Operating Instructions for Digital Mass Flow Meter and Controller Model: DMS

Kobold Messring GmbH Chapter 3 Analogue Operation
CHAPTER 3: ANALOGUE OPERATION
Your DMS instrument may be operated in three different
ways:
THREE CONTROL OPTIONS
A. Analogue Input/Output Operation (This Chapter): Using
analogue input/output signals at the 15-pin mini-D connector.
B. Digital Operation with Pilot Module (Chapter 4):
Using the optional Pilot Module.
C. Digital Operation with RS-232 and DMS Software (Chapter 5):
Using the RS-232 link, the supplied DMS Software package
and a PC-style computer running the Windows operating system.
This chapter will discuss the first of these—Analogue Operation. Please
see subsequent chapters for other options.
Regardless of control options, the standard output for all DMS instruments
are two linear analogue output signals corresponding to 0% to 100% of
the mass flow full-scale range. Please note that one of these output signals
is always 4-20 mA. The other is user-configurable to 0-5 VDC, 0-10 VDC or
1-5 VDC.
For mass flow controllers, one input signal of 4-20 mA, 0-5 VDC, 0-10
VDC or 1-5 VDC (selectable by user) may be used to set the gas mass flow
rate to any desired value within the range of the device. This input signal
must be a direct linear representation of 0% to 100% of the desired gas mass
flow full-scale value. For the location of these signals on the HD DB-15
connector, refer to Figure 2-4: Wiring Definitions for Optional Communication
Cable in Chapter .
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DMS 3-1