Instruction Manual

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Fisherr HF340 Filter

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

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

March 2015

Summary of content (4 pages)

PAGE 1
Instruction Manual HF340 Filter D102796X012 March 2015 Fisherr HF340 Filter 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.
PAGE 2
Instruction Manual HF340 Filter D102796X012 March 2015 Table 1. Specifications Mounting Standard 35 mm DIN rail mounting with filtering components. 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.
PAGE 3
Instruction Manual HF340 Filter D102796X012 March 2015 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.
PAGE 4
HF340 Filter March 2015 Instruction Manual D102796X012 Shields If using shielded wiring on both sides of the filter, the shield should connect across the filter. If the filter connects directly to the control system output and shielded loop wiring is being used, connect the shield to system ground on the instrument side of the filter. HART Wiring Connections The COMM terminals on the filter provide a convenient means to tap into the loop wiring for HART communication.