Kurz 504FTB Manuale utente
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 1
Installation
Figure AH-1 504FTB and 534FTB with venturi flow conditioner.
WARNING: Your warranty will be voided if your unit is not installed in accordance
with this user’s guide. Make sure you read and thoroughly understand the
installation portion of this guide before you attempt to install your unit. If you
have any questions, contact your Kurz customer service representative before
attempting installation.
Mounting
The 504 and 534FTB In-line flow transmitters are generally mounted with a flange pipe
fitting but thread is sometimes used on smaller line sizes. See the product brochures
(DCN 367524 for the 504FTB and DCN 360723 for the 534FTB) for Kurz mounting
accessories. It is important for the mounting design to consider the force that will be
exerted on the flow body from the piping. It is best (often required by the plumbing
code) to support the process piping on both sides of the flow meter so it may be
removed without the piping bending or moving much making it hard to re-install.
Flow Body Location and Orientation:
The In-Line flow meters are available for ½” to 6” piping. The principle difference
between the 504FTB and 534FTB is the type and efficiency of flow conditioner which
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 2
can be seen in the two photographs shown above.
•504FTB has only a small perforated plate flow conditioner. Requires straight
runs in the 15 to 40 D range to obtain field data with-in 2% of the laboratory
calibration. So field calibration may be needed depending on the accuracy
needed.
•534FTB has a venturi flow conditioner. This has no straight run requirements to
be within 2% of the laboratory calibration. Field calibration is generally not
needed.
The quick start guide shows this very clearly in the second figure for in-line meters. In
addition to what is shown here, the double elbow case not shown, will introduce swirl
that can further aggravate the data and straight run length requirements.
Horizontal Mounted Meters
Any orientation works fine.
If there is condensate running along the bottom of the pipe, the sensor will last
longer if its electronics head is vertical up tilting down to no more than to 8 AM or
4 PM positions.
Vertical Mounted Meters
Flow going up works well under all conditions
Flow going down works well except near the zero flow region, below 50 SFPM or
0.25 SMPS.
High Dew Point applications
If the application is near the dew point, it will condense inside the pipe walls when
the gas is cooling as it flows along. Insulating the piping will reduce the condensate on
the inside walls. In these cases, it is best to mount the sensor from the bottom at about
7:30 or 4:30. Vertical from the top can cause water to flow on to the stings, or if
mounted from the bottom the condensate will aggravate sting corrosion. Condensate
(water or other liquids) on the sensor will cause false high flow readings while the
sensor evaporates the liquid.
Hot or cold process fluid
Insulation on the piping will reduce any temperature gradients that will introduce
a false high or low reading. Hot fluid in a pipe with cold walls will tend to read low for
sensors which are center line mounted and read high for Cold fluids in a warmer
ambient.
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 3
Pump or Fan inlets
Vacuum or pump inlets from ambient air can result in extra sensor cleaning
schedules to remove dirt build up. The fan inlet is often below atmospheric pressure
and when the humidity is near 100% there will be condensation formed at these
locations. The condensate will allow dirt to stick to the sensor more than in the absence
of condensate. A better solution is to place the flow meter after the fan or pump where
the pressure is higher, thus the relative humidity will be lower and avoid condensation
and dirt sticking to the sensor.
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 4
1. ¾” FNPT Sensor support port
(TA or Transmitter Attached
version)
Conduit or cable port (TS or
transmitter separate version)
2. Backlit 2x16 LCD and 20 key
button interface
3. ¾” FNPT signal and power
conduit ports.
4. Safety Label and Product ID
tag.
5. Main I/O wiring terminal block
for sensor, power, RS-485 and
4-20 mA outputs, TB1
6. AC power input. 85 to 265
VAC 50/60 Hz. 1 phase.
7. Power indicator: Green LED,
right side of TB1
8. USB mini-B connector
9. Optional hardware, AI, DO, DI,
Purge valve, I/O connector
TB6
10. External and internal ground
lug locations. Shielded wire
pig-tail termination location.
7
Figure AH-2. Location of major components
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 5
Electronics Head Orientation
The electronics head is provided in two standard orientations compared to the sensor
flow arrow or flow direction. When looking at the display and the flow is to the right, this
is the normal configuration (see figure AH-1) and flowing to the left is reverse. This
option is selected in the model part number when the unit is ordered.
Rotating the head in the field can damage the sensor wires and result in a loose
connection which results in water leakage or other warrantee and hazardous area
safety violations.
TS Version
For transmitter separate versions (TS) there are two enclosure groups. The sensor
enclosure mounts as described above and contains just a sensor wire terminal board.
Sensor Wires
Figure AH-3. Sensor electronics enclosure and sensor J-box with covers removed
The electronics enclosure contains the sensor control board, optional AC power supply
and LCD/keypad and is mounted via the pipe nipple as shown in Figure AH-4. Two U
clamps around the pipe nipple to a metal mounting adaptor (Optional Kurz part #
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 6
700494-) frame or pipe stand are sufficient. It is important to know that the sensor serial
number must be matched with the same serial number electronics unit. These two
parts are not interchangeable unless the electronics configuration file is matched with
the sensor serial number.
Power and Signal wires. 2x
¾” conduit ports
Conduit seal for
Ex applications
Sensor Wire
Port: ¾” NPT
Figure AH-4. Examples of Unistrut and Pipe mounting of the TS configured electronics
using the optional mounting kit, 700494-.
Field Wiring
Proper wiring installation of the MFT B-Series flow transmitters may include some or all
the flowing issues:
•Safety Grounding and Explosion-Proof enclosure connections.
•Water ingress protection
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 7
•DC or AC power requirements and connection.
•Analog Output configuration and wiring of the 4-20 mA signals.
•Discrete Alarms
•Purge sensor air solenoid
•Zero/Mid/Span daily drift test (EPA 40 CFR part 60 or 75 support)
•Serial Digital Interface
•5-wire sensor connection for the TS configuration
•Clip-on Ferrite for all signal wires if not in shielded conduit
•Flex service connection to sensor probe support.
Please read the complete text of the sections and study the wiring diagram examples
which are relevant to your model before performing the installation.
Safety
To ensure compliance with General Safety requirements the metal enclosures must be
grounded to minimize the chance of electrical shock. For Explosive Atmospheres,
proper grounding minimizes the chance of sparks occurring, potential ignition sources,
outside an enclosure at its mechanical interfaces if a fault current was to flow. Both
internal and external grounds are available; see the wiring diagrams DCN 342038 and
342039.
For hazardous gas areas, wiring going into and out of the explosion-proof enclosures
must be done through a conduit seal or cable gland rated for explosion-proof
applications (Class 1 Div. 1 or Zone 1) attached directly to the enclosure. See Figure
AH-4. These seals are not needed for non-incendiary designs (Class 1 Div. 2 or Zone
2).
For hazardous areas it is important to not connect or disconnect any
wiring when the circuits are energized, the resulting spark could
cause ignition.
Three 3/4" FNPT fittings are provided on the electronics enclosure. The one pointing out
radially is used for the sensor probe support or its wiring in a TS configuration. The other
two ports exiting opposite the sensor port are for power and signal wiring. One port is
typically used for AC power and the other for the signal wires. DC powered models can
use both ports for signal/power wiring. Consult your local electrical code for installation
requirements.
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 8
Water Ingress Protection
The leading cause of a malfunctioning flow transmitter is water penetration in to the
sensor electronics or wiring terminals. The electronics enclosures have a NEMA 4X or
IP66 rating but the transmitters are still subject to water damage if not properly installed
and maintained.
Protective measures for keeping water out of the flow transmitter components.
•Installation of conduit seals (Ex type potting Y work well) near the enclosures on
all ports.
•Most cable gland designs not only provide for shielded cable termination but an
environmental seal against dirt and water.
•Routing of conduit or cable using a water loop and drain near the enclosure ports
•Keep the enclosure lids on tight using the supplied o-rings.
•Positive pressure dry purge air to the enclosure will keep condensation out (few
PSI from a regulator).
Conformal coating of the circuit boards is standard but this only protects against
condensation of trapped water vapor which forms from cooling inside the
enclosures/conduit. Every 10 minutes a sensor and wiring leakage test is performed.
This will set an alarm (Modbus, LCD and NE-43) when excessive leakage is observed.
Flex Wiring Connection for Sensor Inspections
To support periodic and preventative maintenance, the sensor electrical connections
should be done with extra cable or flex conduit length. This allows the sensor to be
removed from the process for inspection and or cleaning without disconnecting the
wiring. The transmitter attached (TA) versions have only power and 4-20 mA wires are
being routed out and use standard electrical wring practice as shown in Figure AH-5.
However, the trouble is maintaining the EMC requirements on the wiring at the same
time. If we are using a transmitter separate (TS) version, the sensor is remote from its
electronics, we must use an approved shielding method. The 5-wire sensor connections
are described in a later section.
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 9
Figure AH-5. Flex sensor connection for
service loop, TA version using Liquid Tight
Conduit.
Approved EMC tight flexible, shielded electrical connections for the TS 5-wire sensor
wiring
•Braid reinforced pneumatic hose; Hydraulic line hose
•Corrugated Stainless Steel tubing, with compression fitting at each end. Gas
appliance flex fittings may be long enough and are available at local home
improvement outlets.
•Braded Shielded cable with peripheral bonded shield cable glands
Figure AH-6. Metal Braid Hydraulic Lines, corrugated gas appliance line and braided
shielded cable all work well for EMC shielding of 5-wire sensor connections.
Kurz Instruments Inc. December 13, 2007
360210-AH Rev.A 504/534FTB Installation AH - 10
Do not use Liquid tight Flex conduit for 5-wire sensor connections, shielding is not
effective.
Typical Hook-Up Wiring Diagrams
For both the AC & DC powered versions of the MFT B-Series, typical summarized wiring
diagrams for most applications are available as defined in DCN 342038. This covers the
TS and transmitter attached (TA) configurations. Examples for 4-20 mA connections and
Modbus are shown along with the terminal definitions and cable wiring notes.
For the transmitter separated (TS) enclosure configuration, the 5-wire sensor
connections must be made as shown in DCN 342039. The connection between the
enclosure groups must be shielded to maintain the CE rating.
24 VDC Powered Flow Transmitters
The 24 VDC power is a nominal voltage since all circuits have a regulated supply and will
work between 18 and 30 VDC. You may also use an unregulated power supply with 50
to 60 Hz ripple as long as the instantaneous voltage is between 18 and 30 VDC.
Surge currents during sensor warm up could require up to 1 A and will fall off after it
warms up in about 20 seconds. At no flow the current will be about 0.1 A and about 0.3
A for high flow rates (12,000 SFPM). The power is protected against reverse polarity so
if no current flows or there is no output signal you may want to check the polarity against
the wiring diagram, DCN 342038.
The flow transmitter is grounded. The 24 VDC power and 4-20 mA signal have MOVs
(metal oxide varistors) to clamp voltage spikes going into the unit. These are 56 V
nominal (voltage level at 1 mA) and do not conduct significant current below about +/- 36
VDC relative to ground. Consequently, the isolated 4-20 mA signals, alarms etc., can
not have a significant common mode or bias voltage to prevent leakage currents on the
MOVs, which can cause an error in the flow measurement if occurring on the 4-20 mA
output.
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