GPI Flomec RT14 Instruction Manual

RT14 Flow Rate Totaliser
Instrucon Manual
Version 21.16
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

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

Upon entering the programming mode

2.1 LCD Display

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.
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.
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2.2 Keypad Function

KEY
FUNCTION IN OPERATING MODE
FUNCTION IN PROGRAM MODE
Press and hold for 3 seconds to
display to reset it
Each press progresses to the next
operating mode.
Press and hold to display the
accumulated total display.
reset the Total display to zero. Total must be displayed on LCD
Press and hold to display the software version (tag number is displayed if enabled)
accumulated total. Holding this key for 10 seconds will latch the
Toggles between the Rate and Total displays
Press and hold both buttons
+
+
simultaneously for a duration of 5 seconds to enter the programming mode
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 )
Selects the digit to be incremented/edited, moves the curser to the right.
program step. Holding for 3 seconds will save all program settings and exit to
Increments the selected digit
Moves one step backwards in the program
No Function
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 25
o
C. 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 25
o
C; 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.
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The passive NPN output will function on battery power, however this will reduce the battery life of the instrument by approximately 50%. For applications requiring an alarm output which is not triggered often the effect on battery life is expected to be negligible. Internal protection is provided for voltage spikes caused by switching inductive loads (relays, solenoids, etc.) by fitment of an internal flyback (suppressor) diode to the passive NPN output. No additional circuit components are required when triggering a DC relay or DC solenoid with this output.

2.3.10 Isolated Digital Output

The Isolated digital output is provided by means of an Opto-Coupler, which provides a signal with no electrical connections to the other internal circuitry of the instrument. The isolated output should be used preferentially whenever a user requires both an analogue output and a digital output (alarm or pulse signal) to a common receiving instrument; this will avoid the creation of ground loops which interrupt the analogue signal. The isolated digital output is also chosen whenever a PNP signal is required; the configuration of PNP vs. NPN is accomplished via wiring which can be seen in the electrical installation section of this manual (section 4.3). The isolated digital output is rated to 50V AC or DC, and 300mA; so should be used instead of the passive NPN output for switching any loads greater than 30VDC or for switching any low voltage AC loads <50VAC. The isolated digital output is not internally protected from voltage spikes generated by inductive loads such as relays or solenoids, so a diode (1N004 recommended) should be fitted across any inductive DC loads as shown in section 4.3.5. For AC relays or solenoids voltage spike protection should be provided by fitment of a metal oxide varistor fitted in place of the diode (EPCOS SIOV-S05K50 or SIOV-S07K50 recommended).
Where the recommended diode or varistor is not available, a similar component of equivalent specification may be used.

2.3.11 Battery Power

The instrument is powered by a Lithium Thionyl Chloride (Li/SOCl2) AA size battery which is non-rechargeable. When operating under average conditions the instrument is expected to have approximately 5 years of battery life; average conditions are considered to be a reed switch input from a Flomec flowmeter with no outputs used. High input frequencies (~1kHz and higher) from a turbine flowmeter will reduce battery life by around 20%, and operation of a battery powered scaled pulse output will reduce battery life by approximately 50%. When the NPN transistor is used for an alarm with infrequent operation the reduction of battery life may be negligible.
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