Contrec 102D User manual
MAN102D-V1.8
FIELD MOUNTED
RATE TOTALISER
MODEL 102D
APRIL 2019
MAN102D-V1.8
CONTENTS
1. Introduction 1
2. Specification 2
3. Operation 4
3.1 Display 4
3.2 Test Mode 5
3.3 Filtering 6
3.4 Calculation of Rate and Total 8
3.5 Total Conversion 9
3.6 Frequency Cutoff 10
4. Programming 11
4.1 Program Steps 12
5. Example 16
6. Power 17
7. Flowmeter Input 18
8. Installation 23
8.1 Wall Mounting 23
8.2 Removing the Front Panel 24
8.3 The Main Electronics 25
8.4 Wiring 26
8.5 Maintenance 26
8.6 Terminal Designations 26
9. Disposal 27
9.1 Instrument Disposal 27
9.2 Battery Disposal 27
Index 28
MAN102D-V1.8
Introduction 1
MAN102D-V1.8
1. INTRODUCTION
The Model 102D Rate Totaliser is a microprocessor based instrument which
accepts a frequency or pulse input from a wide range of flowmeters. The
instrument displays flow Rate, a Resettable Total and an Accumulated Total
directly in engineering units.
The instrument is compatible with a wide range of flowmeters including turbine,
paddlewheel and positive displacement flowmeters.
The instrument is fully programmable from the front panel; the user can program
scaling factors, decimal point positions, filter constants and timebase.
The Model 102D Rate Totaliser conforms to the EMC-Directive of the Council of
European Communities 2014/30/EU, the LVD directive 2014/35/EU and the
following standards:
EN61326:2013 Electrical equipment for
measurement, control and
laboratory use –EMC requirements :
Residential, Commercial & Light
Industry Environment & Industrial
Environment.
EN61010:2010 Safety requirements for electrical
equipment for measurement,
control, and laboratory use.
In order to comply with these standards, the wiring instructions in
Section 8.4 must be adhered to
2Specification
MAN102D-V1.8
2. SPECIFICATION
General
Display: LCD which is continuously powered.
Resettable Total: 7 digits with 10mm (0.4") high digits. Resettable
from front panel.
Accumulated Total: Displayed when the ACCUM TOTAL button is
pressed.
Rate: 4½ digits with 8.5mm (0.33") high digits.
K-factor: The pulses per unit of measure (eg. pulses/gallon)
is programmable in the range 0.000001 to
999,999.
Decimal Points: Decimal point positions are fully programmable
for both rate and total.
Timebase: Rate can be displayed in units per second, minute,
hour or day.
Frequency Range: 0.01Hz to 10kHz.
Signal Type: Link settable for sinewave (15mV P-P minimum),
open collector, reed switch, pulse or Namur
proximity switch.
Supply: 2 x User replaceable Lithium battery. 3.6V, AA
types. e.g. TADIRAN SL360/S, SAFT LS14500EX.
Note the battery polarity when replacing.
Battery Life: 2 years typical.
Specification 3
MAN102D-V1.8
Physical
Temperature: Operating temperature: -20°C to 60°C.
Dimensions: 97mm (3.8") high x 150mm (5.9") wide x 41mm
(1.6") deep (cable glands not included).
Protection: Sealed to Nema 4X or IP67 standards.
Cable Entry: By cable glands.
Wall Mounting: Universal mounting bracket supplied as standard.
Pipe Mounting: A galvanised metal bracket is available which
enables the Model 102D to be attached to a 2"
vertical or horizontal pipe.
Cutout: 141mm (5.6") wide x 87mm (3.4" high).
4Operation
MAN102D-V1.8
3. OPERATION
The Model 102D Rate Totaliser accepts a frequency or pulse input from a wide
range of flowmeters. The instrument is fully programmable with all operating
parameters and calculation constants programmable from the front panel. The
setup parameters are stored in a non-volatile memory and are retained for at
least 10 years in the event of a power loss.
3.1 DISPLAY
The Model 102D displays:
Rate
Resettable Total
Accumulated Total
Both the Rate and Resettable Total are displayed continuously. The Accumulated
Total is displayed only when the ACCUM TOTAL key is pressed.
The keys on the front of the 102D have the following functions:
Pressing this key will display the
Accumulated Total.
This key resets the Resettable Total
at any time.
This key is used during the Program
Mode.
Operation 5
MAN102D-V1.8
3.2 TEST MODE
The 102D has a Test Mode which can be entered by simultaneously pressing all 3
front panel keys. The tests are as follows:
Low Test N/A.
High Test N/A.
Display Test By pressing the PROGRAM key, all segments of the
display will flash.
To exit Test Mode, all three front panel keys are pressed simultaneously.
6Operation
MAN102D-V1.8
3.3 FILTERING
Frequency fluctuations caused by pulsating flow through a flowmeter can
interfere with the precision of the rate. For this reason, the Model 102D has a
digital filter which will average out these fluctuations and enable accurate
readings.
The degree of filtering of the input signal can be adjusted depending on the
amount of fluctuation and the particular application. Values from 1 to 99 can be
programmed where 1 corresponds to no filtering and 99 corresponds to heavy
filtering. Such flexibility in filtering means that highly accurate and stable
readings can be obtained.
When programming the degree of filtering, it is advisable to start with no filtering
(the factor equals 1) and gradually increase until a steady reading is obtained. It is
important that the filtering is not too heavy because this will cause an
overdamped response.
The following graph shows the time to reach 90% and 99% of a new reading for a
step change in input signal.
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