 |
|
| U-TUBES
MANOMETERS |
| Primary
low pressure standards |
| |
| |
|
| |
| |
U-tube manometers for relative and absolute pressures,
vacuum and differential pressures.
These devices are primary standards and are void of
faults within their physical tolerances. They are
designed to measure pressure and are suitable for
calibrating high precision pressure sensors. |
| |
|
| |
|
|
|
| Applications |
|
|
|
- Very low maintenance cost. No need for
recalibration
- No electronic parts. Can be used anywhere
- Traceable calibration certificate
- Ideal for calibration of transmitters in
clean-room applications
- Differential pressure for flow applications
- Baroscope for absolute pressure in metrology
laboratories and aerospace applications
- Calibration of handheld instruments used in HVAC
applications
|
|
|
|
|
|
|
|
| |
|
|
Basic
knowledge
|
|
|
U-tube
manometers of this type are primary standards. The
measuring principle of these liquid manometers is based
on the following relationship:
dp=dh x pm x g
The pressure (p) to be measured is to be compared with
the height (h) of a liquid column. If the pressure
exerted on the two surfaces of the so-called confined
liquid is not the same, there is a deflection and
consequently a difference in height. The confined liquid
continues to rise until the effect of the force of the
pressure differentials and the weight of the liquid
columns are identical. In accordance with the laws of
physics, the effect of the liquid column on the pressure
in the liquid is, in essence, only dependent on height
(h) of the liquid column and on density (rm) of the
liquid. Further influences are relatively low and known.
For highly precise measurements, correction calculations
can be made. Recalibration is not necessary. |
|
|
|
|
|
|
|
|
|
| Principle
of MINISCOPE |
|
|
|
MINISCOPE
testers are U-tube manometers of a special design. In
these devices both legs are "inserted in each
other". The filling medium is normal tap water. A
hollow body of special steel floats on the surface of
the water in the inner leg. The glass scale is attached
to the latter, which is read via an eyepiece on the
integrated optic system. Pressure changes of as little
as 1/1000 mbar (0.000014 psi) can be read by means of a
reticule and a micrometer drum, which can be precisely
adjusted. In addition, a projection device featuring a
ground-glass disc instead of the eyepiece is offered as
an optional extra.
|
|
|
|
|
|
|
|
| |
| |
| |
|
|
MINISCOPE
manometers
|
|
|
|
| |
|
|
|
| Ideal
for pressure and differential pressures with a
resolution of better than 0.002 mbar. The model MIN 20
has a measuring range from 0 to 20 mbar (0.29 psi). The
model MIN 50 has a range of 0 to 50 mbar (0.71 psi).
Both models are designed for extremely low differential
pressures that can be measured at static pressures up to
600 mbar (8.5 psi). MINISCOPE manometers are
reproducible primary standards and do not require
recalibration. They are very easy to operate and
maintain. They feature a total uncertainty of only ±0.005
mbar. Generation of a stable and precise test pressure
is made easy by the special and very large actively
stressed pressure surface design inside the MINISCOPE
manometer. They are inherently temperature stable due to
their large mass. MINISCOPE manometers are ideal for
pharmaceutical and semiconductor industries for
calibration of monitoring sensors in clean-room
applications; equipment for standards authorities and
for flow measurements using the differential pressure
method in air-conditioning and ventilation industries,
cement industries and others |
|
Clik to enlarge
|
|
|
|
|
|
| |
| |
| |
|
|
MANOSCOPE
and BAROSCOPE manometers
|
|
|
|
| |
|
|
|
| Ideal
for pressure measurements of low differentials at high
static pressures. MANOSCOPE manometers are operated by
means of water or mercury as confined liquids. The
negative leg is made of special pressure-proof glass.
This design enables you to adjust the reading device to
the meniscus of the confined liquid. Accurate
positioning and parallactic-free reading of the vernier
is possible by means of the slide design. They feature a
range up to 2.1 bar (30 psi) and a resolution better
than 0.2 mbar. The uncertainty is typically ±0.4 mbar.
BAROSCOPE manometers operate in the same way as the
MANOSCOPE models. However, these models are used as a
high precision absolute pressure gauge in the barometric
field. They feature ranges up to 1,100 mbar (15.6 psi)
or 2,000 mbar (28.4 psi) with the same specification as
for the MANOSCOPE. |
|
Clik to enlarge
|
|
|
|
|
|
|
|
|
|
