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