GOK GWD, Assembly And Operating Manual

Page: 21 / 72

Limit indikator GWG type GWD
Part no. 15 382 56 b 9 / 12
Table 7: Example for calculating the adjusting dimension X
Length = 1010mm Width = 1010mm Height H = 1010mm b = 5mm,
Rated volume of the tank = 1000L Bushing with k = 30mm GWG with Z =
305mm
1.
Q
max
pursuant to DIN 4755 and DWA-A 791
1200L/min
2. Total time t
ges
pursuant to EN 13616 5.5s
3. Overrun volume V
3
V
1
= 1200L/min; (5.5s • min / 60s) 110L
V
2
for D
i
= 55mm and L
FL
= 15m 35L
V
4
= V
1
+ V
2
= 110L + 35L
145L
4. Response height L
1
and adjusting dimension X
V
3
= 95% (
V/V
) of 1000L
950L
V
5
= V
3
- V
4
= 950 - 145 805L
a) Look up volume V
5
in calibration chart and find the level L
1
_ _ _ _ mm
b) Approach: L
1
+ a - b = H - (2 • b) = 1000mm
1000L ≡ 1000mm at 100% (V/V), 805L ≡ L
1
[mm]
c) from a) or b): L
1
= 805mm
d) Adjusting dimension GWG
X = H - L
1
- b + k = 1010 - 805 - 5 + 30 230mm
e) Control dimension GWG Y = Z - X = 305 - 230
75mm
LIMIT INDICATOR REPLACEMENT (OLDER TANKS)
From DIBt information issue 1/2008
When replacing limit indicators on tanks with test certificates or general approvals of the
building inspectorate, the following limit indicator with the certificate of suitability for intended
use of the building inspectorate may be installed:
• limit indicators fitting into the designated connection on the tank,
•
limit indicators having such a length allowing for the hitherto adjusting dimension to be re-
configurable and for reading off the related control dimension.