1
DESCRIPTION & SPECIFICATIONS
DESCRIPTION:
The 913 DRT (Dual Rate Totalizer) is a dual 5 digit Ratemeter 6
digit Totalizer in a 1/8 DIN package. User selects 1 of 6 displays to
show A,B or C rate and A,B or C total. Inputs A and B have
separate scaling to read in engineering units.
A 4-20mA (0-20mA) output of the C rate or total is optional.
The user can press the VIEW button to see 6 separate items
total A, total B, total C, rate A, rate B, rate C. Negative values are
displayed with a negative symbol ( -
12345
). For the C value, the
user can choose from the following combination of A&B inputs:
TOTAL; with a choice of A+B or A-B; RATIO with choice of
A
÷
B(x100) to show percent of A to B quantity or A
÷
[A+B(x100)] to
show percent of A to total quantity.
Two independent presets are standard. User selects whether out-
put A is activated by total or rate value of input A or selected C.
Output B can be activated by total or rate value of input B or
selected C. Outputs activated by A or B total can be set to latch or
autorecycle with an adjustable output duration from 00.1 to 99.9
sec. For rate, ratio, or C total outputs pull in when value is equal or
above the preset and drop out when value is below the preset
minus the selected 0 to 999 hysteresis.
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 K
Ω
imp. 10 kHz max. speed. Accepts simul-
taneous inputs. May be used with KEP 711 series or PD & D
series sensors.
3M:
Mag. Input, Input A only, accepts 30mV input (50 V max. P/P)
signals 10 K
Ω
imp. 5 kHz max. (Input B, 4-30V)
3MB: Mag. Input, Inputs A & B, accepts 30mV input (50 V max. P/
P) signals 10 K
Ω
imp. 5 kHz max.
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 negative edge resets all counters,
"A" counter or "B" counter (user selectable).
K FACTOR/SCALING
The 913 DRT has two separate K-Factors that are 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; 10 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 913 DRT. The output can be programmed
to track rate or total of the C display. 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.
PRESETS
Two control outputs are provided. To set relay values, press “menu”
button until “Relay” appears on the display, the A and B outputs can
be assigned to the A,B or C displays. A 5 digit value can be entered
for both presets and the decimal point location is the same as the
counter. The outputs can be set to energize from 0.1 to 99.9
seconds or latch (0.0). If a value other than 0.0 is entered, the
counters will auto reset at the preset (for A&B counters).