KEPmeter NAMUR DRT 2 Separate Rate and Total Displays

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 :


6-digit, 0.55” High LED

Input Power:

110 VAC ± 15% or 12 to 15 VDC
220 VAC ± 15% or 12 to 15 VDC
24VAC ± 15% or 12 to 15 VDC


250 mA DC max. or 6.5 VA(6.5W) AC

Output Power:

(AC-powered units only) +12 VDC @ 50 mA, unregulated -10 + 50%


Operating: +32°F (0°C) to +130 F (+54°C)
Storage: -40 F (-40°C) to +200°F (93°C)


0-90% Noncondensing


EEPROM stores data for 10 years if power is lost.


NAMUR Input:

Logic 0 < 1 mA; Logic 1 > 3 mA
Input Resistance 1000 ohms (typ.)


NAMUR input on Input A and Input B


Front Panel:

Resets displayed value and control output


4-30 VDC negative edge resets all counters, “A” counter or “B” counter
(user selectable).

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:


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 the relay coil, and 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 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.


CSA File# LR91109-7, CE Compliant