|
Specifications |
|
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 (6.5W) AC |
|
Inputs |
Namur Input |
Logic 0 < 1 mA; Logic 1 > 3 mA Input
Resistance 1000 ohms (typ.) |
|
3NB |
NAMUR input on Input A and Input B |
|
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. |
|
Reset |
Front Panel: |
Resets displayed total value and control
output. |
|
Remote: |
4-30 VDC negative edge resets all counters,
"A" counter or "B" counter (user selectable). |
|
Memory |
EEPROM stores data for 10 years if power is
lost. |
|
Control Output |
Relays: |
2 each N.O. Relay; 5 Amps 120/240 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 DRT. The output can be programmed to track
rate or total of the C display. This feature is avail-able
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. |
|
K Factor/Scaling |
The 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. |
|
Presets |
Two control outputs are provided. To set
relay A or B's functionality, press "menu" button until
"Relay" appears on the display, the A and B outputs can be
assigned to the rate alarm (high/low), or for total/grand
total. A 5 digit value can be entered for both presets A and
B. 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
corresponding totalizer will auto reset at the preset. This
may be used to create a relay scaled pulse output. |
Option:
RS232/RS422
with KEP Protocol |
If the serial interface option is supplied,
multiple 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 received and
transmitted over standard EIA RS232 or RS422 levels. Unit
number, baud rate and parity are entered in the "Program
Setting" set up mode and remain in memory even if power is
off. |
Option: RS232/RS422/RS485
with Modbus RTU Protocol |
The serial port can be used for serial
printing or also for data acquisition. The unit can assign
addresses up to 247 units (The terminal addressing the unit
must be capable of driving all loads in the loop.) The unit
can communicate with a master device through a Modbus-RTU
protocol. The data given for each parameter is in IEEE float
format comprising of 2 words. The unit can be connected in a
network.
Device ID: 01-247
Baud Rates: 300, 600, 1200, 2400, 4800, 9600
Parity: None, Odd, Even
Protocol: Modbus RTU (Half Duplex) |
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