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Nominal diameter (DN), nominal pressure (PN) and permissible flow rates q for rotary-piston meters and automatic batchmeters |
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Version |
DN |
PN |
Rated flow |
Permissible flow rate |
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With |
Min.1) in continuous operation2) |
Max. in intermittent operation3)4) |
Max. in |
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mm |
(inch) |
bar |
(psi) |
l/min |
(USgpm) |
mPa·s (cp) |
l/min |
(USgpm) |
l/min |
(USgpm) |
l/min |
(USgpm) |
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|
Rotary-piston meters for industrial use |
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 |
15 5) |
( )5) |
25 |
(363) |
20 |
(5.3) |
1 |
1,5 |
(0.26) |
10 6) |
(5.3) |
10 |
(2.6) |
|
25 |
(1) |
10 |
(145) |
100 |
(26.4) |
0,3 |
12 |
(3.2) |
100 |
(26) |
80 |
(13) |
|
|
50 |
(2) |
6 |
(87) |
500 |
(132) |
0,3 |
40 |
(11) |
500 |
(106) |
350 |
(44) |
|
|
80 |
(3) |
68) |
(58) |
1000 |
(264) |
0,3 |
60 |
(16) |
1000 |
(211) |
700 |
(93) |
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|
Rotary-piston meter of acid-resistant design |
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25 |
(1) |
10 |
(145) |
100 |
(26.4) |
0,6 |
10 |
(2.6) |
100 |
(26) |
50 |
(13) |
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Automatic batchmeter (rotary-piston meter with quantity preset register and mechanical shut-off valve) |
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25 |
(1) |
10 |
(145) |
100 |
(26.4) |
0,3 |
12 |
(3.2) |
100 |
(26) |
– |
– |
|
50 |
(2) |
6 |
(87) |
500 |
132 |
0,3 |
40 |
(11) |
500 |
(106) |
– |
– |
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1) For metal rotary-pistons: increase by a factor of 2, for PCTFE and PTFE/graphite filling rotary-pistons: increase by a factor of 3.
2) Continuous operation: over 8 hours a day.
3) For metal pistons: Reduce by a factor 0.8 to extend service life
4) Intermittent operation: up to 8 hours a day
5) Note: When using pistons made of carbon, there is higher risk of breakage in case of liquid hammers
6) When using pistons made of carbon
7) Flow rates for higher viscosities on request; we have experience with ranges up to 350000 mPa s (cp)
8) Values in brackets apply to casing made of CrNiMo steel
9) Max. permissible viscosity for exact closing of the shut-off valve and for exact dispensing; viscosities up to around 4000 mPa s (cp) possible
Note:
In order to extend the service life of the pulse sensor, rotary-piston meters with current and/or pulse output (without intermediate gear) should only be operated at max. 60 % of the permissible flow.
Piston materials
|
Piston material |
Version |
Permissible liquid temperature |
Max. perm. dyn. viscosity |
Order No. code |
|
|---|---|---|---|---|---|
|
°C |
°F |
mPa·s (cp) |
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Carbon |
-10 ... 300 |
14 ... 572 |
25 |
K |
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Cast iron (mat. No. GG 25) |
|
-10 ... 300 |
14 ... 572 |
E |
|
|
Ni-Resist (mat. No. 0.6660) |
|
-10 ... 300 |
14 ... 572 |
N |
|
|
Hard rubber |
|
-10 ... 401) |
14 ... 1041) |
50 |
G |
|
PTFE/graphite filling |
|
0 ... 402) |
32 ... 1042) |
120 |
F |
|
PCTFE |
|
-10 ... +402) |
14 ... 1042) |
120 |
H |
|
CrNi steel with carbon contact surface (only DN 25 (1“)) |
Collar piston |
-10 ... +200 |
14 ... 392 |
> 10 |
S |
1) For 120 min max. 65 °C (149 °F); for 20 min max. 90 °C (194 °F), e.g. for cleaning purposes
2) Error limit max. 1 %, at 90°C (194 °F) max. 2 %.
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Other technical specifications |
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|---|---|
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Materials and max. permissible liquid temperatures |
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Housing (also lining with acid-resistant meters) and measuring chamber |
Temperature range |
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-30 ... +300 °C (-22 ... +572 °F) |
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-20 ... +80 °C (-4 ... +176 °F) |
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Error limits |
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|
Error limits |
Between 0.2 % and 0.5 % of the correct value (depending on the metered fluid, the measuring range and the relevant calibration regulations), except for rotary-piston meters DN 15 ( “) and acid-resistant meters with PCTFE pistons; where 1 % of the actual value applies. |
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Reproducibility |
Within 0.05 % |
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Controllability |
In steps from 0.01 % |
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Rated loss |
Max. permissible 3 bar (43.5 psi), max. 0.5 bar (7.25 psi) for acid resistant meters |
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Transmission from wet to dry space |
Gland-free, using permanent magnet coupling |
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Installation position (axis of meter mechanism) |
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|
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Any |
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Vertical |
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|
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Any |
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Meter axis vertical |
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Special inlet and outlet pipe sections |
Not necessary |
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Pipe connection |
Flange drilled to EN 1092-01 |
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Filter size (mesh width) |
0.8 mm (0.031 inch) for rotary-piston meters |
Notes
The material combinations which can be supplied are listed in the Ordering data.
The maximum permissible liquid temperature is determined by the “weakest link” in the particular combination (the PCTFE rotary-piston or the gasket, for example, in a meter made of CrNiMo steel).
Automatic batchmeter
With this meter, the maximum permissible liquid temperature is also limited by the operation and design of the shut-off valve.
The following are permissible for valves with maintenance free
- Gland seal: -10 ... +200 °C (14 ... 392 °F)
- Bellows seal: -10 ... + 40 °C, max. 3 bar (14 ... 104 °F, max. 43.5 psi)
Models for higher liquid temperatures on request. The installation of cooling attachments also necessitates a corresponding increase in length of the mechanical shut-off valve.
The following restriction applies to the automatic batchmeters because of the higher flow resistance through the associated shut-off valve:
- With the same value q, p is increased by approx. 30 %
- With the same p, q is reduced by approx. 20 %
If the dynamic viscosity is greater than 60 mPa s (cp), constructional details of the shut-off valve cone must be changed.
Also, no filter is installed if the dynamic viscosity exceeds 800 mPa s (cp).