Hach 911, User Manual

Page: 37 / 103

35
Meter Installation
4.4 Wiring the RS232 Interface
DANGER
All connections to the flow meter must be made in a non-hazardous location.
DANGER
Tous les raccordements au débitmètre doivent être effectués dans un
environnement qui ne présente aucun danger.
All RS232 interface wiring must follow the installation drawings in section 4.1 on page 15 .
4.4.1 RS232 Serial Port
DANGER
The RS232 Opto-Isolated Interface must be located in a non-hazardous location.
DANGER
L'interface à isolation optique RS232 doit se trouver en un emplacement non
dangereux, conformément aux schémas de contrôle de l'installation.
Note: A PC or laptop must be used in a non-hazardous location.
The high speed RS232 serial port communicates with a PC via an optically isolated
interface (
Figure 19 on page 35 ). The Opto-Isolated Interface (Cat. No. 4087) is used only
for data downloading and remote programming. This interface isolates the energy
potential in the PC from hazardous locations and from the 911 or 940 Flow Meters.
DANGER
Route the cable through an approved seal to prevent migration of dangerous fumes
or vapors from the hazardous location to the non-hazardous location.
DANGER
Acheminez le câble à travers un joint approuvé afin d'empêcher la migration de
Figure 19 RS232 Communications Setup
1 Use “approved” seal to minimize passage of gases or
vapors from a hazardous location to a non-hazardous
location. 3 PC compatible laptop or desktop located in a
non-hazardous location for downloading data
2 RS232, Opto-Isolated Interface in a non-hazardous
location (Cat number 4087) 4 940 or 911 Flow Meter in a hazardous location
4
1
2
3