Humboldt HM-4160 FlexPanels - Manual (Page 10)

Group Controls— Section 1
The Selection Valve (A1) at the top of the section selects the type of
pressure input for the top of the burette assembly. It can select
VACUUM (Regulated), VENT (to atmosphere), OFF (closed) or
PRESSURE (controlled by the Regulator below it).
The Pressure Regulator (R1) supplies a regulated pressure for the burette
assembly in this section. The regulator in section 1 is different than the
regulators in sections 2 and 3. It has a bias feature, which when turned to
the Bias On (BA) setting, adds the pressure set in Section 2 to Section 1.
When the Bias is on, adjusting pressures with the Section 2 Regulator (R2),
will maintain the differences in pressure between Section 1 and 2 in direct
proportion to the original Section settings. When using the knob to adjust
the pressure it will not turn as easy as the standard type regulator.
To monitor the pressure being set on the regulator there is a Toggle Valve
(T1) directly below the regulator, which is used to connect the regulator to
a pressure read out. To check the pressure while adjusting the regulator lift
the toggle and read the pressure on the digital display located at the top
of the Master Controller. Only one pressure can be monitored at a time.
The Toggle Valve (T1) should be closed after checking the pressure.
The Burette Assembly (B1) has one port at the top, which is connected
to both the external and internal side of the burette. The bottom of the
Burette Assembly has two outlets, one connected to the external side
and one connected to the internal side of the burette. The Burette
Assembly in Section 1 comes with a 50cc burette readable to 0.1cc.
The External Valve (E1) is connected to the External Port and to the
Cell (C1) Quick-Connect. When the valve is turned to External,
water can flow from the external side of the Burette to the Cell (C1)
Quick-Connect.
The Burette Valve (V1) is connected to the burette and to the Cell (C1)
Quick-Connect. When the Valve is turned to Burette, water can flow from
the burette to the Cell (C1) Quick-Connect. The External and Burette
Valves can be opened at the same time and the water levels on both
sides of the burette should be about the same level.
R1
R2
BA
B1
C1
V1
T1
A1