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Fisherr HF340 Filter
Introduction
Scope of Manual
This instruction manual includes installation and maintenance information for the HF340 HARTr filter (see figure 1).
Refer to separate manuals for additional information on other products used with the HART filters, such as FIELDVUEt
DVC6200, DVC6000, or DVC2000 digital valve controllers.
Control system refers to a distributed control system (DCS), programmable logic controller (PLC), or a stand‐alone
controller that provides a control signal to the FIELDVUE instrument.
Do not install, operate, or maintain an HF340 filter without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all of the contents of this manual, including all safety cautions and warnings. If
you have any questions about these instructions contact your Emerson Process Management sales office before
proceeding.
Figure 1. Fisher HF340 HART Filter
FIELD INSTRUMENT
CONNECTIONS (FLD)
HART COMMUNICATION
CONNECTIONS (COMM)
CONTROL SYSTEM
CONNECTIONS (SYS)
W8283-1
Instruction Manual
D102796X012
HF340 Filter
July 2011
Instruction Manual
D102796X012
HF340 HART Filter
July 2011
2
Table 1. Specifications
Mounting
Standard 35 mm DIN rail mounting with filtering
components.
Connections
Three 2‐pin cage‐clamp style connectors
accept up to 12 AWG wire
Power Requirements
Input Current: 4-20 mA DC (nominal)
Input Voltage: At 20 milliamps DC, 2 volts above
input voltage required by the field instrument (2 volt
drop across filter at 20 milliamps DC)
Ambient Operating Temperature
-40 to 85_C (-40 to 185_F)
Ambient Relative Humidity
5 to 95%
Electromagnetic Compatibility
Meets EN 61326-1 (First Edition)
Immunity—Industrial locations per Table 2 of
the EN 61326-1 standard. Performance is
shown in table below 2.
Emissions—Class A
ISM equipment rating: Group 1, Class A
Dimensions
75 mm (3 inches) long by 12.5 mm (0.5 inches) wide
by 60 mm (2.4 inches) deep
Approximate Weight
0.1 kg (4 oz)
Option
HF341: Standard 35 mm DIN rail mounting without
filtering components (straight through with capacitor
blocking on COMM terminals)
Table 2. EMC Summary Results; Immunity
Port Phenomenon Basic Standard Test Level Performance Criteria
Enclosure
Electrostatic discharge (ESD) IEC 61000‐4‐2
4 kV contact
8 kV air
A
EM field IEC 61000‐4‐3
80 to 100 MHz @ 10V/m with 1 kHz at 80%
1400 to 2000 MHz @ 3V/m with 1 kHz at 80%
2000 to 2700 MHz @ 1V/m with 1 kHz at 80%
A
Rated power frequency
magnetic field
IEC 61000‐4‐8 N/A
(1)
N/A
(1)
I/O signal/control
Burst IEC 61000‐4‐4 1 kV A
Surge IEC 61000‐4‐5 1 kV (line to ground only, each) A
Conducted RF IEC 61000‐4‐6 150 kHz to 80 MHz at 3 Vrms A
A = During testing, normal performance within the specification limits.
1. Not applicable; only applicable to magnetically sensitive equipment.
Description
The HF340 filter is used with HART communicating FIELDVUE instruments, such as DVC6200, DVC6000, or DVC2000
digital valve controllers. HART filters are used when the instrument is connected to a 4 to 20 mA DC control system
output not designed for the HART (Highway Addressable Remote Transducer) communication protocol. The HF340
provides filtering and isolation between the control system and FIELDVUE instrument.
The HF340 HART filter is a passive device that is inserted in‐line with both wires of a HART 4 to 20 mA DC output loop.
The purpose of the filter is to effectively isolate the control system analog output from modulated HART
communication signals. The filter receives a 4 to 20 mA DC current signal from the control system, which it shunts
with a capacitor and then passes through an inductor. The low AC impedance of the capacitor prevents sudden
changes in the control system current output from interfering with the HART communication. The high AC impedance
of the inductor permits HART communication on the instrument side of the filter. It also prevents the voltage
modulation in the HART loop from being seen by, or having an affect on, the control system output. The filter
introduces a maximum input‐to‐output voltage drop of 2 volts DC at 20 mA.
Instruction Manual
D102796X012
HF340 Filter
July 2011
3
The filter is normally installed near the field wiring terminals of the control system I/O. HART communication is only
possible between the filter and the field instrument and at the filter COMM terminals, but not on the control system
side of the filter. The filter is not designed or intended for use in the process environment. Neither the filter nor its
outputs are approved for hazardous areas. However, a recommended intrinsic safety barrier can be connected
between the FIELDVUE instrument and the filter in intrinsically safe installations. In most cases, if an IS barrier is used,
the filter will not be needed.
Specifications
Typical specifications for the HF340 filter are shown in table 1.
Installation
Refer to figure 2 for typical installations. The HF340 filter mounts on a type 35 DIN rail. To install the filter, provide a
temporary means of process control, then take the loop out of service. Remove the DIN interconnect blocks from the
rail without disconnecting existing wiring. Install the filter on the the rail. Disconnect the wires from the control system
output side of the interconnect blocks and connect them to the SYS terminals on the filter, taking care to maintain
correct polarity. Disconnect the wires from the field side of the interconnect blocks and connect them to the FLD
terminals on the filter, taking care to maintain correct polarity.
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