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MM7501
DC INPUT
INTEGRATING TOTALIZER
PULSE OUTPUT TRANSMITTER
FEATURES
 | Provides an Output Pulse Rate Proportional to the DC Input |
| 1 V or 1 mA Minimum Input Span |
| Unlimited* Choice of Input/Output Ranges |
| Choice of Power Options |
| 10 + 5 Year Warranty |
DESCRIPTION
The MM7501 is used, together with a counter, to integrate or totalize flow and
other signals. Its output is a pulse rate proportional to a DC input. When
totalized on a counter, the pulses indicate the total flow or other quantity
being measured.
Typical input ranges are 4/20 mA, 10/50 mA, 0-1 V, 0-5 V, and 0-10 VDC. Other
ranges are available down to minimum spans of 1 V or 1 mA DC.
The MM7501 includes a frequency scaler (binary pulse rate divider) which,
together with wide-ranging zero and span controls, provides a 4096:1 range of
output pulse rate adjustment.
This allows the output to be scaled in engineering units (one pulse equals 1,000
gallons, for example). The output may be an spdt relay, a voltage pulse suitable
for driving a 12 V electromechanical, counter or an open collector output.
The module includes filtering and conditioning to reduce susceptibility to
transients and noisy operations. An integrating DC to frequency converter
generates the basic pulse rate.
TYPICAL APPLICATIONS
Totalizing flow, BTU, or any other quantity that can be represented in quantity
per unit time.
MOUNTING
The MM7501 is designed to plug into a standard
8-pin relay socket. Part number MP008 is a molded plastic socket suitable for
mounting on a flat surface or in a 2 3/4 inch wide PVC snap track (TRK48).
Use CLP-1 hold-down clip, if needed. A Killark HK Series explosion-proof housing
with dome and 8-pin socket is available (HKB-HK2D-8). A DIN rail mounted
socket (DMP008) is available for 35mm symmetrical DIN rail.
SPECIFICATIONS
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INPUT RANGE
Voltage
select any
range between ±10
V
(min span 1
V)
Current
select any range from 0 to 100 mA max
(min span 1 mA)
INPUT IMPEDANCE
Voltage
1 megohm
Current
2.0 V drop typical,
others
available
OUTPUT RANGE
7 pph min to 8 pps max at 20 mA
input
1 pps max with relay
(user adjustable)
TYPE OUTPUT
Relay
(standard)
spdt, 1 A contact
Transistor
(Option OC)
open-collector npn
transistor, sink
0.5 A, 24 V max
Pulse
(Option V)
12 V
60 msec pulse width
(others available)
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ACCURACY
+/-0.1% of span
LINEARITY
+/-0.1% of span
BREAKDOWN, P0WER/CIRCUITRY
>1500 VAC rms
OPERATING
TEMPERATURE
14°F
to 140°F
-10°C
to 60°C
TEMPERATURE STABILITY
±0.4% of span/°C max
POWER
115 VAC ±10%, 50/60 Hz
(2.5
W max)
230 VAC ±10%, 50/60 Hz
(2.5
W max) DC Power Option
24 VDC
(limits 21-32 VDC)
(2.5 W max)
Isolation
DC power supply to
input common:
10 megohms *
Within specified range limits
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CONNECTIONS
Power AC L1 or DC +
Power AC L2 or DC -
Input +
Input -
Relay Output
Output NC
Output C
Output NO
Option 'OC' or 'V'
Output +
Output -
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PINS
1
3
4
5
6
7
8
7
8
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