SMAR DT302, Owner'S Operation And Maintenance Manual

Page: 69 / 84

Section 5
5.1
TECHNICAL CHARACTERISTICS
Filling Fluids
The filling fluid selection shall take into account its physical properties in what concerns to pressure
temperature limits and chemical compatibility with the process fluid. The latter is an important
consideration in case the filling fluid happens to come in contact with the process fluid, should a
leakage occur.
Table 5.1 presents the filling fluids, which are available for the
DT302 , together with physical
properties and applications.
FILLING
FLUID
VISCOSITY
(cSt) at 25ºC
DENSITY
(g/cm
3
at
25ºC)
THERMAL
EXPANSION
COEFICIENT
(1/ºC)
APPLICATIONS
Silicone
DC 200/20
20 0.95 0.00107 General purpose – Standard
Silicone
DC 704
39 1.07 0.000799 General purpose – (high temperature and vacuum)
Sytherm 800
10 0.934 0.0009 General Purpose (extreme temperatures, positive and negative)
Propylene Glycol
(Neobee M20)
Food Grade
9.8 0.90 0.001 Beverage and pharmaceutical food grade
Glycerin and
Water
Food Grade
12.5 1.13 0.00034 Food grade
Table 5.1 - Properties of Filling Fluids
Functional Specifications
Output Signal
Digital, only. Foundation
TM
Fieldbus, 31.25 kbit/s, voltage mode with bus power.
Power Supply
Bus powered: 9 - 32 Vdc.
Quiescent current consumption: 12 mA.
Indicator
4 ½ -digit numerical and 5-character alphanumerical LCD indicator.
Hazardous Area Certifications
Explosion, weather and intrinsically safe proof. Certified by CEPEL, FM, Dekra/EXAM and NEMKO.
Other Certification
3A standard.
Temperature Limits
Ambient: -40 to 85º C ( -40 to 185º F)
Process: -20 to 150º C ( -04 to 302º F)
Storage: -40 to 100º C ( -40 to 212º F)
Digital Display: -10 to 60º C ( 14 to 140º F)
Static Pressure Limit
70 kgf/cm
2
(7 MPa) (1015 PSI).
Turn-on Time
Approximately 5 seconds.
Volumetric Displacement
Less than 0.15 cm
3
(0.01 in
3
)