Vaisala DPT146 Guide de l'utilisateur télécharger pdf (Page 23)

Chapter 4 ________________________________________________________________ Installation

VAISALA ________________________________________________________________________ 21

CHAPTER 4

INSTALLATION

This chapter provides you with information that is intended to help you

install the DPT146.

Transmitter Configuration Before Installation

You may wish to configure your transmitter before physically installing

it. For easy access to the serial line, use the USB service cable and a

terminal program on a PC. Instructions for using the serial line and the

serial commands are provided in Chapter 5, Operation, on page 32.

Examples of configurable settings for analog outputs:

1. Analog output mode, output parameters, and scaling.

2. Analog output error level.

Examples of configurable settings for RS-485 output:

1. By default, DPT146 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 serial output format to

suit your needs.

Selecting the Location

It is important that the conditions at the point of installation represent

well the gas to be measured. All leaks in the system must be eliminated

to avoid ambient humidity affecting the measurement.

Direct installation to the measured gas is the recommended installation

method if the temperature of the gas is suitable for DPT146 and no

additional filtering is needed due to very dusty or oily gas. Pressure at the

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 70 71

Pas de commentaire

Vaisala DPT146 Guide de l'utilisateur Page 23