Feature :
- Displays A,B,&C Rate & A,B,&C Total
- Separate Scaling Factors For A & B Inputs
- “C” Displays A+B, A-B, A÷B, & A÷A+B
- RS422/RS232 Serial Communication
- Modbus RTU RS422/RS485/RS232 (optional)
- Pulse Input - 10 kHz Max.
- Security Lockout
- NEMA 4X / IP65 Front Panel
- NAMUR Input - 10 kH
- 4-20mA or 0-20mA Analog Output (optional)• CSA Listed
The NAMUR DRT (NDRT) is a dual 5-digit Ratemeter 6-digit Totalizer in a 1/8 DIN package. The 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, and 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 the percent of A to B quantity or A÷[A+B(x100)] to show the percent of A to the total quantity. Two independent presets are standard. The user selects whether output A is activated by the total or rate value of input A or selected C. Output B can be activated by the total or rate value of input B or selected C.
Outputs activated by A or B total can be set to latch or auto recycling with an adjustable output duration from 00.1 to 99.9 sec. For rate, ratio, or C total outputs pull in when the value is equal or above the preset and drop out when a value is below the preset minus the selected 0 to 999 hysteresis.
Specification :
Display |
6-digit, 0.55” High LED |
|
Input Power: |
110 VAC ± 15% or 12 to 15 VDC |
|
Current: |
250 mA DC max. or 6.5 VA(6.5W) 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) |
|
Humidity: |
0-90% Noncondensing |
|
Memory: |
EEPROM stores data for 10 years if
power is lost. |
|
Inputs: |
NAMUR Input: |
Logic 0 < 1 mA; Logic 1 > 3
mA |
3NB: |
NAMUR input on Input A and Input B |
|
Reset: |
Front Panel: |
Resets displayed value and control
output |
Remote: |
4-30 VDC negative edge resets all
counters, “A” counter or “B” counter |
|
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. |
|
Control Output: |
Relays: |
2 each N.O. Relay; 5 Amps 120/240
VAC or 28 VDC. |
Analog Output: |
An optional 4-20mA (0-20mA) output
is available for the DRT. The output can be programmed to track the rate or
total of the C display. This feature is available by adding the 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. |
|
Approvals: |
CSA File# LR91109-7, CE Compliant |
Reference: kepmeter.com
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