GPI Flomec RT14 User manual

RT14 Flow Rate Totaliser
Instrucon Manual
Version 21.16

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General Information
This manual provides the necessary information for installation and operation of
your flow instrument; for detailed information on any flowmeters or accessories
supplied with your instrument please consult the relevant flowmeter product
manual. This instrument should only be installed and maintained by persons
familiar with local regulations, particularly those for workplace Health and Safety.
For best results, please make yourself familiar with the contents of all relevant
product manuals prior to installation and commissioning. If further assistance is
required please consult the distributor from whom you purchased your device.
DISPOSAL WITHIN THE EUROPEAN UNION - WEEE
•
The WEEE Directive requires that this product be recycled
when disposed of within the European Union
•The crossed out wheelie bin symbol shown in this manual
signifies that this product should not be disposed of in general
waste or landfill.
•Please contact the local dealer or national distributor from
whom this product was purchased for information on recycling
electronic equipment within your region.

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Table of Contents
1. Introduction...................................................................................................4
1.1 Product Overview.............................................................................................4
1.2 Specifications...................................................................................................5
2. Operation.......................................................................................................6
2.1 LCD Display ......................................................................................................6
2.2 Keypad Function ..............................................................................................7
2.3 Operating Functions ........................................................................................8
3. Mechanical Installation ................................................................................13
3.1 General Requirements ...................................................................................13
3.2 Conduit Entries...............................................................................................13
3.3 Integral Meter Mounting...............................................................................13
3.4 Wall and Pipe Mounting ..............................................................................14
3.5 Panel Mounting ...........................................................................................14
4. Electrical Installation....................................................................................15
4.1 Terminal Identification ..................................................................................15
4.2 Input Connections ..........................................................................................16
4.3 Output Connections .......................................................................................18
4.4 Connections for Combined Outputs...............................................................23
5. Programming Parameters ............................................................................24
5.1 PIN Program Protection.................................................................................24
5.2 Engineering Units...........................................................................................24
5.3 Time-base for Rate.........................................................................................24
5.4 Decimal Places...............................................................................................25
5.5 K-Factor Entry ................................................................................................25
5.6 Input Type Configuration ...............................................................................25
5.7 Non-Linearity Correction................................................................................25
5.8 Digital Output ................................................................................................26
5.9 Analogue Output ...........................................................................................27
5.10 Advanced Menu .........................................................................................28
6. Programming Flowchart...............................................................................30
7. Program Detail Record .................................................................................33
8. Spare Parts...................................................................................................34
9. Manufacturer’s Declaration .........................................................................36

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1. Introduction
1.1 Product Overview
The RT14 Rate Totaliser is designed for computing, displaying and transmitting totals and
flowrates from a flowmeter with a pulse or frequency output. The instrument will display Flow
Rate, Total and Accumulated Total in engineering units as programmed by the user. Simple
flow chart programming with scrolling English prompts guides you through the programming
routine greatly reducing the need to refer to the instruction manual. All user program data is
retained if the battery is removed.
Environments
The instrument is weatherproof to IP66/67 (Nema 4X) standards; a UV resistant glass
reinforced nylon housing with stainless steel screws & a mix of Nitrile O-ring seals and
Polyurethane gaskets allow the instrument to maintain its environmental protection across a
wide operating temperature range. The instrument suits harsh indoor and outdoor
environments & conforms to the European Directive for Electro Magnetic Compatibility.
Features
Displays of Total, Accumulated Total, and Flowrate, 10 point Linearisation, PIN Protection,
4~20mA analogue output, selectable digital output for pulse output or High / Low flow alarms.
Installation
Specifically engineered to be directly mounted on a variety of flowmeters, wall or surface
mounted, pipe or panel mounted. Various mounting kits are available. The instrument can be
self-powered or may be powered by an external DC supply or by a 2-wire analogue loop.

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1.2 Specifications
Physical
High impact glass reinforced Nylon (PA6) with a Polycarbonate lens, Nitrile O-Ring
seals and Polyurethane gaskets, providing an IP rating of IP66/67
Operating Temperature Range is -30
o
C ~ +80
o
C (-22
o
F ~ +176
o
F)
LCD
Display:
8 digit alpha-numeric LCD display with 12mm characters
Display backlight available with external DC power
Units
Total units are selectable for litres, millilitres, gallons, cubic metres, quarts,
kilograms, pounds, or NONE.
Rate units are independently selectable for all of the above, with time-base options
of /second, /minute, /hour, or /day
Signal
Input:
Universal pulse/frequency input compatible with Reed Switch, NPN or PNP sensors,
Variable Reluctance Coils (Turbine Flowmeters), and Weigand Sensors (voltage
pulse signals). 1.2Khz maximum input frequency for NPN/PNP, 2kHz maximum for
Coil inputs, 120Hz maximum for Reed Switch inputs.
Minimum signal amplitude for Coil signals is 90mV pk-pk
Sensor
Power
5V/20mA regulated sensor supply is available with external DC power applied.
A separate low power sensor supply is available when loop powered
Battery
Power
AA 3.6V Lithium Thionyl Chloride Battery
Expected battery life under ideal conditions is 5 years
See section 2.3.11 for more details on battery life
External
DC Power
Regulated 12V ~ 30V DC
Maximum current draw on external power is 100mA @ 30V
Lower current supply is required with lower supply voltages
Loop
Power
12 ~ 30V DC 2-wire loop power
Load Limits:
@ 30VDC – 900Ω Max @24VDC – 630Ω Max @12VDC – 90Ω Max
Analogue
Output
12 Bit 4-20mA analogue signal with an accuracy of ±0.05% F.S. at 25oC
±0.25% F.S. at extreme ambient temperatures (-30oC or +80oC)
Software setting of Zero and Span, software trim of zero and full scale
22mA over-range when full-scale flowrate is exceeded
Digital
Output
One selectable digital output programmable for Scaled Pulse, Unscaled Pulse, High
Alarm, Low Alarm, or High/Low Alarm.
100Hz Maximum output frequency for scaled pulse or alarms.
Signal accessible via passive NPN output or isolated output
Passive
NPN Out
Passive NPN digital output, 30VDC 300mA maximum
Can be operated on battery power with a reduced battery lifetime
See section 2.3.11
Isolated
Digital Out
Isolated digital output which is NPN/PNP selectable via wiring.
50V AC/DC 300mA maximum
*requires external DC power to operate*

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2. Operation
2.1 LCD Display
The presence of an input signal is indicated by movement of the flow indicator (propeller) in
the bottom left of the display. At low input frequencies the flow indicator will move upon
receipt of each individual input pulse, and at higher input frequencies it will rotate at a fixed
speed.
The LCD display will update with a frequency of 1Hz when the instrument is operating on
battery power; this will increase for a period of 30 seconds following a button press to 8Hz for
totals and 4Hz for flowrate. When powered by external DC or Loop power the LCD will update
at a constant 8Hz/4Hz.
Upon entering the programming mode
the LCD will conduct a display test
where all LCD segments are displayed
for 3 seconds
Rate display is indicated by the RATE
flag in the bottom row of the display.
8 digits are available for Rate display,
user selectable for up to 3 decimal
places.
Rate units and time-base are displayed
at the top of the display. Rate units
may differ from Total units (e.g. Litres
and mL/min)
Total display and Accumulated Total
displays are also indicated clearly with
identifiers shown in the bottom row of
the display.

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2.2 Keypad Function
KEY
FUNCTION IN OPERATING MODE
FUNCTION IN PROGRAM MODE
Press and hold for 3 seconds to
reset the Total display to zero.
Total must be displayed on LCD
display to reset it
Selects the digit to be
incremented/edited, moves the
curser to the right.
Press and hold to display the
software version (tag number is
displayed if enabled)
Each press progresses to the next
program step.
Holding for 3 seconds will save all
program settings and exit to
operating mode.
Press and hold to display the
accumulated total. Holding this
key for 10 seconds will latch the
accumulated total display.
Increments the selected digit
Toggles between the Rate and
Total displays
Moves one step backwards in the
program
+
Press and hold both buttons
simultaneously for a duration of
5 seconds to enter the
programming mode
No Function
+
Press and hold PROG/ENTER and
then press RESET to toggle
between displaying software
version, serial number, and tag
number (if tag no. is enabled )
No Function
+
+
Press and hold for 7 seconds to
perform a hard restart of the
software. To be used in the case
of ‘frozen’ software which may
be caused by user faults such as
short circuiting of the instrument.
*CAUTION*
Press and hold for 7 seconds in
Programming Mode to wipe all
settings from the device and
reset to factory default settings.
Record all important settings
before resetting the instrument.

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2.3 Operating Functions
2.3.1 Resettable Total
The display toggles between Rate and Total displays when the RATE/TOTAL key is pressed.
Pressing the RESET key and holding for a period of 3 seconds while the Total is displayed on
the LCD will cause the Total to reset to zero.
2.3.2 Accumulated Total
The Accumulated Total is displayed momentarily whenever the ACC.TOTAL key is pressed,
holding the key will hold the Accumulated Total display. If permanent display of the
Accumulated Total is required, this can be achieved by pressing and holding the ACC.TOTAL
key for a period of 10 seconds. Once this is done the Accumulated Total display will latch every
time the ACC.TOTAL key is pressed; to revert the Accumulated Total display to a momentary
display hold the ACC.TOTAL key again for 10 seconds.
The Accumulated Total display can only be reset by entering into the Programming Mode
and progressing to the Accumulated Total Reset function in the Advanced Menu. Protection of
the Accumulated Total reset can be achieved by PIN protecting the Programming Mode.
2.3.3 Rate Display
The Flow Rate Display is toggled by pressing the RATE/TOTAL key; Rate display remains
active until the RATE/TOTAL key is pressed again. The update frequency of the Rate display is
influenced by two parameters; the update frequency of the display (1Hz on battery power, 4Hz
on external DC or loop power), and the Rate Calculation Pulses parameter. If the update
frequency of the Rate Display is too slow consider reducing the number of pulses for the rate
calculation (see section 5.10). Conversely if it is required to stabilise an erratic Rate Display,
increasing the Rate Calculation Pulses parameter will achieve this.
Other parameters which influence the Rate Display are the Rate Damping, and Low
Frequency Cut-Off settings. Rate Damping will smooth out rapid changes in the flow rate in
order to maintain a steady display, however in systems where fast changes in the flowrate
must be displayed the Rate Damping parameter should be minimised.
The minimum input frequency requirement for a Rate Display is 0.2Hz with the factory
settings; this can be reduced to 0.1Hz by adjusting the Low Frequency Cut-off parameter. Note
that Totalisation is not effected by the Low Frequency Cut-off parameter.

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2.3.4 Display Backlight
The display backlight will be automatically enabled upon connection of an external DC
voltage supply in the range of 12-30V; the backlight is not available when operating on battery
or loop power. If it is required to reduce power consumption while operating on external DC
power the backlight can be overridden in the Advanced Menu (see section 5.10).
2.3.5 Analogue Output
The loop powered 4-20mA Analogue Output is a passive non-isolated output capable of
retransmitting the flowrate to remote instrumentation or control systems such as a PLC or
DCS. The Analogue Output can be spanned anywhere within the operating range of the
associated flowmeter; both the 4mA and 20mA points are software programmable in the units
selected for the Rate display. The instrument will over-range to 22mA which allows the user to
identify when the system is exceeding its maximum normal flowrate (i.e. identifying a fault
condition).
The Analogue Output accuracy is ±0.05% of Full Scale (0.01mA) at a regular ambient
temperature of 25oC. Due to the effects of temperature changes on the internal components,
the accuracy will become progressively worse as the ambient temperature moves further
away from 25oC; up to a worst case of ±0.25% of Full Scale (0.05mA) at the extremes of the
instrument’s operating range (-30oC or +80oC)
If required, the Analogue Output can be software adjusted to achieve the best accuracy
under the specific operating temperature of your installation. The 4mA and 20mA points are
both adjustable in 0.001mA increments by accessing the Analogue Output Adjustment section
of the Advanced Menu (see section 5.10 of this manual).
2.3.6 Unscaled Pulse Output
The Unscaled Pulse Output function is used to retransmit the input signal from the
associated flowmeter; it will maintain the same frequency and duty cycle as the input signal.
When setting up a system with two separate Total displays on two separate instruments the
Unscaled Pulse Output is the best method of transmitting the Total value to the secondary
totalising instrument.
The Unscaled Pulse signal can be transmitted as an NPN signal from the passive digital
output, or as an NPN or PNP signal from the isolated digital output. The passive digital output
can be used on battery power, however transmitting the signal via the isolated output will
require an external DC power supply.

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2.3.7 Scaled Pulse Output
The Scaled Pulse Output is used to transmit the totalised volume at a user selectable
resolution; this is programmed as a volume quantity per output pulse (e.g. 10Litres/Pulse or
100mL/Pulse). The frequency of the Scaled Pulse Output signal automatically adjusts according
to the input frequency and the scale factor, up to a maximum limit of 100Hz.
The Scaled Pulse signal can be transmitted in the same way as the Unscaled Pulse signal
above, either through the passive or isolated output.
The pulse width of the Scaled Pulse output is fixed at 300ms for output frequencies below
1.67Hz, however once above 1.67Hz the instrument adjusts the pulse width according to the
frequency to give a 50:50 duty cycle up to the maximum output frequency of 100Hz. Systems
should be designed to stay below the 100Hz limit, however if 100Hz is exceeded the
instrument will output at 100Hz and store any excess pulses in memory. Pulses stored in
memory will continue to output after the flow has stopped until the stored pulse count
reaches zero.
2.3.8 Alarm Output
Flow Rate Alarms may be programmed for High, Low, or High/Low; the digital output will
trigger when the registered flowrate passes the configured set-point(s). For a Low Alarm the
output will trigger once the flowrate drops below the set-point, a High Alarm will trigger with a
flowrate over the set-point, and a High/Low alarm will trigger if the flowrate is either over the
upper set-point or below the lower-set point.
Each set-point is configured with its own dead-band percentage which allows the user to set
a buffer zone (hysteresis) to avoid alarm “chattering” (switching quickly on-off-on-off) with a
flowrate hovering around the set-point. The dead-band setting is entered as a percentage of
the set-point value; e.g. a 5% dead-band with a 100L/min High Flow Alarm will trigger ON at
100L/min but will not turn OFF until the flow drops to below 95L/min.
Alarm Outputs can operate as an NPN signal via the passive digital output, or as a PNP or
NPN signal via the opto-isolated output. For relay switching be sure to follow the requirements
in the relevant wiring diagram in section 4.3.
2.3.9 Passive NPN Transistor Output
The passive NPN transistor output is the default method of transmitting the pulse or alarm
outputs, as it is the easiest and lowest cost solution where an NPN signal below 30VDC is
suitable. The passive NPN output shares a common ground inside the instrument, so may not
be suitable for installations requiring an analogue output in combination with a digital output,
as it may cause analogue signal issues due to the formation of a ground loop.