Delta Controls D-Series TDSST - Manual (Page 3)

D-Series
Models: S-T
www.delta-controls.com
How to Order
Recommendations
The essential metrological problem with diaphragm seals operational use is an absolute thermal zero error, resulting from
the thermal expansion of the manometer liquid. The expansion effect must be compensation for by the separating
diaphragm’s flexibility.
To minimise this effect, it is advisable to:
s Use capillaries which are as short as possible in order to greatly reduce the volume of manometer liquid
s Use seals with greater diameters in order to maximise flexibility of the separating diaphragm
s Place the capillaries in locations in which the temperature fluctuations will be minimal
Example: DPC-2000 pressure transmitter, nominal measuring range 0 ÷ 25 bar, DN 50 remote flanged
seal with extended diaphragm, 100 mm tube, 2 m capillary.
DPC-2000ALW / 0 ÷ 25 bar / S-TK – DN50 / T = 100 mm / K = 2 m
Direct diaphragm seal:
pressure measuring device / S-T – DN..... / T = ..... mm / special version (description)
Remote diaphragm seal:
pressure measuring device / S-TK – DN..... / T = ..... mm / K = ..... m / special version (description)
Transmitter or gauge
– see the code in the
appropriate catalogue sheet Seal
version Tube
length Capillary
length