METROVAL Controle de Fluidos Ltda.
Matriz:
Rua Christiano Kilmeyers, 819
13.460-000 - Nova Odessa - SP
Fone : (02119) 2127-9400
Filial :
Rua Albacora, 250
27.901-00 - Macaé - RJ
Fone : (02122) 2105-7200
1
RT-Ex15 FLOW MONITOR
Introduction / Features…..………..……………………...
Model Number/Sensor Options.……………………..…..
Specifications…..………..…………………………..…..
Dimensional Drawing.….……………………………….
Wiring Connections……….................………………….
DC Power Connection...........…………………...
Reset Input……….................…………………...
Limits/Pulse Output...............…………………...
Analog Output……................…………………...
Frequency Input (Calibration) Test Point.……….
Display/Programming Buttons and Magnetic Switches…
Disable External Programming....……………….
Programming the RT-Ex15..…………….....…..………..
Startup Message…………...........……………….
RT-Ex15 Display Modes………………….....…..………..
LOGO Mode – Turning On/Off Displays…….....
RATE Display Modes..............…………………..
RATE A GT .……................………………
RATE A PL .……................………………
RATE Mode Programming.............……………..
KFR A VALUE.................………………
GATE A B……..………….…………….
SAMPLE A………………………………
ENG UNITS A……………………...…...
TOTAL Display Modes.....…………………..….
TOTAL A Display…….……….….…….
GR TOTAL A Display…….……...…….
TOTAL Reset / Rollover…….…….…….
TOTAL Mode Programming........................……
KFT A VALUE.…........…………….…..
ENG UNITS A...….…..…………………
STATUS ONE Display Mode.….……………...
ANALOG OUT Display Mode.….……………...
ANALOG OUT Programming.…………………
MA OFFSET.…........………………..….
ANALOG POINT....…..………………...
VALUE AT 20 MA………………………
LIMITS Display Mode...........…….……….…….
LIMITS Programming……………………………
RATE/TOTAL limits……...……………..
CYCLE OUT (Totalizer Pulse Output)….
RATE & TOTAL Display Mode ....……………..
BATCH TOTAL Display Mode ....……………..
BATCH TOTAL Programming.......……………..
QUICK-GUIDE to the RT-Ex15 Variables & Displays...
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2
Introduction / Features
The RT-Ex15 is a meter-mounted digital flow monitor housed in a Class I Div. I Rated
Enclosure. A large, back-lighted LCD graphic display provides easy to read indication of
flow rate or total in user programmable engineering units. Programming, display mode
selection or reset of the totalizer are accomplished using an attached magnet without opening
the enclosure or using the pushbuttons on the faceplate with cover off. An isolated input also
allows for remote reset of the totalizer. Programmable opto-isolated NPN open-collector
outputs provide flowrate limit indication or a pulsed total output for remote monitoring and
recording of totals. A 4-20 mA rate output with user programmable filtering and scaling is
also provided for remote indication.
RT-Ex15 Model/Sensor options:
RT-Ex15A
RT-Ex15B
RT-Ex15C
RT-Ex15D
RT-Ex15EX
MAG-PB sensor (standard) for JV-CG/KG, HPM & TRG series flowmeters.
IR-PB sensor for JVK series flowmeters.
CP-30 high temp sensor (to 350ºF) for JVM-CG/KG, JVS-CG/KG HPM series meters.
MG-300 sensor for TR series turbine flowmeters.
Ex ‘d’ HUB style sensor for JV-CG/KG, HPM & TRG series meters with hub option.
Specifications
Power Requirement:
15-24 VDC/200mA. (customer supplied)
Sensor/Monitor Frequency Range:
0-4000 Hz.
Analog Output 4-20 mA:
16-bit Isolated Loop Powered 2-Wire Output.
12-27 Vdc Loop Supply
Max. Load Impedance 500 Ohm.@ 27V
Max. Load Impedance 250 Ohm.@ 12V
Two Opto-Isolated Open-Collector Outputs:
5-30 VDC Rating, 50 mA Max. (Minimum Load
Impedance Required, 600 Ohm @ 30 VDC)
Opto-Isolated Reset Input:
5-30 VDC Input, 3.3Kohm Impedance
Temperature Ratings:
-20 to 85ºC (-4 to 185ºF) Ambient
85ºC (185ºF) Max. Fluid Temperature (standard)
175ºC (350ºF) Max. Fluid Temperature (RT-Ex15C)
Enclosure Certifications:
Class I, Groups B, C, D
Class II, Groups E, F, G
Class III
Atex: EEx d IIC, IP68
NEMA 4X, 7BCD, 9EFG
Connection:
Screw terminal strips
½” NPT Conduit Entrance
RT-Ex15 Dimensions
8 in.
1/2" NPT WIRE
ENTRANCE
4.5 in.
5 in.
2.6 in.*
SWIVEL
FITTING
GT
RA 002.50 GPD
TA 003.23 GAL
MAGNET
WAND FOR
PROGRAMMING/
RESET/
DISPLAY
SELECTION
* WITH MAG-PB
SENSOR.
WIRING
TERMINAL
COVER
3
Wiring Connections
Wiring connections are to terminal strips inside the rear cover. A ½” NPT wire exit for conduit
connection is provided. Connection to conduit is required to maintain the enclosures explosionproof rating and must be made in accordance with all local and national electrical codes. TO
PREVENT IGNITION OF HAZARDOUS ATMOSPHERES, DISCONNECT CIRCUITS
BEFORE REMOVING COVER. KEEP COVER TIGHTLY CLOSED WHILE
CIRCUITS ARE ALIVE.
DC Power Connection
The RT-Ex15 requires a 15-24 VDC/200mA supply for operation. The RT-Ex15 is internally
isolated from the DC supply by a DC/DC converter. A power-on LED is provided on the
connection board and a 2 Amp mini-fuse protects the circuitry in case of a supply fault. (See
drawing below).
WIRING TERMINALS
(UNDER REAR COVER)
CUSTOMER CONNECTIONS
2A MINI-FUSE
(LEFT TO RIGHT)
F2
LOOP -
+Vcc
LOOP +
LE2
LIMIT2 -
LIMIT2 +
LIMIT1 -
LIMIT1 +
RESET-
RESET+
EARTH GROUND
15-24/DC SUPPLY
SUPPLY NEGATIVE
EARTH GROUND
SUPPLY NEGATIVE
LE1
POWER
LED
15-24V/DC SUPPLY
ENCLOSURE
GROUND
TERMINAL
Z00257 ver 1.2
JUL 2005 aw
mA OUT
LED
+Vdc Supply
-Vdc Supply
(Not Used, use Encl. Gnd Term.)
RESET +
RESET LIMIT1 +
LIMIT1 LIMIT2 +
LIMIT2 -
Optically
Optically
Optically
Optically
Optically
Optically
isolated
isolated
isolated
isolated
isolated
isolated
input (+)
input (-)
output (+)
output (-)
output (+)
output (-)
+Vcc
LOOP +
LOOP -
Supply Output (same as DC Supply)
Isolated mA Loop (+)
Isolated mA Loop (-)
Reset Input
Opto-isolated input to reset the TOTAL A (Job Total). See TOTAL A RESET on page 11 for
information regarding reset of the job totalizer.
RESET INPUT
(Isolated)
3.3 Kohm RESET +
Momentary
5-30VDC
RESET -
+
Limits/Pulse Outputs
Two opto-isolated NPN open-collector outputs can sink or source depending on connection.
Attention must be paid to polarity of connections, collector (+), emitter (-). See diagram below.
Output ratings are listed on page 2. Either output can be assigned to a rate limit, total limit for
batching or as a totalizer pulsed output. See LIMITS Display Mode and LIMITS Programming
on page 15 for information regarding the display and programming of the limit and pulse output.
LIMIT OUTPUTS
(Isolated)
100 Ohm
50 mA Max.
LIMIT (+)
(Collector)
5-30VDC
LIMIT (-)
(Emitter)
4
Analog Output
The isolated 16-bit 4-20mA output can be wired in a 2-wire loop-powered arrangement or loop
power can be supplied via the DC supply as shown in the wiring examples below. The mA LED
will light with varying intensity in proportion to the mA output for troubleshooting purposes.
The assignment, offset, and scaling values for the mA output are programmable. See ANALOG
OUT Programming on page 13 for information regarding set-up of the analog output.
mA LOOP OUTPUT (2-WIRE)
(Isolated)
mA OUTPUT (3-WIRE)
(Loop Power from RT-Ex15 DC Supply)
+Vcc
LOOP +
LOOP +
AD421
mA LED
+
V loop
AD421
mA LED
LOOP -
12-27 Vdc
R sense
R sense = 250 Ohm max. @ 12-15 Vdc
R sense = 500 Ohm max. @ 15-27 Vdc
LOOP SUPPLY NEGATIVE
+
-
R sense
R sense = 250 Ohm max. @ 15 Vdc
R sense = 500 Ohm max. @ 24 Vdc
Frequency Input Test Point
The RT-Ex15 has a frequency input test point allowing the user to directly input a frequency
signal. This is especially useful for purposes of setting up and testing pulse output or analog
output signals during commissioning when flow is not present or where it is not feasible to allow
continuous flow for set-up and calibration purposes. The position of a programmable jumper
must be changed to allow use of the test point input. The test points and jumper positions are
detailed in the diagram below. Be certain to change the jumper back to the correct position
before beginning normal operation using the sensor nose.
Test Point input specifications:
Waveform: DC signal - pulse, square-wave, triangle, or sawtooth.
Minimum signal amplitude: 2 Volts peak.
Maximum signal amplitude: 10 Volts peak.
Frequency: 0-4000Hz
Test Point (-)
(Isolated
Supply
Common)
Test Point (+)
(Signal Input)
RA 002.50 GPDGT
TA 003.23 GAL
Program
Jumper
CALIBRATION
TEST POINTS
& JUMPER
JUMPER SETTINGS
1 2 3
1 2 3
Normal
Operation
Jump 1 & 2
Test Point
Operation
Jump 2 & 3
5
Display/Programming Buttons and Magnetic Switches
Display mode changes, reset of total and programming functions are accomplished using the
buttons located on the face plate when the cover is off or external to the cover using the magnetic
switches. The magnetic switches are located at the 3, 6, 9 and 12 o’clock positions on the side of
the housing. The function of each position is indicated on the faceplate of the RT-Ex15.
Touching the side of the magnet wand to the appropriate location will activate the magnetic
switches.
MAGNETIC SWITCH LOCATIONS
DISPLAY/PROGRAMMING
BUTTON LOCATIONS
DN/
MODE
MAGNETIC
SWITCH (MODE/DN)
MODE/DN
BUTTON
RESET/UP
BUTTON
MAGNETIC
SWITCH
(ENT)
GT
GPD
RA 002.50
TA 003.23 GAL
SEL
BUTTON
ENT
MAGNETIC
SWITCH
(SEL)
ENT
BUTTON
MAGNETIC
SWITCH (RESET/UP)
1
14
GT
RA 002.50 GPD
TA 003.23 GAL
SEL
1
14
RESET
UP/
TOUCH SIDE OF MAGNET TO SWITCH LOCATION
Display mode changes, reset of total and programming functions are accomplished using the
buttons located on the face plate when the cover is off or external to the cover using the magnetic
switches. The magnetic switches are located at the 3, 6, 9 and 12 o’clock positions on the side of
the housing. The function of each position is indicated on the faceplate of the RT-Ex15.
Touching the side of the magnet wand to the appropriate location will activate the magnetic
switches.
Disable External Programming
All programming is initiated by using the ENT button located on the face plate when the cover is
off or external to the cover using the ENT magnetic switch when the cover is installed. The ENT
external magnetic switch can be disabled to prevent programming when the cover is on. A
jumper is located on the back of the main circuit board on the edge at the 9 o’clock position. If
the jumper is set to disable the ENT magnetic switch, the MODE and RESET external magnetic
switches are still active to allow mode changes and total reset but program changes can not be
made without removing the cover and using the ENT button on the faceplate. The default is
switch enabled.
PROGRAMMING
ENABLE/DISABLE EXTERNAL
PROGRAMMING JUMPER ON BACK
OF MAIN CIRCUIT BOARD AT THE
EDGE IN 9 O'CLOCK POSITION
(SEE DETAIL "A")
1
2
3
"ENT" MAGNETIC
SWITCH ENABLED
JUMP 1 & 2
1
2
3
"ENT" MAGNETIC
SWITCH DISABLED
JUMP 2 & 3
6
Programming the RT-Ex15
Power must be applied to perform programming and set-up of the RT-Ex15. The RT-Ex15 can
be programmed in the hazardous area with the cover on using the magnetic switches (if function
is enabled) or OUTSIDE THE HAZARDOUS AREA with the cover removed using the
programming buttons. IF THE COVER IS REMOVED FOR PROGRAMMING THIS
MUST BE DONE OUTSIDE THE HAZARDOUS AREA.
After variable programming is completed and the desired display mode is selected, disconnect
the power and tightly install the RT-Ex15 cover before installation in the hazardous area. See
Wiring Connections on page 3.
To scale the rate or total display, output, or limits, the RT-Ex15 will require programming of the
RATE, TOTAL, ANALOG OUT and LIMIT variables. All RT-Ex15 parameters are
programmed from the corresponding display screen. For example, to program the rate scalingfactor, decimal resolution and engineering units for display, select the RATE A GT display. This
manual will take the user through the various programming steps in order.
Startup Message
The RT-Ex15 displays an initial window at power up. After a second the following message will
be displayed in the window for approximately 2 seconds. After this message, the display will
revert to the last active Display Mode selected.
LOAD VARS
RT-EX15
TURN ON 0026.
MEM LEFT 099.9
VERSION 222
2006
LOAD VARS – Indicates that the variables are being recalled from EEPROM.
TURN ON
– Increments on each power-on cycle of RT-Ex15.
MEM LEFT – Memory life indicator displays % of memory life remaining in .1% increments.
The RT-Ex15 stores programmed variables and retained totalizer values in
EEPROM (electrically erasable memory). The limit on the number of times
memory can be re-written results in a minimum EEPROM life of 5 years with
continuous use. This memory IC can be replaced by AW Company if it
becomes necessary. Program variables require reprogramming after memory IC
change.
VERSION
– Indicates the software version installed in the RT-Ex15.
RT-Ex15 Display Modes
The RT-Ex15 has ten display/program modes:
LOGO
RATE A GT
RATE A PL
TOTAL A
GR TOTAL A*
RAT A TOT A*
STATUS ONE*
BATCH TOTAL
ANALOG OUT
LIMITS
*Display only, no programming function
7
During normal operation with the cover secured, the Display Mode is changed by touching the
side of the magnet wand to the MODE/DN location (top) on the outside of the housing. The
MODE/DN button is used to change the Display Mode when the RT-Ex15 cover is opened
during programming. The RT-Ex15 will retain the last display mode selected and display it on
power up. Seven of the display modes are also used to program the related variables.
LOGO Mode - Turning On/Off Displays
LOGO – Display Mode “RT-Ex15” is used during unit programming/set-up to turn-on or turnoff Display Modes. Not every user will require all of the display modes and any of the ten
Display Modes can be turned off based on a user’s particular needs. To reassign, turn-on, or turnoff a display mode, use the MODE/DN button or magnetic switch to select the LOGO display
mode. Press and hold the ENT button or activate and maintain the ENT magnetic switch. The
display will first show a P in the lower left-hand corner and then show DISPLAY 00 and indicate
which display mode is assigned to DISPLAY 00. DISPLAY 00 is assigned to the LOGO screen
allowing access for display activation/deactivation.
NOTE: It is highly recommended that displays to be turned off are done one at a time returning
to LOGO display after each screen is turned off. Always turn off the highest numbered
displays first.
To turn-off a display mode, use the ENT button or magnetic switch to scroll through the
DISPLAY #s until the appropriate display mode is encountered. Use the RESET/UP button or
magnetic switch to turn the display off. The DISPLAY # assignment will indicate OFF DISPL.
Use the ENT button or magnetic switch to store the current assignment and advance the RTEx15 to the next available display number (00-09) or exit the LOGO display programming
procedure.
To change a DISPLAY # assignment to a different mode use the SEL button or magnetic switch
to select from the available display modes. Any DISPLAY # can be assigned as any display
mode. Use the ENT button or magnetic switch to store the current assignment and advance the
RT-Ex15 to the next available display number (00-09) or exit the LOGO display programming
procedure.
To restore a Display Mode that has been turned off, use the ENT button or magnetic switch to
select a DISPLAY # with a OFF DSPL assignment. Select a display mode assignment using the
SEL button or magnetic switch. Use the ENT button or magnetic switch to store the current
assignment and advance the RT-Ex15 to the next available display number (00-09) or exit the
LOGO display programming procedure.
NOTE: The LOGO screen can be turned off, but as it will no longer appear there is no way to
access screen programming. If the LOGO display is turned off for any reason it can be restored
to allow access to screen programming by cycling the power to the RT-Ex15 while pressing and
holding the ENT button or maintaining the ENT magnetic switch. This will reactivate the LOGO
screen as DISPLAY 00 and restore access to LOGO screen programming.
8
RATE Display Mode
The RT-Ex15 continuously calculates rate by two methods simultaneously, Gate Time and Pulse
Width.
Gate Time - (RATE A GT.) Rate is displayed based on the number of pulses counted during a
prescribed time period. RATE A GT is updated at the programmed interval regardless of
the input frequency. Increasing the gate time interval produces a filtering or averaging
effect useful for stable display and output of uneven or intermittent flows. The RT-Ex15
analog output is assigned to RATE A GT..
Pulse Width - (RATE A PL) Rate is displayed based on the time from pulse edge to pulse edge.
The Pulse Width Method is highly responsive, updating more frequently at high input
frequencies and less frequently at lower input frequencies. RATE A PL is useful for
observing flow variations or peak intermittent flows. A digital filter SAMPLE A can be
used to produce a more stable display response.
RATE A GT – RATE A Gate Time. Displays the rate by the gate time method based on the
programmed GATE AB variable and displayed based on the corresponding KFR factors, decimal
locations and engineering units. The zero cutoff frequency for display and analog output is .3
Herz. The pulse length measurement RATE A PL can be viewed by using the SEL button or
magnetic switch while in the RATE A GT display as illustrated below. The rate display will revert
back to RATE A GT if power is cycled to the RT-Ex15. A typical display would be:
RATE A PL – RATE A Pulse Length. The rate is calculated by the pulse length method based on
the SAMPLE A variable and displayed based on the corresponding KFR factor, decimal location
and engineering units. The gate time measurement RATE A GT can be viewed by using the SEL
button or magnetic switch while in the RATE A PL display as illustrated below. The rate display
will revert back to RATE A PL if power is cycled to the RT-Ex15. A typical display would be:
9
RATE Mode Programming
The Rate parameters are programmed from the RATE A GT or RATE A PL display screen. RATE
A PL variables can also be programmed from the RATE A GT screen or vice versa by toggling to
the RATE A PL mode using the SEL button or magnetic switch. Use the MODE/DN button or
magnetic switch to select the RATE GT display. Press and hold the ENT button or maintain the
ENT magnetic switch. The display will first show a P in the lower left-hand corner and will then
display the first program variable for that rate display mode. Three parameters will be accessed
for either mode as follows:
RATE A GT
⇒ KFR A VALUE
⇒ GATE A B
⇒ ENG UNITS A
RATE A PL
⇒ KFR A VALUE
⇒ SAMPLE A
⇒ ENG UNITS A
KFR A VALUE – Scaling factor to display rate in a desired engineering unit such as GPM. The
KFR factor entered here will also determine the decimal resolution of the rate display. The KFR
is calculated using the K-factor of the transducer being monitored. The K-factor is the number
of impulses per engineering unit established by the transducer manufacturer or by a calibration
test. The K-factor and the recommended KFR values are given on the AW Co. Calibration sheet.
Initial default is
100.00 (Displays Hertz w/ two decimal places)
The KFR factor is calculated using the following formula:
KFR= Time Base Constant/K-FACTOR
Where:
-
100 is the time base constant for eng. units per second
6000 is the time base constant for eng. units per minute
360000 is the time base constant for eng. units per hour
8640000 is the time base constant for eng. units per day
K-FACTOR is the average number of pulses per desired
eng. unit that the transducer produces.
Determine the number of decimal places desired for rate display, round off the result of the
formula to the desired accuracy and enter the KFR using only that number of decimal places.
Using too few decimal places can cause relatively large display errors up to several percent of
actual reading. Using too many decimal places can result in displays with a level of precision
exceeding the accuracy of the meter. It is recommended to use no more than four digits
regardless of decimal point position! The largest acceptable value for KFR is 65535 with the
decimal in any location.
For example:
A flowmeter has a K-factor 2053.57 imp/Gal and the display should read in Gal/Min.
with accuracy to three decimal places.
KFR = 6000 / 2053.57 = 2.921741 for GPM
Round off 2.921741 to three decimal places and enter 2.922 for KFR.
10
When entering or editing the KFR value, the leftmost digit will blink (cursor). Select the digit to
edit using the SEL button or magnetic switch. The cursor will move to the right and will wrap
around. The decimal point can be relocated when it is selected (blinking). Use the UP or DN
button or magnetic switch to increment or decrement the variable value or move the decimal
point. Use DN to move the decimal point to the right, UP to move it to the left. When the
desired value is displayed, use the ENT button or magnetic switch to store the programmed value
and advance to the next variable.
GATE A B – Gate time. This variable sets the sample time on the incoming frequency for the
RATE A GT (Gate Time) displays. This variable is programmed in tenths of a second and the
allowable range is from .01 to 600 seconds. This variable affects the update of the display and
analog output and is useful in stabilizing the display and output when dealing with slight
variations in flow. Do not set GATE TIME to zero as it will disable rate display.
When entering or editing the value, the digit being edited will blink starting with left-most digit.
Select the digit to edit using the SEL button or magnetic switch. Use the UP or DN button or
magnetic switch to increment or decrement the variable value. When the desired value is
displayed, use the ENT button or magnetic switch to store the programmed value and advance to
the next variable.
Initial default is
002.00 seconds
SAMPLE A - This variable determines the amount of digital filtering performed on the
incoming frequency for the RATE A PL (Pulse Length) display. The allowable range is from 0 to
253 with 0 providing the least level of filtering and 253 the maximum. This variable affects the
update of the display and analog output and is used as a filter to stabilize the display and output.
Initial default is
010
When entering or editing the value, the digit being edited will blink starting with left-most digit.
Select the digit to edit using the SEL button or magnetic switch. Use the UP or DN button or
magnetic switch to increment or decrement the variable value. When the desired value is
displayed, use the ENT button or magnetic switch to store the programmed value and advance to
the next variable.
ENG UNITS A - The desired engineering units for display of rate are programmable using up to
four letters. Example: GPM_
Initial default is
HZ__
NOTE: The engineering units display does not affect the scaling in any way and serves as
nothing more than a label. The rate scaling is performed in the KFR calculation.
The first (left-most) character will be highlighted with the blinking cursor first. The SEL button
or magnetic switch moves the cursor and the UP or DN button or magnetic switch scrolls
through the alphabet. When the characters are all entered, use the ENT button or magnetic switch
to store the variable. The RT-Ex15 will exit the variable programming mode and return to the
selected display.
11
TOTAL Display Modes
The RT-Ex15 displays the JOB or GRAND total based on the programmed KFT, engineering
unit, and decimal location. There are two TOTAL displays, TOTAL A (Job Total) and GRAND
TOTAL A. The GRAND total is a second totalizer with a secured reset. Both totals are retained
by the RT-Ex15 when the power is removed. The totals retained at power-down are updated
once every 25 seconds. Due to this update interval, the totals retained may not include previous
flow for up to 25 seconds if flow was present when the power was removed.
TOTAL A DISPLAY
Displays Job Total A. Also used for programming of total scaling factor KFT and reset of
TOTAL A and GR TOTAL A. The grand total GR TOTAL A can be viewed by using the SEL
button or magnetic switch while in the TOTAL A display as illustrated below. The rate display
will revert back to RATE A GT if power is cycled to the RT-Ex15.
GR TOTAL A DISPLAY
For display of GR TOTAL A only. No programming or reset functions are associated with this
display.
TOTAL A RESET – The Job total can be reset using the RESET/UP magnetic switch (or the
RESET/UP button while cover is open) when TOTAL A or RAT A TOT A is displayed. Use the
MODE/DN magnetic switch or button to select a total display. TOTAL A can also be reset at
anytime using the Reset Input. See page 3 for wiring information.
GR TOTAL A RESET – The Grand total can only be reset with the cover off via the front
panel buttons using a multiple step sequence. To reset GR TOTAL A, select the TOTAL A
display mode using the MODE/DN button. Use the SEL button to change to the GR TOTAL
display. Press the RESET/UP and ENT buttons simultaneously and hold until the RT-Ex15
responds. A warning will appear on the screen requesting yes/no verification before resetting the
GR TOTAL. The RT-Ex15 prompts the user either to press the ENT button to accept the default
answer of NO and exit the reset procedure at this point, or to reset the total. To reset, use the SEL
button first to toggle the response to YES and then press the ENT button. GR TOTAL A will be
reset to zero by this operation.
TOTAL A Rollover – RT-Ex15 JOB totals will rollover to zero when the total reaches a value
of 999999 regardless of the decimal location. When a JOB total rolls over or is reset, the contents
of the JOB total are then added in memory to the GRAND total.
GR TOTAL A Rollover – To allow retention of the largest possible GRAND total before data
loss, after reaching a value of 999999 regardless of decimal location, a floating decimal feature
on GRAND TOTAL rollover automatically reduces decimal resolution by a maximum of two
decimal places before rolling over to zero and losing the total. Example: For a KFT with 4
decimal places the GRAND total will reach 9999.99 instead of 99.9999 before resetting to zero.
12
Total Mode Programming
The Total parameters are programmed from the TOTAL A display screen. With the cover open,
use the MODE/DN button or magnetic switch to select the TOTAL A display. Press and hold
the ENT button or maintain the ENT magnetic switch. The display will first show a P in the
lower left-hand corner and will then display the first program variable for the TOTAL display
mode. Two parameters will be accessed from the TOTAL screen as follows:
TOTAL A
⇒KFT A VALUE
⇒ENG UNITS A
KFT A VALUE – Scaling factor to display totals in a desired engineering unit such as Gallons.
The KFT value entered here will also determine the decimal resolution of the total display. The
KFT is calculated using the K-factor of the transducer being monitored. The K-factor is the
number of impulses per engineering unit established by the transducer manufacturer or by a
calibration test. The K-factor and recommended KFT value are given on the AW Co. Calibration
sheet.
Initial default is
10000. (Displays total pulses w/ no decimals)
The KFT factor is calculated using the following formula:
KFT= 10000/K-FACTOR
Where:
- 10000 is a constant
- K-FACTOR is the average number of pulses per desired
eng. unit that the transducer produces.
Determine the number of decimal places desired for total display, round off the result of the
formula to the desired accuracy and enter the KFT using only that number of decimal places.
Using too few decimal places can cause relatively large display errors up to several percent of
actual reading. Using too many decimal places can result in displays with a level of precision
exceeding the accuracy of the meter. It is recommended to use no more than four digits
regardless of decimal point position! The largest acceptable value for KFT is 65535 with the
decimal in any location.
For example:
A flowmeter has a K-factor 2053.57 imp/Gal and the display should read in Gallons with
accuracy to three decimal places.
KFT = 10000 / 2053.7 = 4.869568 for Gallons
Round off 4.869568 to three decimal places and enter 4.870 for KFT.
13
When entering or editing the KFT value, the leftmost digit will blink (cursor). Select the digit to
edit using the SEL button or magnetic switch. The cursor will move to the right and will wrap
around. The decimal point can be relocated when it is selected (blinking). Use the UP or DN
button or magnetic switch to increment or decrement the variable value or move the decimal
point. Use DN to move the decimal point to the right, UP to move it to the left. When the
desired value is displayed, use the ENT button or magnetic switch to store the programmed value
and advance to the next variable.
ENG UNITS A - The desired engineering units for display of total are programmable using up
to four letters. Example: GALS
Initial default is
PULS
NOTE: The engineering units display does not affect the scaling in any way and serves as
nothing more than a label. The total scaling is performed in the KFT calculation.
The first (left-most) character will be highlighted with the blinking cursor first. The SEL button
or magnetic switch moves the cursor and the UP or DN button or magnetic switch scrolls
through the alphabet. When the characters are all entered, use the ENT button or magnetic switch
to store the variable. The RT-Ex15 will exit the variable programming mode and return to the
selected display.
.
STATUS ONE Display Mode
The STATUS ONE screen displays the Rate A PL, Total A, and the analog output value in mA.
This screen is useful for set-up or troubleshooting. A typical display would be:
ANALOG OUT Display Mode
The ANALOG OUT display mode displays the analog output command value in milliamps.
NOTE: This is the commanded value, not the actual value, and under certain conditions some
difference could occur between the displayed value and the actual mA output value. The twodigit number shown after ANALOG OUT indicates what the output represents. In this case, “00”
indicates that the output represents RATE A GT. See the Analog Point parameter for more
information regarding output assignment. A typical display would be:
ANALOG OUT Programming
The signal assignment, offset and scaling values for the mA output are programmable from the
ANALOG OUT display screen. The output can represent rate or total and the flow rate or total
value represented by the maximum output is programmable. Use the MODE/DN button or
magnetic switch to select the ANALOG OUT display.
14
To program press and hold the ENT button or maintain the ENT magnetic switch. The display
will first show a P in the lower left-hand corner and will then display the first program variable
for this mode. Three parameters will be accessed in order as follows:
⇒MA OFFSET
⇒ANALOG POINT
⇒ENTER VALUE AT MAX MAs
MA OFFSET – This variable is used to set to lowest value for the mA output span and as a fine
offset adjustment in the field if necessary. The low range of the output span is programmable
between 4.00 and 10.00 mA. The RT-Ex15 will not accept a value less than 4 mA. The RT-Ex15
utilizes the output device AD421 manufactured by Analog Devices. The minimum output is
trimmed to 4.00mA by the device manufacturer. Consult the manufacturer’s data sheet for
AD421 for complete specifications regarding offset tolerance.
When entering or editing the value, the digit being edited will blink starting with left-most digit.
Select the digit to edit using the SEL button or magnetic switch. Use the UP or DN button or
magnetic switch to increment or decrement the variable value. When the desired value is
displayed, use the ENT button or magnetic switch to store the programmed value and advance to
the next variable.
ANALOG POINT – This variable is used to “point” to an output assignment for the analog
output. The output can be assigned to represent one of 3 possible functions as follows:
RATE A GT (#00)
RATE A PL (#01)
TOTAL A (#02)
A number corresponding to the output assignment is displayed to indicate the current function of
the analog output. The default assignment for the ANALOG POINT is RATE A GT (#00). RATE
or TOTAL assignments will produce an output ranging from the MA OFFSET value (4-10 mA)
for a zero value, to 20 mA for the maximum programmed flow rate or total.
Use the SEL button or magnetic switch to select the output assignment. Use the ENT button or
magnetic switch to store the desired output assignment.
ENTER VALUE AT MAX MA’S – This scaling variable is used to set the maximum mA
output (20mA.) to a corresponding rate value producing an output ranging from the MA
OFFSET value (4-10 mA) for a zero value, to 20 mA for the maximum programmed flow rate.
The entry will correspond with the KFR, decimal location and engineering units for RATE A GT.
The initial value is a rate of 10 HZ.
When entering or editing the value, the digit being edited will blink starting with left-most digit.
Select the digit to edit using the SEL button or magnetic switch. Use the UP or DN button or
magnetic switch to increment or decrement the variable value. When the desired value is
displayed, use the ENT button or magnetic switch to store the programmed value and advance to
the next variable.
15
LIMITS Display Mode
The RT-Ex15 has two programmable limit outputs: L1 & L2. The LIMIT display shows the
function that each limit is assigned to, the value in engineering units at which each limit will
become active or change state, and the current status of the limit outputs. The limit values are
displayed using the KFR or KFT, decimal location and engineering units corresponding to the
limit assignment. A typical display would be:
LIMITS Programming
The Limits are programmed from the LIMIT display screen. L1 and L2 can be assigned to any of
the following functions.
RATE A GT
RATE A PL
TOTAL A
CYCLE OUT (Pulse Output)
RATE Limits / Limit MARGIN – To operate a limit based on RATE, select a RATE A
function based on pulse length or gate time measurement. The MARGIN variable is programmed
in engineering units and determines whether the limit functions as an absolute limit or activates
within a margin or “window” around the programmed RATE limit. When the MARGIN is
programmed as zero, the limit will activate whenever the selected RATE equals or exceeds the
programmed value. When a MARGIN value other than zero is entered, the limit will be active
whenever the selected RATE is within the “window” of the programmed RATE limit value plus
or minus the MARGIN value.
TOTAL Limits – To operate a limit based on the JOB TOTAL, select TOTAL A for the Limit
function. The limit will activate whenever the selected TOTAL equals or exceeds the
programmed value. See BATCH TOTAL Display Mode on page 17 for alternate set-up of total
limits.
CYCLE OUT (Pulse Output) – The CYCLE OUT limit function provides an incremental
output signal for a remote totalizer typically at a lower resolution and frequency. Either or both
limits can be assigned to a CYCLE OUT function. Assigning a limit to the CYCLE OUT
function will toggle the state of the limit output whenever Job TOTAL A has incremented by the
programmed cycle amount. The output will remain on until the cycle amount has accumulated
and turn off until the cycle amount has accumulated again as represented in the following
diagram. The total accumulated between a rising and falling edge is the cycle value. The total
accumulated between any two rising edges is twice the cycle value. The cycle value is entered in
engineering units corresponding to the programmed KFT and decimal location. Do not program
a cycle amount that will produce more than ten pulses per second (10 Hz). Consider the
maximum flowrate to determine the resulting output frequency. The frequency produced (in Hz.)
is the actual flow rate in Engineering Units per Minute divided by 120, divided by the CYCLE
AMOUNT.
NOTE: When considering a large cycle amount, keep in mind that any external totalizer will
miss up to at least one cycle amount of accumulation whenever power is cycled to the RT-Ex15.
16
CYCLE OUT (PULSE OUTPUT) Limit Function
2x CYCLE AMOUNT
LIMIT ON
CYCLE AMOUNT
LIMIT OFF
CYCLE AMOUNT
LIMIT ON
CYCLE AMOUNT
CYCLE AMOUNT
LIMIT OFF
CYCLE AMOUNT
LIMIT OFF
To program limit functions, use the MODE/DN button or magnetic switch to select the LIMIT
display. Press and hold the ENT button or maintain the ENT magnetic switch. The display will
first show a P in the lower left-hand corner and will then highlight the L1 indication with a
blinking cursor. Use the SEL button or magnetic switch to select the function of the limit
assignment. Use the ENT button or magnetic switch when the desired mode is displayed for L1.
The cursor will now highlight the numeric value to be entered for L1. Entries correspond with
the scaling factor, decimal location and engineering units for the function selected. The left-most
digit will highlight with a blinking cursor. Move the cursor left to right using the SEL button or
magnetic switch. Use the UP or DN button or magnetic switch to increment or decrement each
digits value. When editing is complete and the desired value is displayed, use the ENT button or
magnetic switch to store the programmed value for L1. If a RATE assignment has been made,
the RT-Ex15 will next prompt the user to enter the RATE LIMIT MARGIN in percent. The leftmost digit will be highlighted with the blinking cursor. Move the cursor using the SEL button or
magnetic switch. Use the UP or DN button or magnetic switch to increment or decrement each
digits value. When editing is complete and the desired value is displayed, use the ENT button or
magnetic switch to store the programmed RATE LIMIT MARGIN. The RT-Ex15 will then
highlight the L2 indication with a blinking cursor. Repeat the procedures used for L1. When the
L2 programming is complete, use the ENT button or magnetic switch to store the programmed
values and exit LIMITS programming.
NOTE: See Wiring Connections and Connection Diagram on page 3 for information regarding
connection to limit outputs.
RATE A / TOTAL A Display Mode
RATE A GT and TOTAL A (Job Total) are viewed on the same screen using the RATE A_TOT A
display. Rates and totals are displayed in the corresponding engineering units based on the
programmed KFR and KFT factors and decimal locations. The GR TOTAL can be viewed using
the SEL button or magnetic switch to switch between TOTAL A (TA) display and GR TOTAL
A (GA) display as illustrated below. After a power cycle, the RT-Ex15 will revert to the Job
Total (TA) display). Total A can be reset from this display using the RESET/UP button or
magnetic switch. Typical displays would be:
The RAT A TOT A display is only for viewing the rate and total simultaneously and has no
programming function. Rate and Total variables are programmed from the RATE A GT or RATE
A PL and TOTAL A screens respectively.
17
BATCH TOTAL Display Mode
The BATCH TOTAL displays the JOB A total and the S1 & S2 total limit activation levels.
When the RT-Ex15 is programmed for BATCH TOTAL operation, both limits are assigned as
TOTAL A limits based on the KFT, decimal point, and engineering units. The TOTAL limit
activation levels are displayed unless assigned to another function. If so, the S1 or S2 display
would read as XXXX to indicate that it is not assigned to JOB A TOTAL function. A typical
display would be:
BATCH TOTAL Programming
The BATCH TOTAL program mode is used to quickly dedicate both limits as total limits and
program the values at which the limits (labeled S1 & S2) will activate. The BATCH TOTAL
display must be viewed to program the BATCH TOTAL limits. Use the MODE/DN button or
magnetic switch to select the BATCH TOTAL display. Press and hold the ENT button or
maintain the ENT magnetic switch. The display will first show a P in the lower left-hand corner
and will then highlight the first limit assignment S1 indicated with a blinking cursor. Entering a
value will assign the limit as a total limit based on the KFT, decimal location and KFT
engineering units. Select the digit to edit using the SEL button or magnetic switch. Use the UP
or DN button or magnetic switch to increment or decrement the variable value. When the
desired value is displayed, use the ENT button or magnetic switch to store the programmed value
and move the cursor to S2. Select the digit to edit using the SEL button or magnetic switch. Use
the UP or DN button or magnetic switch to increment or decrement the variable value. When the
desired value is displayed, use the ENT button or magnetic switch to store the programmed value
and exit the BATCH TOTAL program mode.
If either limit has been previously assigned to a function other than TOTAL A, the RT-Ex15 will
respond by asking “Limit mode different, want to change it?” Use the SEL button or magnetic
switch to toggle a “N” or “Y” response and use the ENT button or magnetic switch to answer. A
“Y” response will reset any previous limit assignment to Total A and zero the limit value. A “N”
response will leave the limit assigned to the previous function and the S1 or S2 display will read
as XXXX to indicate that it has no function in this mode.
18
LOGO DISPLAY PROGRAMMING
With the cover removed and outside of
a hazardous area use MODE/UP
button* to view LOGO (RT-EX15)
display. Press and hold the ENT
button*. Display will first show a “P” in
the lower left-hand corner and then
show the display assigned as
DISPLAY 00. LOGO is assigned as
DISPLAY 00 to allow programming
access. Use SEL button* to select
from available display modes including
OFF. Press ENT button* to store
selection, increment display number,
and show the next display assignment.
222222222222222222
MAGNETIC SWITCH LOCATIONS
DN/
MODE
* or magnetic switch in hazardous area
with cover closed
1
14
ENT
GT
RA 002.50 GPD
TA 003.23 GAL
SEL
1
14
RESET
UP/
TOUCH SIDE OF MAGNET TO SWITCH LOCATION
TO PROGRAM RT-EX15 PARAMETERS
With the cover removed and outside of a hazardous area, use the MODE/DN button* to select the display to program. Press and hold
the ENT button*. The display will first show a “P” in the lower left-hand corner and will then display the first program variable for that
display mode. The RT-Ex15 will prompt for a variable selection or numeric entry.
When entering or editing numeric values or engineering units, the digit or character to enter or edit will blink starting with left-most
position. Use the UP or DN button* to increment or decrement the variable value or character. Use the SEL button* to move the blinking
cursor to the next digit or character. When the entire value has been entered, use the ENT button* to store the programmed value and
advance to the next program variable.
Select LIMIT and ANALOG OUT assignments using the SEL button*. Use the ENT button* to store the assignment and advance to the
next program variable. The ENT button* will exit programming after the last variable has been programmed.
* or magnetic switch in hazardous area with cover closed
KFR – Scaling for display of rate in specific engineering units. Determines display decimal resolution.
Initial value = 100.00 (Hz. w/2 decimals)
KFR= T-base SCALING FACTOR/K-FACTOR
Where T-base SCALING FACTOR=:
100 for eng. units per second
6000 for eng. units per minute
360000 for eng. units per hour
8640000 for eng. units per day
Where K-FACTOR is the avg. number of pulses/ eng. unit of the transducer.
Round result to desired decimal accuracy and enter KFR using only that number of decimal places. Use no more than four digits
regardless of decimal position! Maximum is 65535 with the decimal in any location.
GATE AB – Gate time, .01 to 600 seconds. Display and analog output update time interval. Initial value is 002.00 seconds
SAMPLE A & B - Digital filter on RATE PL, 0 to 253 (0 min., 253 max.) affecting the update of the display and analog output. Initial
value is 010.
ENG UNITS - The desired engineering units for display of rate are programmable using up to four letters. Example: GPM_
KFT – Scaling for display of total in specific engineering units. Determines display decimal resolution.
Initial value=10000. (Pulses w/ no decimals)
KFT = 10000/K-FACTOR
Where K-FACTOR is the avg. number of pulses/ eng. unit of the transducer.
Round result to desired decimal accuracy and enter KFT using only that number of decimal places. Use no more than four digits
regardless of decimal point position! Maximum = 65535 with the decimal in any location.
ENG UNITS - The desired engineering units for display of total are programmable using up to four letters. Example: GAL_
TOTAL RESET – With the cover removed and outside of a hazardous area use MODE/DN button* to view TOTAL, and RESET/UP
button* to reset ...
* or magnetic switch in hazardous area with cover closed
GR TOTAL RESET – With cover open only! Use MODE/DN button and SEL button to view GR TOTAL, press RESET/UP button plus
ENT button. Use SEL button for “Y”, and ENT button to reset and exit.