Pressure Measurement
31
IM 767361-01E
Connect to the input port. When making connections to models with the -P1
and -P2 suffixes, be sure to wind the seal tape tightly around the connector to
prevent leakage. When using a -P3 model, attach the VCO body included with
the unit. Clean any dirt that may be on the input port and o-ring before attaching
it.
The connector must be tightened to the input port firmly to prevent leakage.
Do not only tighten the connector, since damage to the internal pipes of the
instrument may result. Instead, use two wrenches. Place one at the cut-out on
the input port and the other on the connector, then tighten the connector to the
input port.
There are two input ports on both the front and rear panels. However it is not
possible to connect pressure inputs to both ports at the same time. Make sure
that the port which is not being used is properly blocked with a plug.
Tube
Nut
Sleeve
Connector
Input port
Note
• Only non-flammable, non-explosive, non-toxic, and non-corrosive gases or liquids may be
measured.
• Affix the seal (included with the unit) near the input port. The seal must state the nature of the
fluid to be measured.
• Connect the fluid tube properly so that no gas or liquid leakage occurs.
• Switching the fluid to be measured from gas to liquid or vice versa may cause a measurement
error. It is recommended that use of the instrument be limited to either gas or liquid only.
Should the fluid to be measured be changed, open the plug to discharge the fluid remaining in
the tubes and instrument completely, then fill them with the fluid to be measured and perform
pressure measurement.
• If cleaning of the inside of the instrument is necessary, contact your nearest YOKOGAWA
representative as listed on the back cover of this manual.
When Using the 1 kPa Model (767370), or the 10 kPa Model (7673 1)
With 1 kPa and 10 kPa models, zero point hysteresis occurs when the
measurement mode is switched between positive pressure and negative
pressure modes.
To avoid the hysteresis, after inputting full-scale pressure, open the input port to
the atmosphere, then perform zero calibration before starting measurement.
We recommend the same operation be performed to improve measurement
accuracy when measurements are made in both positive or negative pressure
ranges.
Pressure Measurement
