Brooks Instrument 5882/92 - Manual (Page 19)

19
Installation and Operation Manual
X-TMF-FM-MFC-eng
PN 541-C-007-AAG
April, 2008
Flomega, Liquid MFC’s/MFM’s
MODEL 5882/92 (see figure 3-5)
ELECTRONIC FEATURES
The Flomega model 5882 liquid mass flow controller and model 5892 liquid mass flow meter has a number
of features which are customer selectable (by jumper setting) or adjustable (by potentiometer). These are:
a. Voltage or current setpoint
This is jumper selectable. For 0-5 Vdc setpoint insert jumper J5 to position 2-3 and jumper J7 to
position 2-4. For 0-20 mA setpoint insert jumper J5 to position 2-3 and jumper J7 to position 2-3.
For 4-20 mA setpoint insert jumper J5 to position 1 1-2 1-2 and jumper J7 to position 1-2.
b. 0-20 mA or 4-20 mA output
This is jumper selectable. For 0-20 mA output insert the jumpers J6 and J7 to position “X” and jumper
J8 to position “0”. For 4-20 mA output insert jumpers J6 and J7 to position “0” and jumper J8 to position
“X”. 0-5 Vdc output is always available.
c. Soft start
To enable soft start feature insert jumper J6 to position 2-3
d. Artificial zero
To enable this feature insert jumper J14 to position 1-2. When flow signal is less than 1%, output is
command to zero, i.e. 0 V and 0 mA or 4 mA.
e. Output damping
The output can be dampened out by adjusting potentiometer P8. It can be adjusted between a RC-time
of 0.1 sec. to 10 sec.
f. Proportional gain
By adjusting potentiometer P4, the proportional gain can be changed. This will enable you
to optimize your response.
g. Valve Over Ride
When applying -15 Vdc to 0 Vdc on pin number 12 of the connector, the valve is
commanded to the closed position independent of the setpoint.When applying +5 Vdc to +15 Vdc on
the same pin, the valve is commanded to the fully open position independent of the setpoint.
Note:
Excessive high flowrates, around
≥≥≥≥≥
200% full scale setting, may produce a decreasing output signal. The
output signal is limited up to 6.8 Vdc and 24 mA.
h. Temperature heater output
On pin no. 6 of the connector, the output voltage can be monitored which reflects the
temperature of the heat source. This can be used for monitoring or alarm purposes in case liquids are
used which are limited regarding the warm-up temperature.
Note:
The electronics are executed with a temperature limiter for the heater. When this temperature is reached,
the heating circuitry is switched off.
Section 3 Theory of Operation