MMG
TQI-021/1
3
1. DESIGNATION, FIELD OF APPLICATION
TQI-021/1 can be connected to any flowmeter having pulse output. This pulse output can be directly
an inductive transducer of a turbine meter, or a pulse output with higher signal level from a
preamplifier.
TQI-021/1 has been built from up-to-date circuits that ensure high reliability. The instrument can be
mounted in instrument rooms or field racks ensuring similar ambient conditions. In case the connected
flowmeter is operated in explosive area, it must be connected to the input through proper insulating
unit (Zener-barrier).
The TQI-021/1 calculates the flowrate of the flowing fluid based on the signals of the pulse signals of
the flowmeter, and summarizes the volume flowing through during the time of measurement. These
values are displayed digitally in technical units. The instrument even in power-off state keeps the
measured values and the programmed constants necessary for the calculations.
The TQI-021/1 signal processing unit is equipped with batch controlling function, pulse output for
remote counter, and current output for control and recording, furthermore limit contacts for control or
alarm.
2.
SPECIFICATION
2.1.
Inputs (Figure4.)
INP 1
Low-level pulse input (turbine transducer coil):
Inductive transducer (connected by Figures 6/A and 6/C )
Input signal level:
10 mVrms … 3 Vrms
Input frequency range:
0- 1500 Hz
INP 2
High-level pulse input:
Optocoupler LED:
max. 30 mA
NAMUR (two-wire current-pulse) input
LA6 preamplifier (connected by 6/B and 6/D Figures):
Current in "0" state of pulse:
max. 4mA
Current in "1" state of pulse:
min. 7mA, max. 20mA
Input frequency range:
0-1500 Hz
INP 3
Batch control remote start input
Type of input
make contact at start of batch
Input current
max. 20 mA
Voltage at the input
max. 5VDC
2.2.
Outputs (Figure 4.)
OUT 1
Remote counter operating output
Type of output:
24VDC control pulse.
Load:
100 mA
Duration of pulse:
presettable
(
dT
)
Volume unit per pulse:
presettable
(
Vo
)
OUT 2
Batch control output
Type of output:
make contact during batching
Load:
max.12W, max.42VDC, max.1A
