Vaisala DPT145, Руководство пользователя

Страница: 21 / 63

Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 21
CHAPTER 4
INSTALLATION
This chapter provides you with information that is intended to help
you install the DPT145.
Transmitter Configuration Before Installation
Depending on your application, you may need to configure some
transmitter features before physically installing it.
1. By default, DPT145 transmitters are configured for single
transmitter operation. Serial operation mode is
STOP and
address is 0 .
To configure transmitters for operation on a common line, you
must give each transmitter a unique address (range 0 ... 255)
and set their serial operation mode to POLL.
2. The default serial line settings may not be right for your RS-485
line.
3. You may need to change the transmitter’s settings for the
measured gas. You can configure the mixing ratio of SF
6
, and
the molar weight of the other gas.
An easy way to configure the measured gas is to connect the DPT145
to the MI70 indicator using the MI70 connection cable (Vaisala order
code 219980). You can change the settings in the
Measurement
Settings menu. See Figure 5 below.
1108-039
Figure 5 DPT145 Configuration with the MI70 Indicator