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3. Theory of Operation
DynaPak 2010 Gas Sampler
The DynaPak 2010 Sampler is a pipeline mounted
system which uses the pneumatically operated,
positive displacement DynaPak 2000 pump, the
Z-65 timer/controller, the YZ filter/regulator and a
low power solenoid valve to obtain gas samples.
The 2010 provides three modes of operation:
A. Time-based sampling: in this mode of
operation, the 2010 extracts a gas sample from
the pipeline at regular time intervals. The volume
of the sample is set by the operator using the
volume adjustment feature of the DP-2000 pump.
The Z-65 controller operates as a recycling timer,
periodically energizing a low power solenoid valve.
Energizing the solenoid valve allows actuation gas
to stroke the DP-2000 pump. The rate at which
this occurs is a function of operator input. Two 10
position switches are used to set the off time
interval. The number of times the solenoid output
is activated is recorded by the onboard LCD stroke
indicator.
B. Time-based sampling with the Optional
YZ differential pressure switch (DPS-2): this
mode of operation is similar to the time-based
sampling mode, except that the DPS-2 converts a
differential pressure signal to an electrical signal
that the Z-65 timer uses to determine if flow is
present in the pipeline. In effect, the DPS allows
the Z-65 timer to shut off when flow stops in the
pipeline, and when flow starts again, the ability to
start-up and resume operation.
C. Proportional-to-flow sampling:
in this mode of operation, the Z-65 counter
operates as a dividing counter. The Z-65 counter
periodically energizes a low power solenoid valve.
As in the other two modes of operation, this allows
actuation gas to stroke the DP-2000 pump. The
rate at which this occurs is a function of operator
input as well as the host computer or other device
that inputs pulses per volume metered. The two
10-position switches on the Z-65 are used to set
the number of pulses the counter will count before
activating the solenoid output. The number of
times the solenoid output is activated is recorded
by the onboard LCD stroke indicator. Sample
volume is again controlled using the DP-2000
volume adjustment knob.
In all three modes of operation, the Z-65 timer/
counter operates using a replaceable internal
battery pack. The battery pack condition is
monitored by way of two indicator LEDs. When
the battery pack needs replacement, the red LED
will illuminate when the solenoid output is
activated. If the battery pack is good, the green
LED will illuminate when the solenoid is activated.
The External Power Option can be used in lieu
of the internal battery pack. The External Power
Option (model # EPO-120) consists of an AC to
DC convertor and intrinsically safe barrier to
convert 120 VAC power to 28 VDC to operate the
controller without the use of the internal battery
pack.
The Solar Power Option would be used in lieu of
the internal battery pack. The Solar Power
Option (model #SPO-12) consists of a 5 watt
solar panel with RM-12 charger regulator module
and internal 12V, 5 Amp hour battery pack.
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