Bronkhorst®
Instruction Manual IQ+FLOW® Series Digital Mass Flow / Pressure Controllers for Gases
9.17.045V
10
2.7
Analog / digital operation
Analog operation (single channel versions only)
For analog operation refer to the “Hook-up diagram IQ
+
FLOW®” or use an RJ-45
loose-end cable (7.03.419) to connect the required signals.
Digital RS232 operation
Digital operation over RS232 can be established when
using the following setup. Using a RS232 cable or a USB-
RS232 converter with a PC will allow you to use (free)
Bronkhorst® software for Windows, such as FlowDDE and
FlowPlot. See also
section 3.4
.
Digital RS485 operation
With digital operation over RS485 a bus-system with multiple instruments can be set up. See
section 3.5
for possible
systems.
2.8
Multi-functional switch operation
Micro-switch operation (single channel versions only)
Using the micro-switch on the instruments, several actions can be monitored and
started. The green LED is used for status indication. The red LED is used for
errors/warnings/messages. The micro-switch can be used to start several actions,
such as auto-zero, restore factory settings and bus-initialisation actions, if
applicable. See specific zero-procedure below and
section 3.3
for more details.
Multi-functional switch
Status LED
Error/Warning LED
Rotary switch operation (multi-channel versions only)
Select the communication type and Baud rate with the “COMM. TYPE” switch. Select
the node address with the “MSD” and “LSD” switch (e.g. MSD = 1 and LSD = 9 selects
node 19 for channel 1, but also node 20 and 21 for channels 2 and 3). See
section 3.3
for more details.
2.9
Purging
Do not apply pressure until electrical connections are made. When applying pressure to the system, avoid pressure shocks in
the system and increase pressure gradually. Also decrease pressure gradually when required.
In systems for use with corrosive or reactive media, purging for at least 30 minutes with a dry, inert gas (like Nitrogen or
Argon) is absolutely necessary before use. After use with corrosive, reactive or hazardous media (e.g. toxic or flammable),
purging is also necessary before the system is exposed to air.
For best accuracy, allow the IQ+FLOW® to warm up and stabilize for at least 30 minutes before starting measurement
and/or control of the fluid stream(s). This may be done with or without gas flow.
