MINItrol (MRT)

Flow Rate Totalizer from Pulse Inputs

The MINItrol (MRT) is a 6 digit totalizer and ratemeter with two level, 5 digit preset alarm control of total or rate. Inputs A & B have separate scaling K-factors. The totalizer can be programmed for “A” subtract “B”, “A” add “B” or A & B as separate totalizers, with display and control of the “net” total and rate of “A”. The MINITROL is also available in 4 other versions. MC2: a two preset totalizer with scaling, MR2: a high/low alarm ratemeter with scaling; The “MC”: a totalizing counter only, and the “MR”: a rate meter display only.



  • CSA Certified
  • Separate Scaling Factors For A & B Inputs
  • Display Rate & Total
  • Pulse Input – 10 kHz Max.
  • RS422/RS232 Serial Communication
  • Modbus RTU RS422/RS485/RS232
  • NEMA 4X / IP65 Front Panel
  • Separate Add/Subtract Simultaneous Inputs
  • Quadrature & U/D Direction Control Inputs
  • 30mV Magnetic Pickup Inputs
  • 4-20mA or 0-20mA Analog Output


Training Aids

(Coming Soon)


There are several reasons this could be happening. Please check the following:

Check connections to make sure input signal is getting to the unit. You can test the inputs by jumping terminal 7 12vdc output to the inputs. Make sure the Factor is set for one when testing this way. ¾
Check that the Factors are set to the proper values and NOT set at zero.
Under count in the program make sure the count speed is not set for Lo Cps if your input count speed is greater tha 40cps
Make sure the presets are not set at zero and the relays are not set for a duration output


The most frequent reason is that the Scaling Factors are set to the wrong values. Check that the Factors are set to the proper values for the sensor you are connecting.


There are several reasons this could be happening. Please check the following:

The unit is trying to display a value that is too large for the display. Check the decimal point location under count in the program.
The Factor value is to small

This will happen often with the Mag input option. Make sure customer is using shielded cable and it is grounded propperly.
Mag input option, noise on the line. Place a 1kohm resistor from terminal 8 to input terminal 5 or 6 which ever one is being used.


When the Relays are assigned to total and there is a duration set other than zero, the totallizer will count up to the preset value then the relay will close for the set duration of time and the totalizer will aut-reset to zero.
If this is not the desired operation enter the programming menu and under relays in the program change the “dur” (duration) to .00 or change the relays to follow the rate display.

Please try the following:

Make sure that the analog out option was ordered (check the model number to see if this option is specified)
The Analog Output is a sinking output and must be looped to a power source that is not common with the INT69. Preferably out of terminal 7 through meter and back to terminal 2.
Make sure the set Hi and set Lo are not both at zero.

The user can view the Rate of the A input and the Total of both A & B by pressing the view button on the front of the unit. The B Total is the display with all the decimals in it.

The MINItrol has EEPROM memory and is capable of storing program and count data for a minimum of 10 years. This is also referred to as non-volatile memory

The DC output is available when the unit is powered with AC Voltage. The D.C. output is rated at 50ma maximum current draw.

There are two separate dividing scale Factors that are entered as the number of pulses per desired unit of measurement.
Example: 50 pulses equal 10 pound of fluid. To display in pounds your Factor would be 5. (50 pulses / 10 pounds)

Below you will find typical wiring diagrams to help you connect a flowmeter or other sensor:

Number of items found



MS821 NEMA4X Enclosure

MS828 NEMA4X Enclosure
with Instrument Panel

XHV Explosion Proof
Housing for  Hazardous Areas

P20 Thermal Printer

P220 Impact Printer

IEPS-3000 Intelligent
EthernetMulti Port Server

IEPS-1000 Intelligent
Ethernet Single Port Server

to RS-232 Interface Converter
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