AW Company RT-4 Instruction Manual

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RTRT--4 USER MANUAL4 USER MANUAL

The RT-4 is a battery-powered rate indicator/totalizer. Each unit has a 6 digit LCD display screen that can be
programmed to read in any engineering units. The expected battery life under normal operating conditions
is about 4 years.

Quite often the RT-4 is used to spot check gun, pump, valve and overall system efficiencies. When the RT-4
is used with the flow meter in this manner it is imperative to follow good flushing procedures for the flow
meter. The RT-4 will only perform as well as the flow meter. After each use the flow meter must be
thoroughly flushed and cleaned. If the meter will be stored for any extended period of time, we recommend
that the meter be disassembled, lubricated and reassembled.

Operating ModesOperating Modes

There are three modes of operation for the RT-4-- total mode, flow rate mode and programming mode.
Selection for the flow rate and total mode can be done by touching the MODE area of the front panel.

Total ModeTotal Mode

The maximum value totalized is 999999, regardless of units. There is only one totalizer selection. In order
to reset the total, the total mode must be selected. The totalizer can not be accidentally reset in flow rate
mode. To reset, push the reset button.

Flow Rate ModeFlow Rate Mode

The rate mode is based on a selectable gate time (see Explanation of Programmed Values). By using a
lower gate time the unit is more responsive. This may result in lower resolution, depending on the units
selected and the flow meter.

Programming ModeProgramming Mode
The four push buttons have the following functions:

UP button....................... MODE SELECTION, UP INTEGER and MOVE DECIMAL

DN button....................... RESET and DOWN INTEGER

PRG button...................... ENTER PROGRAMMING

ENT button...................... ENTRY

To To speed integer entry, while pressing either the UP or DN button, press the PRG speed integer entry, while pressing either the UP or DN button, press the PRG

key. This will change the display value in increments of 250. key. This will change the display value in increments of 250.

AW Company 8809 Industrial Drive, Franksville, WI 53126 (P)262-884-9800 (F)262-884-9810

Form: RT4.doc 01/01 Rev. 1

Explanation of Programmed VariablesExplanation of Programmed Variables
There are six programmed variables for the RT-4 indicator. They are:

PrPr------11 Time base in seconds (gate time) for rate measurement. This figure is based on the

flow rate at 100Hz. This is the time it takes for the flow rate display to update. Pr---1 is
linked to Pr---2 and Pr---3 as shown below. Before Pr---1 is programmed, Pr---2 and Pr--­3 should be calculated.

PrPr------22 A corrective variable for Pr---1. If the rate display update is too long, this variable

can reduce the update time.

PrPr------33 Decimal location for flow rate screen. Location of the decimal point will affect the

Pr---1 value.

PrPr------44 Front divider for the total. Only whole numbers can be inputted into this address

and it is linked to Pr---5.

PrPr------55 Factor for increasing resolution for totalizer.

PrPr------66 Decimal location for total screen.

PROGRAMMIPROGRAMMING FLOW RATENG FLOW RATE

To enter the programming mode press the program key. The display will show Pro-- which indicates that the
programming mode is active. In about 2 seconds the display will indicate Pr---1 which indicates the first
variable is ready to program. Pressing the up or down integer button changes the displayed value. Then
press the entry button to lock the value into the Pr---1 address. Once completed the display will scroll to the
Pr---2 variable and it will be ready for programming. Input the desired number and press entry and then
program the required decimal point for Pr---3.

How to calculate Pr---1:
From the calibration sheet select the K-factor in the desired engineering units. Then use the following

formula:

100 imp/sec X 60 sec/min = XX gal/min This is the flow rate at 100Hz.
K-factor imp/gal

For Example:
You have an HPM-15 flow meter and you would like to have the flow rate read in cc/min. From the calibration

sheet the average k-factor is 8.37 imp/cc.

100 imp/sec X 60 sec/min = 716.84 cc/min

8.37 imp/cc

OR

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AW Company 8809 Industrial Drive, Franksville, WI 53126 (P)262-884-9800 (F)262-884-9810

Form: RT4.doc 01/01 Rev. 1