Vaisala CARBOCAP MGP260 Serie Installations- Und Sicherheitshinweise Seite 16

CAUTION!
the valve specifications. The correct thread type in which to install MGP260
probes is 1.5" female NPT. Installing into any other thread type can damage the
equipment and compromise the leak tightness of the connection. If unsure,
verify the thread type with a 1.5" NPT thread gauge.
CAUTION!
to receive accurate measurements. For pressure input options, see
compensation input options (page
Recommended installation position on pipeline
Figure 3 (page 12) shows the recommended installation position for MGP260. Install the
probe in a straight run of pipeline, ≥ 5 pipe diameters downstream of the closest bend or other
feature affecting gas flow, and ≥ 2 pipe diameters upstream to the next bend or similar feature.
For best results, use the orientation and installation depth shown in
Figure 3 Recommended MGP260 installation position on pipeline
1 Recommended MGP260 probe installation position on pipeline.
Pressure compensation input options
Accurate measurement readings require compensating for the pressure of the measured
process. MGP260 series probes do not measure pressure, meaning that it is mandatory to set
up a pressure compensation input source. The following pressure input options are available:
• Pressure measurement received from an external pressure measurement instrument
through the Ex ia (4 ... 20 mA) input terminals on the MGP260 component board. This is
the recommended option: for an example, see
external pressure instrument input is shown in
Note that the Ex ia input of the MGP260 series probes is internally powered
and isolated. Compatible Ex ia pressure instruments can be directly
connected to the input terminal.
• Pressure measurement received from a Modbus master through a serial line connection.
12
Make sure the installation valve and threads are appropriate from
Note that the pressure compensation input must be set up in order
ø
≥
5
12).
≥
2
1
Figure 2 (page 11). The wiring of the
Wiring diagram (page
Pressure
Figure 2 (page 11).
ø
18).
M212481EN-B