AW Gear Meters RT-30EX User Manual
RT-30EX
EXPLOSION-PROOF FLOW RATE TRANSMITTER
OperaƟon & InstallaƟon Manual
Rev. 1.7
RT-30EX Flow Transmitter
Operation and Programming Manual
Table of Contents
Safety Definitions and Information ............................................................................................................... 4
Unpacking ..................................................................................................................................................... 4
Product Description ...................................................................................................................................... 5
Screen selection and programming changes ............................................................................................ 5
Hazardous Area Installation Instructions ...................................................................................................... 6
Specifications ................................................................................................................................................ 7
Connections .................................................................................................................................................. 8
Hook-up board layout ............................................................................................................................... 9
Main board layout ................................................................................................................................... 10
Analog output ......................................................................................................................................... 11
Limit & frequency output ........................................................................................................................ 11
Reset input .............................................................................................................................................. 12
Run Mode Screens ...................................................................................................................................... 13
LOGO screen ........................................................................................................................................... 14
RATE screen ............................................................................................................................................ 14
TOTAL screen .......................................................................................................................................... 14
RATE / TOTAL screen ............................................................................................................................... 15
GRAND TOTAL screen ............................................................................................................................. 15
STATUS screen ........................................................................................................................................ 15
ANALOG OUT screen ............................................................................................................................... 16
LIMIT screen ............................................................................................................................................ 16
Control Functions ........................................................................................................................................ 17
Programming .............................................................................................................................................. 19
Entering programming mode .................................................................................................................. 19
Changing values and making selections .................................................................................................. 19
RATE, TOTAL and GRAND TOTAL scaling ................................................................................................ 20
K-factor (scaling factor) ....................................................................................................................... 20
RATE unit ............................................................................................................................................. 20
RATE time base ................................................................................................................................... 20
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RT-30EX Flow Transmitter
Operation and Programming Manual
TOTAL unit ........................................................................................................................................... 21
Analog output scaling ............................................................................................................................. 21
Fixed output source ............................................................................................................................ 21
RATE source ........................................................................................................................................ 22
TOTAL source ...................................................................................................................................... 23
GRAND TOTAL source ......................................................................................................................... 23
LIMIT / Pulse output programming ......................................................................................................... 24
Limit 1 & Limit 2 .................................................................................................................................. 25
Frequency output programming ......................................................................................................... 27
Gate Time filter ....................................................................................................................................... 27
Linearizer programming .......................................................................................................................... 28
Calibrating Analog Output .......................................................................................................................... 30
I/O Manual Adjustment .............................................................................................................................. 31
Analog output adjustment ...................................................................................................................... 31
Fine mA adjustment ............................................................................................................................ 32
Coarse mA adjustment ........................................................................................................................ 32
Limit & frequency adjustment ................................................................................................................ 32
Fine limit output adjustment .............................................................................................................. 33
Coarse limit output adjustment .......................................................................................................... 33
ON/OFF Limit output adjustment ....................................................................................................... 33
Monitor external reset input .................................................................................................................. 34
Appendix A – Physical Dimensions ............................................................................................................. 35
Appendix B – Default Variable Values ........................................................................................................ 37
Appendix C – Revision History .................................................................................................................... 38
Limited Warranty ........................................................................................................................................ 39
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RT-30EX User Manual, Rev. 1.7 02/07/2012
RT-30EX Flow Transmitter
Warning!
Caution
Notice
Caution
Operation and Programming Manual
Safety Definitions and Information
Do not attempt to install or use your AW Gear Meters product until you have read the safety
instructions in this section. Save this manual and keep it in an easily accessible place.
Warning means that failure to follow this safety statement may result in extensive product damage,
serious personal injury, or death.
Caution means that failure to follow this safety statement may result in minor or moderate personal
injury, property or equipment damage.
Notice is a statement that informs about installation, operation, maintenance, performance issues, or
general tips that are important but do not create a hazard or safety concern.
Unpacking
Separate the RT-30EX Flow Transmitter from packaging materials and check for any visual signs of
damage. If you determine there are damages caused by shipping, file a claim with the shipping
company. If the flow transmitter appears to have been improperly assembled or does not operate
properly, return it for replacement or repair (see Limited Warranty information at the end of this
manual).
Before connecting, programming, or operating the RT-30EX Flow Transmitter, read this manual.
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RT-30EX Flow Transmitter
Operation and Programming Manual
Product Description
The RT-30EX is a digital flow transmitter housed in an epoxy painted aluminum instrument enclosure.
The RT-30EX is certified for use in Class 1, Div 1 hazardous areas in both Canada and the US. The
unit’s graphical, backlighted LCD display makes it easy to monitor flow rate and total in user
selectable engineering units. The sensor used with the unit will mount on many meter models
modified for use with the 3/8” NPT sensor mounting thread. Meter model available are the JVM, JVS,
JVHS and ZHM gear meters and HM high pressure turbines.
Screen selection and programming changes
You can make program or mode changes, or reset the totalizer in two ways;
1. With the housing cover removed, enter information using the 4 pushbuttons
2. With the housing cover closed, hold the attached magnet wand against the side of the cover
to activate hall switches located on the internal circuit board.
You can also reset the totalizer and monitor flow rate limits and total output remotely via a computer
or PLC.
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RT-30EX Flow Transmitter
Warning!
Warning!
Warning!
Figure 1: Hazardous area certification tag
Operation and Programming Manual
Hazardous Area Installation Instructions
The RT-30EX unit is an explosion-proof flow transmitter with local display which may be used in Class 1,
Div 1 locations. Above is a sample of the name plate that should be clearly attached to each unit.
Please make sure this name plate is on the unit and that the information matches what is shown above,
prior to installation. If either the name plate is not on the unit or the unit name plate does not match
what is shown above, please notify AW-Lake Company to determine appropriate course of action.
Because the RT-30EX uses an explosion-proof enclosure for its area protection, power must be removed
from the unit before the covers are removed while in a hazardous area. Also, disconnect power before
loosening or adjusting the swivel collar on the hub adapter.
For proper installation, it is also necessary that the conduit entries are properly sealed. To maintain the
unit’s explosion-proof certification, anything threaded into the NPT conduit openings must engage by a
minimum of 5 full threads. If original units received from AW-Lake Company are versions which have
the sensor installed, this sensor will be properly installed with a minimum of 5 full threads of
engagement from the factory.
When an RT-30EX is installed into the flow meter with which it is to be used, it is also necessary to make
sure there is a minimum of 5 full threads of engagement between the meter and RT-30EX unit.
When wiring the unit, please make sure to observe any local codes that may be required. A common
requirement is to have a conduit seal within 18 inches of the unit. Also, the unit may be used in a Class
I, Div. II area, but must still be installed according to Class I, Div I standards. Make sure units are
powered by a Class 2 power supply for proper regulation.
Please note that the RT-30EX must be installed properly into a flow meter before power is applied.
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RT-30EX Flow Transmitter
Operation and Programming Manual
Specifications
Power Requirements: 9-24 VDC/200mA, Class 2 (customer supplied)
Sensor/Monitor Input Ratings:
o Frequency Input Range: 0.3-4,500 Hz
o Sensor Supply Voltage: 12 VDC @ 50mA Max.
o Magnetic Sensor Input: 15mV
o High Level Pulse Input: 2V
P-P
Min., 24V
PEAK
Min., 24V
PEAK
Max.
PEAK
Max.
Analog Output 4-20 mA: 16-bit isolated loop powered 2-wire output; 9-24 VDC, Class 2 loop
supply; max. load impedance = 500 Ohm @ 24V; max. load impedance = 250 Ohm @ 12V
Three Opto-Isolated Open-Collector Outputs: 5-30 VDC, Class 2 rating, 40 mA Max.
(minimum load impedance required = 600 Ohm @ 24 VDC)
Opto-Isolated Reset Input: 12-24 VDC Input, Class 2, 3.3Kohm Impedance
Temperature Ratings: -4 to 140°F (-20 to 60°C) ambient; 185°F (85°C) max. fluid
temperature (standard); 350°F (175°C) max. fluid temperature with optional high
temperature pickup version.
Enclosure Certification: Type 4X
Connection: spring terminal strips; ¾" NPT conduit entrance
Display update rate: 250 milliseconds (4 times per second)
Analog output update rate: 20 milliseconds (if Gate Time filter off)
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RT-30EX Flow Transmitter
Operation and Programming Manual
Connections
On dual access enclosure versions, the hook-up board can be accessed by removing the blind cover.
To get access to the hook-up board on the single access enclosure models, first remove the cover and
loosen the 4 stainless steel screws visible through the face plate as shown in Figure 18. Note that the
screws are captured on the back side of the main display board and will not fall out. Carefully remove
the main display board. The hook-up board is located at the bottom of the enclosure as shown in Figure
2 below.
Figure 2: Single access enclosure model, hook-up board location
To get access to the sensor wiring terminal which is located on the back of the main display board, the
same procedure must be followed for both the single and dual access enclosure models.
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RT-30EX Flow Transmitter
Figure 3: Hookup board connection diagram
Operation and Programming Manual
Hook-up board layout
Maximum wire gauge: 16 AWG
Pin 1: (+) Reset
Pin 2: (-) Reset
Pin 3: (+) Frequency Out
Pin 4: (-) Frequency Out
Pin 5: (+) Supply Voltage
Pin 6: (-) Supply Voltage / Ground
Pin 7: Housing Ground
Pin 8: +Vcc
Pin 9: mA Loop Output See Figure 5 & Figure 6 on page 11 for mA signal polarity
Pin 10: mA Loop Output
Pin 11: (+) Limit 1
Pin 12: (-) Limit 1
Pin 13: (+) Limit 2
Pin 14: (-) Limit 2
NOTE: See page 7 for electrical specifications
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RT-30EX Flow Transmitter
Figure 4: Main board input signal connection
Operation and Programming Manual
Main board layout
Maximum wire gauge: 12 AWG
Pin A: Magnetic Coil input
Pin B: Magnetic Coil input
Pin C: Ground
Pin D: High level pulse Input
Pin E: (+) 12Vdc Output for sensor supply
NOTE: See page 7 for electrical specifications
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RT-30EX User Manual, Rev. 1.7 02/07/2012
RT-30EX Flow Transmitter
OPTO-
ISOLATOR
50mA Polyfuse
3, 11, 13
4, 12, 14
(+)
(-)
R sense
ANALOG
CIRCUIT
0.01uF
9
10
5
6
SUPPLY
VOLTAGE
9-24 Vdc
(Class 2)
(+)
(-)
9-24 Vdc
(Class 2)
(+)
(-)
RT-30EX
Figure 5: Loop powered analog output
Figure 6: Ground referenced analog output
Figure 7: Limit1, Limit 2 & Frequency outputs
R sense
ANALOG
CIRCUIT
0.01uF
9
10
5
6
SUPPLY
VOLTAGE
9-24 Vdc
(Class 2)
(+)
(-)
RT-30EX
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Operation and Programming Manual
Analog output
The isolated 16-bit 4-20mA output can be wired for use with Loop powered inputs or for ground
referenced inputs. The analog signal has an LED in series which varies in intensity as the mA signal
varies. This can be used for troubleshooting purposes.
When using the analog signal with inputs used with loop powered signals, it is important to note that
the RT-30EX still requires a separate power supply to power the unit as shown Figure 5 below.
When using the analog signal with ground referenced inputs, jumper pins 8 and 9 together as shown in
Figure 6 above. Analog signal is taken from pin 10 and returns to pin 2 (supply ground).
Limit & frequency output
Three opto-isolated NPN open-collector outputs can sink or source depending on connection. Attention
must be paid to polarity of connections. See page 7 for electrical specification and page 9 for Limit 1,
Limit 2 & Frequency pin-out pairing.
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RT-30EX Flow Transmitter
1
2
3.3Kohm
12-24 Vdc
(Class 2)
(+)
(-)
RT-30EX
MOMENTARY
SWITCH
OPTO-
ISOLATOR
Figure 8: External reset input
Operation and Programming Manual
Reset input
Opto-isolated external reset input will trigger the RT-30EX to reset the totalizer when the input sees a
momentary transition from low (ground) to high (near supply).
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