1100 °C
max. pressure: 16 bar
for aggressive medias and very high temperatures
Assembly / Mounting:
Dimensions:
Nominal
sizes
DG04 for
DIN-flanges
diameters
[mm]
DG04 for
ANSI-flanges
diameter
[mm]
Permitted
process
pressure [bar]
with 150 °C and
borosilicate glass
outside inside outside inside
DN 10
DN 15
DN 20
DN 25
DN 32
DN 40
DN 50
DN 65
DN 80
DN 100
DN 125
DN 150
DN 200
DN 250
40
45
58
68
79
88
102
122
138
158
188
212
268
320
14
18
23
29
38
44
55
71
83
108
132
160
208
261
40
35
43
50
63
73
92
105
127
157
186
216
270
324
14
16
21
27
35
41
53
63
78
102
128
154
203
255
16
16
16
16
16
16
16
16
16
16
16
16
16
10
Larger nominal sizes and higher pressures on request.
Order Code:
Order number: DG04.
Flow sight glass for installation
between two flanges
A. 50. D. 025. 0
Models:
A = acrylic
B = borosilicate glass
Q = quartz glass
Length:
030 = 30 mm (DG04.B only)
050 = 50 mm
100 = 100 mm (DG04.A only)
Connection:
D = flange, max. PN 16
A = ANSI-flange, max. 150 lbs.
Nominal size:
010...250 = nominal size appropriate table „Dimensions“
Options:
0 = without
1 = please specify in plain text
Advice:
The flanges, screws and gaskets are not included
in the delivery.
Weights:
Nominal
sizes
DG04 for
DIN-flanges weight
[Kg]
DG04 for
ANSI-flanges weight
[Kg]
Borosilicate
glass
Acrylic Borosilicate
glass
Acrylic
L
[mm]
30
L
[mm]
50
L
[mm]
50
L
[mm]
100
L
[mm]
30
L
[mm]
50
L
[mm]
50
L
[mm]
100
DN 10
DN 15
DN 20
DN 25
DN 32
DN 40
DN 50
DN 65
DN 80
DN 100
DN 125
DN 150
DN 200
DN 250
0,08
0,1
0,16
0,22
0,28
0,33
0,42
0,56
0,7
0,76
1,03
1,11
1,64
1,97
0,13
0,16
0,27
0,36
0,46
0,56
0,71
0,94
1,16
1,27
1,71
1,85
2,73
3,28
0,07
0,08
0,14
0,18
0,23
0,28
0,36
0,47
0,59
0,64
0,86
0,93
1,38
1,65
0,14
0,16
0,27
0,36
0,46
0,56
0,71
0,95
1,17
1,28
1,73
1,87
2,75
3,31
0,06
0,08
0,1
0,16
0,21
0,32
0,4
0,58
0,82
1,05
1,32
1,82
2,29
-
0,09
0,13
0,17
0,26
0,35
0,54
0,67
0,96
1,36
1,74
2,19
3,03
3,82
-
0,05
0,07
0,09
0,13
0,18
0,27
0,34
0,48
0,69
0,88
1,11
1,53
1,93
-
0,09
0,14
0,17
0,26
0,35
0,55
0,68
0,97
1,37
1,76
2,21
3,06
3,85
-
PKP Prozessmesstechnik GmbH
Borsigstr. 24 • D-65205 Wiesbaden
S +49 (0) 6122-7055-0 • T +49 (0) 6122 7055-50
info@pkp.de • www.pkp.de
PKP Process Instruments Inc.
10 Brent Drive • Hudson, MA 01749
S +1-978-212-0006 • T +1-978-568-0060
info@pkp-usa.com • www.pkp-usa.com
Flow
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