Contrec 104D User manual
MAN104DV1.4
FIELD MOUNTED
RATE TOTALISER
MODEL 104D
March 2015
MAN104D-V1.4
MAN104DV1.4
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 7
3.5 Total Conversion 8
3.6 Frequency Cutoff 9
4. Programming 10
4.1 Program Steps 11
5. Example 14
6. Outputs 15
7. Flowmeter Input 18
8. Installation 23
8.1 Wall Mounting 23
8.2 Removing the Front Panel 24
8.3 The Main Electronics 26
8.4 Wiring 27
8.5 Terminal Designations 27
Index 28
MAN104D-V1.4
Introduction 1
MAN104DV1.4
1. INTRODUCTION
The Model 104D Rate Totaliser is a microprocessor based instrument, Loop
Powered with a 4-20mA output and Alarms. It 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 104D Rate Totaliser conforms to the EMC-Directive of the Council of
European Communities 2004/108/EC, the LVD directive 2006/95/EC 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
MAN104D-V1.4
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.
Scale: The 4mA and 20mA points are programmable.
Resolution and Linearity: 0.05% of span.
Accuracy: 0.05% of span at 25°C.
0.1% (typ) of span, full temperature range.
Update Time: 0.5 second.
Connection: Two-wire.
Loop Power Supply: 9-28 Volts.
Supply Backup: 2 x User replaceable Lithium battery.
Outputs: Two open collector outputs suitable for driving DC
solenoids or external relays. The outputs can be
programmed to provide high and low flow alarms
or pulse output and low flow alarm.
Switching Power: 750mA. 30VDC maximum.
Specification 3
MAN104DV1.4
Pulse Duration: 1ms if CAL0 = 2 (unscaled pulse output).
If CAL0 = 1 (scaled pulse output) the duration of
the pulse automatically adjusts to the output
frequency:
a. 1ms if output > 50Hz.
b. 10ms if output = 5...50Hz.
c. 100ms if output < 5Hz.
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 104D to be attached to a 2"
vertical or horizontal pipe.
Turbine Meter Adaptor: An optional mounting stem is available for
mounting the Model 104D directly on turbine
flowmeters which have a 1" NPT boss or 1" BSP
boss.
4Operation
MAN104D-V1.4
3. OPERATION
The Model 104D 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 104D 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 104D 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
MAN104DV1.4
3.2 TEST MODE
The 104D has a Test Mode which can be entered by simultaneously pressing all 3
front panel keys. The tests are as follows:
Low Test By pressing the ACCUM TOTAL key, the low alarm
output (if installed) will go low. If a 4-20mA option
is installed, the output will go to 4mA.
High Test By pressing the RESET key, and depending on the
programmed pulse output mode, the high alarm
output (if installed):
a. will go low if CAL0 = 0 (high alarm output).
b. will output 100ms pulses every 0.5 sec if CAL0
= 1 (scaled pulse output).
c. will output 1ms pulses every 0.5 sec if CAL0 = 2
(unscaled pulse output).
If a 4-20mA option is installed, the output will go
to 20mA.
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
MAN104D-V1.4
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 104D 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.
Filter Factor vs Time to Reach New Reading
(for a step change in input signal)
0
20
40
60
80
100
120
010 20 30 40 50 60 70 80 90 100
Filter Factor
Time to Reach % of
New Reading (seconds)
90% of New Reading 99% of New Reading
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