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When not used for prolonged times, the pressure transducer can exhibit some drift during the
initial start up operation. To avoid this problem, it is recommended that after switching the unit
on, the transducer undergo several pressurization/depressurization cycles prior to making an
actual density measurement (or calibration).
Pressure Relief Valve (Internal)
A 25 psig (~172 kPa) pressure relief valve is located inside the unit immediately after the gas
input fitting (See Figure 1). It is designed to prevent damage to the pressure transducer due to
overpressurization. Gas cylinder regulator output pressures over 25 psig (~172 kPa) will activate
the valve to vent excess gas pressure, in which case a hissing sound may be heard, and will
prematurely empty your cylinder. Therefore the cylinder regulator should be set at only slightly
more than 20 psig (138 kPa).
Calibration Status
The MULTIPYCNOMETER was calibrated at the factory and should only require recalibration
after a sample cell or adapter sleeve has been replaced (for example if lost or damaged), after
service or component replacement, if its new environmental temperature is outside the range 21-
25°C, when required by your local regulations, and is recommended when the environmental
temperature has changed by more than 4°C since the last calibration.
RS232 Port
Models with the D160E designation have an RS232 connection port on the left side of the unit,
and are supplied with an RS232 cable and a software program (“PycData”) on a CD which also
contains an electronic copy of its own User Manual. PycData reads the pressure display and can
perform all required calculations.
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