Moore Industries HIT, HIX User Manual

May 2016
206-730-00D

HIT/HIX

4-Wire/2-Wire HART® Isolators

Isolators

®

4-Wire/2-Wire

HART

HIT/HIX

4-wire/2-wire HART® Isolators

HIT/HIX

Introduction

The Moore Industries’ 2‑wire, loop powered HIX
HART® Isolator, and its 4‑wire, mains powered
variant, the HIT, are compact, DIN‑rail mounted “loop
add‑ons”. They both are used to break the common
electrical (galvanic) path between a HART transmitter
and one or more receiving devices in a process
instrumentation loop.

About this Manual

Wherever you see a “WARNING”, “Caution” or “Note”
pay particular attention.

WARNING

could injure the operator.

Caution ‑ Hazardous procedure or condition that could
damage or destroy the unit.

‑ Hazardous procedure or condition that

Inputs and Outputs

Input to both the HIX and HIT is HART standard
4‑20mA with digital data superimposed. Both isolators
“pass” the conditioned HART signal through from
transmitter to receiver, and from receiver back to
transmitter. This “signal passing” is operationally
transparent to devices on either end of the loop.

Note:

The HIX and HIT are not HART-addressable

devices. They are “invisible” to the other HART

devices on the loop.

Transmitter Excitation

The 4‑wire HIT is also capable of providing power to
the transmitter it is isolating by virtue of its standard,
24V excitation output.

Note ‑ Information that is helpful for a procedure,
condition, or operation of the unit.

HIT/HIX Description

The HIT and the HIX:

· Safeguard I/O cards from surges, spikes

and transients. Add the 500Vrms isolating

capability of a HART Isolator to a loop to
break the common (galvanic) path that can
pass dangerous overloads from DCS to HART
transmitter to PLC and vice‑versa. This
hazard is common—even when a transmitter
and DCS are supposedly “isolated” already.

· “Isolate” areas of an application. Ease
maintenance complications by using the
4‑wire HIT to maintain secondary loop
integrity while the primary HART master is
down for maintenance.

· Facilitate the “Sharing” of one HART
output—safely—with a secondary control or

recording device.

Power

The HIX is a 2‑wire isolator, drawing power from the
output leg of the loop (typically, the secondary DCS,
PLC, or ESS).

The HIT is a 4‑wire unit. It can be ordered in

congurations that draw power from either external

DC or external AC sources.

Moore Industries offers a complete line of instrument
power supplies ideal for use with the HIT. Ask your
local Interface Solutions Expert for information.

Housing

Both the HIX and HIT are housed in aluminum
DIN‑style housings. Older versions of the product
are housed in high‑impact, thermoplastic cases. The
compact housing styles can be mounted on either
G‑type DIN‑rail or Top Hat DIN‑style rail.

· Eliminate “Bucking” power supply
problems. Whenever more than one

4‑wire device provides power to the loop,
each power source (typically grounded with
differing potentials) vies for control. This
can cause both HART and analog signals to

uctuate, adversely affecting loop reliability

and accuracy.

2 The Interface Solution Experts

1

HART is a registered trademark of the HART Communication Foundation.

4-wire/2-wire HART® Isolators

HIT/HIX

Specifications

Performance

Accuracy: ±0.1% of span
Stability: ±0.2% of

reading per year

Isolation:
HIX: 500Vrms between

Input, Output and Case;
HIT: 500Vrms Between
Input, Output, Case and
Power

Tested To:
HIX: 1500Vrms between

Input, Output and Case for
1 minute;
HIT: 1500Vrms between
Input, Output, Case and
DC Power for 1 minute
(2300Vrms from AC Power
to Input, Output and Case
for 1 minute)

Common Mode
Rejection:

Exceeds 95dB at 60Hz
with a limit of 1500Vrms

Performance

(continued)

Input Impedance:

250 ohms nominal, 100
ohms with -IZ100 option

Input Overrange
Protection:

250% of full scale

Output Current
Limiting: 25mA typical;

30mA maximum

Broken Wire Input:

Output driven <=3mA for
HIX; <=1mA for HIT
TX Power Supply:
24Vdc,±10% @ 24mA
(regulated)
Ripple: <10mV for HIX &
HIT DC power and
<35mV for HIT AC power
when measured;
Across 250 Ohm Resistor.

Burden: 5V, maximum
Load Capability:

Vs – 12Vdc

20mA

Response Time
(analog output):

100msec maximum to
99% of output

Ambient

Conditions

Adjustments

Weight

Specications and information subject to change without notice.

Temperature Range:

-20°C to +85°C
(-4°F to +185°F)

Effect: ±0.007% of
span/°C typical;
±0.015% of span/°C
maximum
Humidity: 5-95%
non-condensing
RFI/EMI Protection: Less
than +/- 0.1% of span error
when tested at 10V/m @
80-1000Mhz ;20V/m @
80-1000Mhz for -RF option

Type: Front panel pots
Span: ±10%
Zero: ±5%

(non-interactive when
span is set first)

HIT: DC 283g (10 oz), AC
425 g (15 oz)
HIX: 198 g (7 oz)

Ordering Information

Unit Input Output Power Options Housing

Unit Input Output Power Options Housing

HIT

4‑wire,
Line‑(Mains)
Powered,
HART Isolator
with Transmitter
Excitation

HIX
2‑wire,
Loop‑Powered,
HART Isolator

When ordering, specify: Unit / Input / Output / Power / ‑Option [Housing]
Model number examples: HIX / 4‑20MA / 4‑20MA / 12‑42DC / [DIN] and HIT / 4‑20MA / 4‑20MA / 117AC / ‑RF [DIN]

4-20mA

4‑20mA into 250 ohms
with HART digital
data superimposed

4-20mA

4‑20mA into 250 ohms
with HART digital
data superimposed

4-20mA

Isolated, 4‑20mA
into ≤1000 ohms
(with 24Vdc, 117Vac,
or 230Vac power);
HART digital data
superimposed

4-20mA
Isolated, 4‑20mA
into ≤600 ohms
(with 24Vdc power);
HART digital data
superimposed

24DC ±10%
117AC 50/60HZ,

±15%
230AC 50/60HZ,
±15%
2 Watts power
consumption

12-42DC

-RF 20V/M RFI/EMI

Immunity @ 80‑
1000MHz, 1KHz AM

-IZ100 reduces the
input resistance to
100 ohms

-LL keeps the output
from going below

3.3mA when the
input goes to 0mA

-IZ100 reduces the
input resistance
to 100 ohms

DIN Aluminum
DIN‑style housing
mounts on 32mm
G‑type (EN50035) and
35mm Top Hat
(EN50022) rails

FLB Flange bracket with
top/bottom mounting holes

DIN Aluminum
DIN‑style housing
mounts on 32mm
G‑type (EN50035)
and 35mm Top Hat
(EN50022) rails

FLB Flange bracket with
top/bottom mounting holes

The Interface Solution Experts 3

4-wire/2-wire HART® Isolators

HIT/HIX

40mm

(1.5 in)

80mm

(3.1 in)

73mm

(2.8 in)

85mm

(3.3 in)

90mm

(3.5 in)

40mm

(1.5 in)

C

L

40mm

(1.5 in)

22mm

(0.8 in)

+IN –IN +IN+TX –IN +DC–DCC

+OUT –OUT

SPAN

ZERO

SPAN

ZERO

+PS –PS

HIX

HIT

Dimensions

HIX

HART
ISOLATOR

SPAN

ZERO

+PS –PS

25mm

(1.0 in)

36mm

(1.4 in)

80mm
(3.2 in)

110mm
(4.3 in)

130mm

(5.1 in)

+IN -IN

HIT

HART
SIGNAL
ISOLATOR

+IN

SPAN

ZERO

+OUT –OUT

AC ACC GND

–

IN

+TX

Figure 1. Dimensions for Aluminum DIN-Housed HIX and HIT HART Isolators

Figure 2. Dimensions of the older legacy HART Isolator Family of Products in ECD Housings

4 The Interface Solution Experts

4-wire/2-wire HART® Isolators

HIT/HIX

Calibration

Current/
Voltage

Calibrator

Adjustable, calibrated to an accuracy of
±0.025% (Moore Industries’ CLC Current Loop
Calibrator or equivalent such as the EDC Model
CRC103 or MV105)

HART Communicator Model 275/375/475
or equivalent. Should be capable of
both reading and simulating a valid HART
signal (and 4-20mA analog signal)

Calibrated, regulated 24Vdc (±10%) source,
nominal, for HIX or dc-powered HIT; calibrated,
regulated 117Vac or 230Vac (±10%) source,
nominal, for ac-powered HIT

250ohm with ±0.01% precision; required only if
using a Voltmeter to calibrate the analog output
from the HIX or HIT (voltage drop across the
precision resistor; 4-20mA=1-5V)

Calibrated to an accuracy of ±0.025%, minimum;
such as Keithley Model 197 or Fluke Model 8840,
8842, or equivalent

Standard (blade) head; head width 3.1mm
(0.125 in), maximum

Device

Specifications

HART

Communicator

Power Supply

Load Resistor

Multimeter

Screwdriver

A

ll referenced product names are the sole property of their

respective manufacturers.

To calibrate the HIX or the HIT, set up the equipment
listed in Table 1 as shown in Figure 3 and Figure 4, as
appropriate.

Procedure

1. Apply the appropriate power to the unit being
calibrated.

Table 1. Calibration Equipment for the HIX and HIT

2. Set the INPUT (current simulator) to 4mA.

3. Adjust the ZERO potentiometer (pot) on the
HIX or HIT front panel until the meter in the
setup reads 1V, ±0.02V.

4. Adjust the INPUT to 20mA.

5. Adjust the SPAN pot on the HIX or HIT front
panel until the meter in the setup reads 5V,
±0.02V.

Note:

HIX and HIT span and zero are non-interactive

as long as zero is set rst.

It is not necessary to repeat steps 3, 4 and 5.

6. Use the HART transmitter simulator to send
data or “a command” to the HART receiver
simulator in the setup.

7. Use the HART receiver to send data or “a
command” to the HART transmitter simulator
in the setup.

8. Repeat steps 2 through 5 while using the
adjustable current source to change the level
of current (staying between 4 and 20mA)

in the setup. Note that the HART trafc is
unaffected by changes in the 4‑20mA owing

through the loop.

The Interface Solution Experts 5

4-wire/2-wire HART® Isolators

HIT/HIX

Figure 3. Setting up to Calibrate the HIT

CURRENT

CALIBRATOR

12-42Vdc

POWER

SOURCE

+

250ohm

4-20mA = 1-5V

+

VOLTMETER

+

–

–

–

OPTIONAL

HART
COMMUNICATOR

OPTIONAL

HART
COMMUNICATOR

HIX

HART
ISOLATOR

SPAN

ZERO

+PS –PS

+IN -IN

AC POWER

SOURCE

(CHECK UNIT

MODEL NUMBER)

117Vac

OR

230Vac

OR

CURRENT

CALIBRATOR

OPTIONAL

HART

COMMUNICATOR

+-

HIT

HART
SIGNAL
ISOLATOR

+IN

SPAN

ZERO

+OUT –OUT

DC DCC GND

–IN+TX

250ohm

4-20mA = 1-5V

VOLTMETER

OPTIONAL

HART

COMMUNICATOR

+–

CURRENT

CALIBRATOR

OPTIONAL

HART

COMMUNICATOR

+-

24Vdc

+

–

HIT

HART
SIGNAL
ISOLATOR

+IN

SPAN

ZERO

+OUT –OUT

DC DCC GND

–IN+TX

OPTIONAL

250ohm

4-20mA = 1-5V

VOLTMETER

OPTIONAL

HART

COMMUNICATOR

+–

Note:
Please refer to Fig 2
for legacy ECD housing
terminal designations

Figure 4. Setting up to Calibrate the HIX

6 The Interface Solution Experts

4-wire/2-wire HART® Isolators

HIT/HIX

Installation

The HIX and HIT housings accommodate both 32mm,
DIN‑style G‑rail (EN50035) and 35mm Top Hat rail
(EN50022). Figure 1 and Figure 2 on Page 3 show
the dimensions of the housing for each type of isolator.

Electrical Connections

Caution:

Always remove power from the loop

before making any electrical connections.

Note:

Make sure to calibrate the instruments

prior to installation. Also, install all instruments in

their intended application and on their rail before

making any electrical connections. Allow enough

room for pivoting instruments vertically on the rail for

removal in applications involving multiple banks of

HIXs and/or HITs.

Recommended Ground Wiring
Practices

Moore Industries recommends the following ground
wiring practices:

• AnyMooreIndustriesproductinametalcase

or housing should be grounded.

• Theprotectiveearthconductormustbe

connected to a system safety earth ground
before making other connections.

• Allinputsignalsto,andoutputsignals

from, Moore Industries’ products should be
wired using a shielded, twisted pair wiring
technique. Shields should be connected to an
earth or safety ground.

Area Isolation

Figure 5 shows the connections for using an HIX
Isolator to provide area isolation for a secondary
HART master or receiver.

• Forthebestshielding,theshieldshouldbe

run all the way from the signal source to the
receiving device. (see Note below)

• Themaximumlengthofunshieldedinputand

output signal wiring should be 2 inches.

Note:

Some of Moore Industries’ instruments can be

classified as receivers (IPT2, IPX2, etc.) and some

can be classified as transmitters (TRX, TRY, etc.)

while some are both a receiver and a transmitter

(SPA2, HIM, etc). Hence, your shield ground

connections should be appropriate for the type

of signal line being shielded. The shield should

be grounded at the receiver and not at the signal

source.

The Interface Solution Experts 7

4-wire/2-wire HART® Isolators

HIT/HIX

CE Conformity

Installation of any Moore Industries’ products that
carry the CE marking must adhere to the guidelines in
the Recommended Ground Wiring Practices section in
order to meet the EN 61326 requirements set forth in
the applicable EMC directive.

WARNING:

If this unit is used in a manner not specied by

Moore Industries, the protection provided by the

equipment may be impaired.

Installation Category

All terminals are rated CAT II, except for terminals with
the ‑RF option. These terminals are rated CAT I.

Equipment Ratings

The HIT does not generate hazardous voltages,
rather, it provides a 4‑20mA current input a 4‑20mA
output. Products connected to the HIT should be
designed to receive these inputs.

Supply Wiring

All power connections should be made with 14 or 16
AWG (0.083mm or 0.064mm) wire.

Switches and Circuit Breakers

A switch or circuit breaker must be wired in series
with the AC power conductors. The switch or circuit
breaker used must be located within three meters of
the unit.

The circuit breaker or switch will only remove power to
the unit, hazardous voltages may still be connected to
other terminals on the unit.

WARNING:

Terminals on this unit may be connected to

hazardous voltages. Before making ANY

connections to this unit, ALL hazardous voltages

must be de-energized.

The end of each conductor should be stripped no
more than 8mm. The end of the stripped wire should
be tinned with solder, or inserted into a ferrule and
crimped before being placed into a terminal block.

Conductors connected to screw‑type connections
should have a ring‑ or spade‑lug crimped onto the
wire end.

8 The Interface Solution Experts

4-wire/2-wire HART® Isolators

HIT/HIX

Smart
HART

Transmitter

(Loop-powered)

Primary

HART

Master

(e.g., DCS,

PLC, etc.)

–

+

+

–

Secondary

HART

Master

(e.g., Recorder,

Emergency Shutdown

System, etc.)

4-20mA + HART

12 to 24Vdc
Power

OPTIONAL

HART
COMMUNICATOR

OPTIONAL

HART
COMMUNICATOR

4-20mA + HART

+– –

+

HIX

HART
ISOLATOR

+IN -IN

SPAN

ZERO

+PS –PS

Preventing Power Supply “Bucking”

Figure 5 shows how the HIX can be used to
overcome trouble with power supplies competing
to provide voltage to the HART transmitter. Often,
when a loop consists of several devices drawing
power from separate sources, disparate ground
potentials between these sources cause a “bucking”
phenomenon that can cause current skewing. By
adding a HIX (or HIT) to such loops, this problem is
eliminated.

Figure 5. Using the HIX to “Isolate” a Secondary HART Master.

Solving 4-Wire Transmitter Problems

Figure 6 shows how to use the 4‑Wire HIT to
provide the same kind of power supply isolation in
applications that call for the use of 4‑wire transmitters

The Interface Solution Experts 9

4-wire/2-wire HART® Isolators

HIT/HIX

Figure 6. Connecting the HIT in an Application

117
or
230Vac

HIT

HART
SIGNAL
ISOLATOR

+IN

SPAN

ZERO

+OUT –OUT

DC DCC GND

–

IN

+TX

Primary

HART

Master

(e.g., DCS,

PLC, etc.)

+ –

OPTIONAL

HART
COMMUNICATOR

4-20mA + HART

HIT

HART
SIGNAL
ISOLATOR

+IN

SPAN

ZERO

+OUT –OUT

DC DCC GND

–

IN

+TX

Smart
HART

Transmitter

(Externally-powered)

+

–

4-20mA + HART

OPTIONAL

HART
COMMUNICATOR

+

–

24Vdc
Power

10 The Interface Solution Experts

4-wire/2-wire HART® Isolators

HIT/HIX

Using -TX to Stop “Bucking”

117
or
230Vac

HIT

HART
SIGNAL
ISOLATOR

+IN

SPAN

ZERO

+OUT –OUT

DC DCC GND

–

IN

+TX

Smart
HART

Transmitter

(Loop-powered)

+

–

4-20mA + HART

OPTIONAL

HART
COMMUNICATOR

HIT

HART
SIGNAL
ISOLATOR

+IN

SPAN

ZERO

+OUT –OUT

DC DCC GND

–

IN

+TX

Primary

HART

Master

(e.g., DCS,

PLC, etc.)

+ –

OPTIONAL

HART
COMMUNICATOR

4-20mA + HART

+

–

24Vdc
Power

Another method of preventing competing power
supplies from causing loop problems incorporates
the HIT’s ‑TX option. Figure 7 shows how to hookup
up the 4‑wire HIT to power the HART transmitter.

This conguration not only solves the bucking power

supply problem. It also saves the cost of an additional
supply.

Figure 7. Using the HIT with TX to combat Power Supply Bucking.

When installing any Moore Industries product,
always follow all local regulations and standards
for grounding, shielding, and safety. The following
grounding and wiring practices must be followed for
HIX in order for the unit(s) to meet the requirements
set forth in EMC standard EN61326.

The Interface Solution Experts 11

RETURN PROCEDURES

United States • [e-mail]

Tel: [phone] • FAX: [phone]

Australia • [e-mail]

Tel: [phone] • FAX: [phone]

Belgium • [e-mail]

Tel: [phone] • FAX: [phone]

The Netherlands • [e-mail]

Tel: [phone] • FAX: [phone]

China • [e-mail]

Tel: [phone] • FAX: [phone]

United Kingdom • [e-mail]

Tel: [phone] • FAX: [phone]

To return equipment to Moore Industries for repair, follow these four steps:

1. Call Moore Industries and request a Returned Material Authorization (RMA) number.

Warranty Repair –
If you are unsure if your unit is still under warranty, we can use the unit’s serial number
to verify the warranty status for you over the phone. Be sure to include the RMA
number on all documentation.

Non‑Warranty Repair –
If your unit is out of warranty, be prepared to give us a Purchase Order number when
you call. In most cases, we will be able to quote you the repair costs at that time.
The repair price you are quoted will be a “Not To Exceed” price, which means that the
actual repair costs may be less than the quote. Be sure to include the RMA number on
all documentation.

2. Provide us with the following documentation:
a) A note listing the symptoms that indicate the unit needs repair
b) Complete shipping information for return of the equipment after repair
c) The name and phone number of the person to contact if questions arise at the factory

3. Use sufcient packing material and carefully pack the equipment in a sturdy shipping con‑
tainer.

4. Ship the equipment to the Moore Industries location nearest you.

The returned equipment will be inspected and tested at the factory. A Moore Industries rep‑
resentative will contact the person designated on your documentation if more information is
needed. The repaired equipment, or its replacement, will be returned to you in accordance
with the shipping instructions furnished in your documentation.

WARRANTY DISCLAIMER

THE COMPANY MAKES NO EXPRESS, IMPLIED OR STATUTORY WAR­RANTIES (INCLUDING ANY WARRANTY OF MERCHANTABILITY OR
OF FITNESS FOR A PARTICULAR PURPOSE) WITH RESPECT TO ANY
GOODS OR SERVICES SOLD BY THE COMPANY. THE COMPANY DIS­CLAIMS ALL WARRANTIES ARISING FROM ANY COURSE OF DEALING
OR TRADE USAGE, AND ANY BUYER OF GOODS OR SERVICES FROM
THE COMPANY ACKNOWLEDGES THAT THERE ARE NO WARRANTIES
IMPLIED BY CUSTOM OR USAGE IN THE TRADE OF THE BUYER AND
OF THE COMPANY, AND THAT ANY PRIOR DEALINGS OF THE BUYER
WITH THE COMPANY DO NOT IMPLY THAT THE COMPANY WARRANTS
THE GOODS OR SERVICES IN ANY WAY.
ANY BUYER OF GOODS OR SERVICES FROM THE COMPANY
AGREES WITH THE COMPANY THAT THE SOLE AND EXCLUSIVE REM­EDIES FOR BREACH OF ANY WARRANTY CONCERNING THE GOODS OR
SERVICES SHALL BE FOR THE COMPANY, AT ITS OPTION, TO REPAIR
OR REPLACE THE GOODS OR SERVICES OR REFUND THE PURCHASE
PRICE. THE COMPANY SHALL IN NO EVENT BE LIABLE FOR ANY CON­SEQUENTIAL OR INCIDENTAL DAMAGES EVEN IF THE COMPANY FAILS
IN ANY ATTEMPT TO REMEDY DEFECTS IN THE GOODS OR SERVICES
, BUT IN SUCH CASE THE BUYER SHALL BE ENTITLED TO NO MORE
THAN A REFUND OF ALL MONIES PAID TO THE COMPANY BY THE BUYER
FOR PURCHASE OF THE GOODS OR SERVICES.

ANY CAUSE OF ACTION FOR BREACH OF ANY WARRANTY BY
THE COMPANY SHALL BE BARRED UNLESS THE COMPANY RE­CEIVES FROM THE BUYER A WRITTEN NOTICE OF THE ALLEGED
DEFECT OR BREACH WITHIN TEN DAYS FROM THE EARLIEST DATE
ON WHICH THE BUYER COULD REASONABLY HAVE DISCOVERED
THE ALLEGED DEFECT OR BREACH, AND NO ACTION FOR THE
BREACH OF ANY WARRANTY SHALL BE COMMENCED BY THE
BUYER ANY LATER THAN TWELVE MONTHS FROM THE EARLIEST
DATE ON WHICH THE BUYER COULD REASONABLY HAVE DISCOV­ERED THE ALLEGED DEFECT OR BREACH.

RETURN POLICY

For a period of thirty-six (36) months from the date of shipment, and under
normal conditions of use and service, Moore Industries (“The Company”)
will at its option replace, repair or refund the purchase price for any of its
manufactured products found, upon return to the Company (transportation
charges prepaid and otherwise in accordance with the return procedures
established by The Company), to be defective in material or workmanship.
This policy extends to the original Buyer only and not to Buyer’s customers
or the users of Buyer’s products, unless Buyer is an engineering contractor
in which case the policy shall extend to Buyer’s immediate customer only.
This policy shall not apply if the product has been subject to alteration,
misuse, accident, neglect or improper application, installation, or operation.
THE COMPANY SHALL IN NO EVENT BE LIABLE FOR ANY INCIDENTAL
OR CONSEQUENTIAL DAMAGES.

© 2014 Moore Industries‑International, Inc.

Specications and Information subject to change without notice.