Flowserve StarPac II Control Valves - Manual (Page 32)

F
K
coefficient (=K/1.4) register 70345
Molecular Weight register 70347
Specific Gravity Reference temp in ºR register 70349
Specific Gravity at reference temp register 70351
Viscosity A register 70541
Viscosity B register 70543
The Antoine coefficients are used to calculate the vapor
pressure of the fluid at the temperature measured by the K
thermocouple in the StarPac according to the following equation:
VP A
B
T C
= −
+
exp( )
where VP is the vapor pressure in psia, T is the temperature in
°R, and A, B, and C are the Antoine coefficients.
Viscosity is calculated according to the following equation:
( )
Visc A B T = * * exp
Where Visc is the fluid viscosity in centipoise, T is the process
temperature measured by the thermocouple in
°F, and A and B
are the viscosity coefficients.
These registers can be checked using either the View option of the
S
TATUS menu or the View selection in the Tech option of the
C ONFIGURE menu. They can be changed using the Edit selection in
the Tech option of the C ONFIGURE menu.
Setting the Jumpers
The StarPac II system has several jumpers that are used to
configure the digital and discrete I/O. Two jumpers are on the
personality card (the small card in the lower right-hand side) and are
visible when the inner door is opened. The personality card must be
removed to change the discrete jumpers located on the board below
the personality card. To remove the personality card, remove the
four small screws that hold the card in place and gently remove it by
gripping the notch at the lower right-hand corner of the card.
RS- 485 Termination - On the personality card there are two
termination jumpers for the COMM A and B for the RS-485
communications. These jumpers should only be installed on the two
most remote devices on the network. Count the host computer as
any other device. For example, a single StarPac II system is
communicating with a host PC in the control room. The StarPac II
unit and the RS-485 driver in the host computer would each require
a termination jumper. Remove the termination jumpers in the
devices not considered to be the most remote. Using more than two
termination jumpers in a network may cause the RS-485
communications to fail.
Alarm Relay Setting - Under the personality card is a three position
jumper labeled “Relay.” This jumper, if set in the A-B position,
configures the relay to Normally-open operation. If set to the B-C
StarPac II User Interface Manual 26