Azbil ALTJ 9000 Series, Руководство пользователя, Страница: 16 / 68

2-2
Chapter 2 Function and Configuration
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Configuration
y
Probe
The probe, which consists of a pressure-receiving section and a transmission section, is
installed underwater. The water pressure is transmitted to a semiconductor pressure sensor
through a metallic diaphragm and sealed liquid. The transmission section processes the
output of the semiconductor pressure sensor. It converts the output to a 4–20 mA DC
signal in proportion to the liquid level, and then outputs the converted signal. The probe is
equipped with a lightning arrestor as standard equipment. Additionally, an approximately
6 kg weight and chain can be mounted easily as optional specifications.
y
Junction Box
The junction box is installed above ground and connects to the hollow cable from the
probe and to the cable from the power supply. The reference pressure side of the semicon-
ductor pressure sensor is open to the atmosphere through the pipe of the hollow cable and
the hole in the rear panel of the junction box. The output can be indicated using an analog
meter. The junction box is also equipped with a lightning arrestor as standard equipment.
Junction box Probe (with weight) Probe
Fig. 2-2. External view of junction box and probe
Probe
(with rubber diaphragm)