VICI 230 Dynacalibrator - Manual (Page 13)


On all units with an internal pump, the supply inlet port is internally connected
directly to the suction side of the pump. Since the output of the pump is
equipped with a particulate filter and activated-charcoal scrubbers, the supply
inlet port should normally be left unconnected, completely open, and clear of any
obstructions, except as noted below for dusty environments.
If you need to alter the carrier and/or dilution streams by adding filters, scrubbers,
dehydrators, etc., the recommended method is to connect these components
in series with the bypass loops as described on the next page. If your unit is not
equipped with bypass loops, you must consider the following before altering the
stream into the supply inlet:
• If the unit or device connected to the supply inlet port generates a gas-flow-
related pressure drop, thereby partially “starving” the pump (that is, increasing
the vacuum at the pump’s suction port), the maximum flow output capability
of the Dynacalibrator will likely be diminished.
• If the unit or device connected to the supply inlet is equipped with a supple-
mentary pump providing an altered gas flow to the Dynacalibrator pump’s
suction at a pressure greater than 0 psig, the life of the pump may be
decreased. Increasing the suction pressure of the Dynacalibrator pump
will not increase its output flow capability.
Whenever a Dynacalibrator is to be operated in an environment that has signifi-
cant concentrations of dust or other particulate matter, we recommend a VICI
Metronics Particulate Filter Assembly (PFA) connected to the supply inlet port.
The disposable filter inside the PFA has been selected for its very low pressure
drop. Use of a PFA will not diminish the output flow of the Dynacalibrator pump.
The disposable filter part number is FC.
VICI recommends that Dynacalibrators equipped with inter-
nal pumps be operated either with their SUPPLY INLET port
completely open and clear of obstructions or fitted with a
low pressure drop VICI Metronics Particulate Filter Assembly.
Carrier/Dilution Inlets
All Dynacalibrators with input configurations -1X, -3X, -4X and -5X have a carrier
inlet and/or a dilution inlet. The -1X configuration does not have an internal
pump, so a source of pressurized gas must be connected to its carrier inlet and
its dilution inlet. On the remaining three input configurations, these inlets are
part of the gas stream bypass loops, discussed in a later paragraph. However,
the bypass loops may be left disconnected, and since they are downstream from
the internal pump, external pressurized gas sources may be connected to the
dilution inlet and/or the carrier inlet. The most commonly used gas is dry air;
however, dry nitrogen or any other comparably inert gas including ambient air
may also be used.
CAUTION: Externally supplied pressurized gas sources MUST
be limited to a pressure range of 10 psig minimum to 16 psig
maximum at these inlets.
Getting Started