17
Gilian
®
LAB & FIELD CALIBRATOR SYSTEM
Sensidyne Document No. F-PRO-1260 (Rev C)
3.3
PUMP CALIBRATIONS FOR MODELS
GILAIR-3 & 5 AND HFS-113 & 513
In these Gilian samplers the flow rate control is de-
rived by using the DC motor of the pump as the load
sensor which provides a dependable means of provid-
ing constant flow. This system requires adjusting the
slope and intercept to provide proper linearity for the
system. As such, this linearity is provided by the use
of two flow calibration points.
3.3.1
High Flow Calibrations
The Diagnostic Calibrator is set up to check electronic
calibration over the range 0.5–5.0 liters. For HFS-513,
GilAir/GilAir-5 and HFS-113 samplers, please refer to
their respective operation manuals for specific calibra-
tion ranges and adjustment procedures.
This procedure properly calibrates the electronic flow
control system in the pump. Calibrating high flow rates
requires adjusting the flow control compensation po-
tentiometers of the Back-pressure Compensation Sys-
tem (BCS) in the pumps.
These potentiometers are adjusted at 2 flow rate points:
•
at 1 LPM for HFS-113 & GilAir (1.5 LPM for
HFS-513)
•
at 3 LPM for HFS-113 & GilAir (4 LPM for HFS-
513)
*)
In this mode, turn the Flowmeter Selector Valve
(V2) to the appropriate flowtube. Connect the
pump tubing to the Air Inlet Fitting (B1).
*)
Set the Load Selector Valve (V1) to “Bypass” (refer
to Figure XX).
*)
Turn on the pump and adjust the flow rate to either
1 or 1.5 LPM (depending on your pump model).
*)
Turn the Load Selector Valve (V1) to “Low Flow
Adjust” (V4) (refer to Figure XX) to simulate the ap-
propriate back pressure on the pressure gauge. Ad-
just the Low Flow Adjust Valve (V4), as needed, to
maintain a constant flow rate when switching be-
tween “Bypass” and “Low Flow Adjust” modes.
*)
Adjust the pump flow rate to either 3 or 4 LPM (de-
pending on your pump model).
*)
Turn the Load Selector Valve (V1) to “High Flow
Adjust” (V3) (refer to Figure XX) and adjust until
proper back pressure is observed.
*)
Note any changes in the flow rate. Adjust the high
flow pump compensation potentiometer so as to
maintain a constant flow rate when switching be-
tween the “Bypass” and “High Flow Adjust” modes.
