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DESCRIPTION & SPECIFICATIONS
DESCRIPTION:
The MR 1000 Rate/Totalizer provides two level preset con-
trol of flow rate and total. Two pulse input channels enable
the MR 1000 to handle add/subtract and quadrature input, in
addition to standard single channel input. Five digit floating
decimal scale factors allow the MR 1000 to display total
count in engineering units and rate in units per second,
minute, or hour. Two separate 5 A relay contacts can be
used to operate secondary control devices. RS232 or RS422
serial communication is available for data exchange with a
host computer.
SPECIFICATIONS:
DISPLAY
6 digit, 0.55" High LED
INPUT POWER:
110 VAC ±15% or 12 to 15 VDC
220 VAC ±15% or 12 to 15 VDC
24 VAC ±15% or 12 to 15 VDC
CURRENT:
250 mA DC max. or 6.5 VA AC
OUTPUT POWER (AC powered units only)
+12 VDC @ 50 mA, unregulated -10 + 50%
TEMPERATURE:
Operating:
+32°F (0°C) to +130 F (+54°C)
Storage:
-40 F (-40°C) to +200°F (93°C)
MEMORY
EEPROM stores data for 10 years if power is lost.
INPUTS:
3: High Impedance DC pulse input 4-30 VDC (high), Open or 0-
1 VDC (low),10 KΩimp. 10 kHz max. speed. Accepts simul-
taneous inputs.
3M: Mag. Input, Input A only, accepts 30mV input (50 V max. P/P)
signals 10 KΩimp. 5 kHz max. (Input B, 4-30V)
3MB: Mag. Input, Inputs A & B, accepts 30mV input (50 V max. P/
P) signals 10 KΩimp. 5 kHz max.
5: 4-30 V Count pulses on Input A, 4-30 V Direction Control
input (level) on Input B.
5M: 30 mV Count pulses on Input A (50 V max. P/P) 4-30 V
Direction Control input (level) on Input B
9: Quadrature, accepts 4-30 V pulses with 90°phase shift for
direction detection.
9MB: Quadrature, accepts 30 mV (50 V max. P/P) pulses with 90°
phase shift for direction detection.
NOTE: The Mag. inputs have filtering as follows: up to 300hz
@30mV, 5KHz @ .25V to 50V max.
RESET:
Front Panel: Resets displayed value and control output
Remote: 4-30 VDC (75-240 V AC/DC, Input 8) negative
edge resets COUNTER "A" and control output
K FACTOR/SCALING
In the standard unit a fixed K-Factor is used to convert the input
pulses to engineering units. The 5 digit K-Factor dividers, with
decimal keyed into any position, allow easy direct entry of any K-
Factor from 0.0001 to 99999. Separate factors may be entered for
the 2 separate input channels.
CONTROL OUTPUTS:
Relays:
2 each N.O. Relay; 5 Amps120/240 VAC or 28 VDC.
(N.C. relay contacts and NPN transistor output
available with solder jumpers. Transistor output is
internally pulled up to 10 VDC through relay coil, sinks
from 10 VDC to .5 V @ 100 mA)
Analog Output:
An optional 4-20mA (0-20mA) output is available for
the MR 1000 series. The output can be programmed
to track rate or total. This feature is available by
adding suffix A to the part number. Connections are
via a 2 terminal pluggable screw connector.
Programming is accomplished by using the front panel
in conjunction with rear dip switches.
Accuracy: 50uA worst case.
Compliance Voltage: 3 to 30 VDC non inductive.
RS232/RS422SERIAL INTERFACE
If the serial interface option is supplied, up to 99 units can be linked
together. (The terminal addressing the unit must be capable of
driving all loads in the loop.) Unit status and new set points can be
communicated by serial communication. Mode changes, however,
must always be made on the front panel. Data is transmitted at
selected baud rates using standard seven bit ASCII characters and
parity with two additional bits of “Start” and “Stop” to make up the
standard ten bit character.
Data is received and transmitted over standard EIA RS232 or
RS422 levels. Each 10 bit character is made up of a start bit, 7 bit
ASCII code, parity bit and stop bit. Unit number, baud rate and
parity are entered in the “Program Setting” set up mode and remain
in memory even if power is off.
Note that the input impedance of RS232 is 3K or 7K Ohm worst
case. The terminal addressing the unit must be capable of driving
all loads in the loop. RS422 input impedance is much higher and
there is usually no problem driving 25 units. Unit serial transmit line
remains in a high impedance “OFF” state until addressed.
