Hoffer Flow Controls HIT-4G User manual

Model: HIT-4G
Gas Flow Rate Indicator & Dual Totalizer
With Modbus & Data Logging
USER’S MANUAL
107 Kitty Hawk Lane
●
P.O. Box 2145
●
Elizabeth City, NC 27909
1-800-628-4584 ●[phone] ●Fax [phone]
www.hofferflow.com email: [e-mail]
HP- 328
April 2021

HFC 9907-B
NOTICE
Hoffer Flow Controls, Inc. makes no warranty of any kind with regard to this
material, including, but not limited to, the implied warranties of merchantability and
fitness for a particular purpose.
This manual has been provided as an aid in installing, connecting, calibrating, operating,
and servicing this unit. Every precaution for accuracy has been taken in the
preparation of this manual; however, Hoffer Flow Controls, Inc. neither assumes
responsibility for any omissions or errors that may appear nor assumes liability for
any damages that result from the use of the products in accordance with information
contained in the manual.
HOFFER FLOW CONTROLS' policy is to provide a user manual for each item
supplied. Therefore, all applicable user manuals should be examined before
attempting to install or otherwise connect a number of related subsystems.
During installation, care must be taken to select the correct interconnecting wiring
drawing. The choice of an incorrect connection drawing may result in damage to the
system and/or one of the components.
Please review the complete model number of each item to be connected and locate the
appropriate manual(s) and/or drawing(s). Identify all model numbers exactly before
making any connections. A number of options and accessories may be added to the main
instrument, which is not shown on the basic user wiring. Consult the appropriate option
or accessory user manual before connecting it to the system. In many cases, a system
wiring drawing is available and may be requested from Hoffer Flow Controls.
This document contains proprietary information, which is protected by copyright. All
rights are reserved. No part of this document may be photocopied, reproduced, or
translated to another language without the prior written consent of Hoffer Flow
Controls, Inc.
HOFFER FLOW CONTROLS’ policy is to make running changes, not model
changes, whenever an improvement is possible. This affords our customers the latest
in technology and engineering. The information contained in this document is subject
to change without notice.
THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES,
EXPRESSED OR IMPLIED, INCLUDING ANY IMPLIED WARRANTY OF
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. HFC
SHALL NOT BE LIABLE FOR ANY LOSS OR DAMAGE RESULTING,DIRECTLY OR INDIRECTLY,
FROM THE USE OR LOSS OF USE OF THE GOODS.WITHOUT LIMITING THE GENERALITY OF
THE FOREGOING,THIS EXCLUSION FROM LIABILITY EMBRACES THE PURCHASER'S
EXPENSES FOR DOWNTIME OR FOR MAKING UP DOWNTIME,DAMAGES FOR WHICH THE
PURCHASER MAY BE LIABLE TO OTHER PERSONS,DAMAGES TO PROPERTY,AND INJURY
TO OR DEATH OF ANY PERSONS.HFC NEITHER ASSUMES NOR AUTHORIZES ANY PERSON
TO ASSUME FOR IT ANY OTHER LIABILITY IN CONNECTION WITH THE SALE OR USE OF
HFC'S GOODS,AND THERE ARE NO ORAL AGREEMENTS OR WARRANTIES COLLATERAL TO
OR AFFECTING THE AGREEMENT.PURCHASER'S SOLE AND EXCLUSIVE REMEDY IS THE
REPAIR AND/OR REPLACEMENT OF NONCONFORMING GOODS AS PROVIDED IN THE
PRECEDING PARAGRAPHS.HFC SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES
WHATSOEVER INCLUDING INDIRECT,INCIDENTAL,OR CONSEQUENTIAL DAMAGES.

HFC 9907-B
LIMITED WARRANTY POLICY FOR HOFFER FLOW CONTROLS
HOFFER FLOW CONTROLS, INC. ("HFC") warrants HFC's Precision Series, API Series and
CT Series of turbine flowmeters to be free from defects in material and workmanship under
normal use and service, only if such goods have been properly selected for the service intended,
properly installed and properly operated and maintained as described in the turbine flowmeter
manual. Reference "turbine flowmeter manual" for specific details. This warranty shall extend
for a period of five (5) years from the date of shipment to the original purchaser and covers the
Precision Series, API Series, and CT Series of flowmeters supplied with their standard hybrid
ceramic ball bearings only. All other HFC products carry a one (1) year warranty. This warranty
is extended only to the original purchaser ("Purchaser"). Purchaser's sole and exclusive remedy
is the repair and/or replacement of nonconforming goods as provided in the following
paragraphs.
In the event Purchaser believes the Hoffer product is defective, the product must be returned to
HFC, transportation prepaid by Purchaser, within the appropriate warranty period relative to the
product. If HFC's inspection determines that the workmanship or materials are defective and the
required maintenance has been performed and, has been properly installed and operated, the
product will be either repaired or replaced, at HFC's sole determination, free of additional
charge, and the goods will be returned, transportation paid by HFC, using a transportation
method selected by HFC.
Prior to returning the product to HFC, Purchaser must obtain a Returned Material Authorization
(RMA) Number from HFC's Customer Service Department within 30 days after discovery of a
purported breach of warranty, but not later than the warranty period; otherwise, such claims
shall be deemed waived. See the Return Requests/inquiries Section of this manual.
If HFC's inspection reveals the Hoffer product to be free of defects in material and workmanship
or such inspection reveals the goods were improperly used, improperly installed, and/or
improperly selected for service intended, HFC will notify the purchaser in writing and will
deliver the goods back to Purchaser upon receipt of Purchaser's written instructions and
agreement to pay the cost of transportation. If Purchaser does not respond within thirty (30)
days after notice from HFC, the goods will be disposed of in HFC's discretion.
HFC does not warrant the product to meet the requirements of any safety code of any state,
municipality, or other jurisdiction, and Purchaser assumes all risk and liability whatsoever
resulting from the use thereof, whether used singlely or in combination with other machines or
apparatus.
This warranty shall not apply to any HFC product or parts thereof, which have been repaired
outside HFC's factory or altered in any way, or have been subject to misuse, negligence, or
accident, or have not been operated in accordance with HFC's printed instructions or have been
operated under conditions more severe than, or otherwise exceeding, those set forth in the
specifications.
FOR NON-WARRANTY REPAIRS OR CALIBRATIONS, consult
HOFFER FLOW CONTROLS for current repair/calibration charges. Have
the following information available BEFORE contacting HOFFER FLOW
CONTROLS:
1. P.O. number to cover the COST of the repair/calibration,
2. Model and serial number of the product, and
3. Repair instructions and/or specific problems relative to the product.

HIT-4G HP-328
CONTENTS
1. INTRODUCTION -------------------------------------------1
Model Number Designation--------------------------------3
2. FEATURES AND SPECIFICATIONS -----------------7
2.1 General--------------------------------------------------8
2.2 Flowmeter Inputs -------------------------------------9
2.3 Temperature and Pressure Inputs ----------------9
2.4 DC Power/Loop Powered ---------------------------9
2.5 Battery Powered Version ------------------------- 10
2.6 Analog Output--------------------------------------- 10
2.7 Pulse Output ----------------------------------------- 10
2.8 Alarm Output with Dual Set Point-------------- 10
2.9 Serial Port RS485 ----------------------------------- 10
2.10 Data Logging----------------------------------------- 10
2.11 Physical ----------------------------------------------- 10
3. INSTALLATION ------------------------------------------ 11
3.1 4-20 mA Current Loop ---------------------------- 19
3.2 Analog Output Update Time --------------------- 20
3.3 Pulse Output ----------------------------------------- 21
3.4 Alarm Output---------------------------------------- 22
3.5 Temperature and Pressure Inputs -------------- 23
4. CONFIGURATION --------------------------------------- 25
4.1 Local Configuration-------------------------------- 25
4.2 Default Configuration ----------------------------- 32
5. OPERATION ----------------------------------------------- 33
5.1 Front Panel------------------------------------------- 33
5.2 Saving Total------------------------------------------ 33
5.3 Clearing the Total ---------------------------------- 34
5.4 Displaying Logs ------------------------------------- 34
5.5 Fault Conditions ------------------------------------ 35
5.6 Battery Replacement ------------------------------- 35
6. MODBUS COMMUNICATIONS---------------------- 37
7. HIT-4 COMMUNICATION PROGRAM ------------ 47
8. MAINTENANCE ------------------------------------------ 63

HP-328 HIT-4G
APPENDIX A - Declaration of Conformity ...................... 65
APPENDIX B - Installation Drawings and Conditions
for Safe Use for Certified System ........... 67

Introduction 1
HIT-4G HP-328
1. INTRODUCTION
The HIT-4G is a microprocessor-based gas flow rate indicator and
totalizer with data logger and Modbus Communications Protocol. The
instrument can accept a low-level signal from a magnetic type pickup
coil, a DC pulse signal, contact closure or modulated carrier pickup
(MCP/RF). Pulses from the signal input are converted into volume and
rate values based on flowmeter calibration settings stored in the
instrument. Temperature, pressure and compressibility compensation
may be used to calculate corrected volume and mass flow. The total
and flow rate are displayed on a two-line liquid crystal display (LCD).
A 4-20 mA analog signal proportional to the flowrate is output on the
current loop. The HIT-4G is configurable from the instrument front
panel keypad or via Modbus communications.
Figure 1 – HIT-4 Front Panel
Optional features include 20-point linearization to correct flow meter
non-linearity, a Scaled Pulse Output and Alarm Output configurable for
Rate or Total. An add-on printed circuit board provides additional
inputs for temperature and pressure transmitters as well as 100 Ohm
RTD.
HIT
-
4
HOFFER FLOW CONTROLS
,
INC
ELIZABETH CITY
,
NC
M
WWW
.
HOFFERFLOW
.
COM
00000000
LOW BAT x
1000
00000
UNCOMPENSATED
GAL L
LB KG
ACF M
3
SCF NM
3
BBL
/
MIN
/
HR
/
DAY

2 Introduction
HP-328 HIT-4G
Enclosure options include NEMA 4X, panel mount, IP66 rated
aluminum and Ex d certified for hazardous areas. Most enclosure
options may be wall mounted or directly mounted on a flowmeter using
an optional riser.
This instrument is designed to conform to the EMC-Directive of the
Council of European Communities 89/336/EEC and the following
standards:
Generic Emission Standard EN 61000-6-3
Residential, Commercial & Light Industry Environment.
Generic Immunity Standard EN 61000-6-1
Residential, Commercial & Light Industry Environment.
Electrostatic discharge requirements EN 61000-4-2
Radiated, radio-frequency, electromagnetic immunity EN 61000-4-3
Electrical fast transient/burst requirements EN 61000-4-4
Immunity to conducted disturbances EN 61000-4-6

Introduction 3
HIT-4G HP-328
MODEL NUMBER DESIGNATION
MODEL HIT-4( )
TEMPERATURE AND PRESSURE COMPENSATED GAS FLOW
RATE INDICATOR & DUAL TOTALIZER
WITH MODBUS® & DATA LOGGING
MODEL HIT-4( A )-( B )-( C )-( D )-( E )-( F )-( G )-( H )-( I )-( J )
TYPE
MODEL HIT-4( A )-( )-( )-( )-( )-( )-( )-( )-( )-( )
OPTION ( A )
(G) GAS
(L) LIQUID
(U) UNCOMPENSATED
ENCLOSURE STYLE
MODEL HIT-4( )-( B )-( )-( )-( )-( )-( )-( )-( )-( )
OPTION ( B )
(2)* NEMA 4X ENCLOSURE (HIT-4U MOUNTED BEHIND ENCLOSURE)
(3)* ALUMINUM CASTING POWDER COATED ENCLOSURE (IP66)
(7)* STAINLESS STEEL ENCLOSURE (IP66)
(P) PANEL MOUNT ENCLOSURE (IP40)
Note: Panel option not available for AC powered HIT-4G or HIT -4L
(PD) PANEL MOUNT ENCLOSURE WITH CLEAR DOOR AND LOCK (IP40)
Note: Panel option not available for AC powered HIT-4G or HIT-4L
(PF) PANEL MOUNT ENCLOSURE WITH CLEAR FLEXIBLE PVC COVER
(IP65 FRONT ONLY)
Note: Panel option not available for AC powered HIT-4G or HIT-4L
* OPTIONS FOR ENCLOSURE STYLE 3 AND 7
(_M) M20 CONDUIT THREAD. (NOT ALLOWED FOR USE IN CANADA)
(_S) SUNSHADE
TYPE
ENCLOSURE STYLE
INPUT POWER
PULSE INPUT
PULSE OUTPUT
ALARM
COMPENSATION METHOD
MOUNTING
COMMUNICATION PORT
SPECIAL FEATURES

4 Introduction
HP-328 HIT-4G
INPUT POWER
MODEL HIT-4( )-( )-( C )-( )-( )-( )-( )-( )-( )-( )
OPTION ( C )
(B) BATTERY POWERED
NOTE: MAG ONLY, NO ANALOG, PULSE, OR ALARM
(L) 2-WIRE, 4-20MA LOOP POWERED 8-30VDC
NOTE: MAG ONLY, NO PULSE OR ALARM
(D) 12 TO 30 VDC POWERED
NOTE: 4-20MA ANALOG OUT INCLUDED
(AC) AC POWERED UNIVERSAL 100-240VAC @ 0.15A 50/60 HZ
NOTE: NOT AVAILABLE FOR Ex d CERTIFIED SYSTEMS 4-20MA
ANALOG OUT INCLUDED
PULSE INPUT
MODEL HIT-4( )-( )-( )-( D )-( )-( )-( )-( )-( )-( )
OPTION ( D )
(M) MAGNETIC COIL, DRY CONTACT
(R) ISOLATED PULSE, RPM, RPR, HALL EFFECT COILS
(RF) MODULATED CARRIER COIL
PULSE OUTPUT
MODEL HIT-4( )-( )-( )-( )-( E )-( )-( )-( )-( )-( )
OPTION ( E )
(5*) 0-5V TTL/CMOS
(OC*) OPEN COLLECTOR
* INSERT (R) FOR RAW FREQUENCY PULSE OUTPUT
NOTE: NOT AVAILABLE WITH (B) OR (L) POWER INPUTS
ALARM - WITH USER-DEFINED LEVELS FOR RATE AND/OR TOTAL
MODEL HIT-4( )-( )-( )-( )-( )-( F )-( )-( )-( )-( )
OPTION ( F )
(5) 0-5V TTL/CMOS
(OC) OPEN COLLECTOR
NOTE: NOT AVAILABLE WITH (B) OR (L) POWER INPUTS
COMPENSATION METHOD-TEMP/PRESSURE LIQ/GAS
MODEL HIT-4( )-( )-( )-( )-( )-( )-( G )-( )-( )-( )
OPTION ( G )
(X) NO COMPENSATION, ALWAYS USE X ON HIT-4U
DEFAULT TEMPERATURE / PRESSURE COMPENSATION ON HIT-4G
(TP1_) TEMPERATURE AND PRESSURE TRANSMITTER INPUTS (4-20MA)
(TP2_) 100 OHM RTD (DIN385) / PRESSURE TRANSMITTER INPUTS
(4-20MA)

Introduction 5
HIT-4G HP-328
COMPRESSIBILITY OPTION
(_Z) ADD (Z) COMPRESSIBILITY SOFTWARE FOR GAS APPLICATIONS
EXCEEDING 50 PSIG. AT PRESSURES ABOVE 50 PSIG THE ERROR
DUE TO COMPRESSIBILITY WOULD BE GREATER THAN ± 1.0%
NOTE: COMPENSATION (TP, TPZ) NOT AVAILABLE WITH (B) OR
(L) POWER INPUTS
MOUNTING
MODEL HIT-4( )-( )-( )-( )-( )-( )-( )-( H )-( )-( )
OPTION ( H )
(X) REMOTE MOUNTING
(FX) STYLE 3 OR 7 ENCLOSURES MOUNTED ON TURBINE. MUST BE USED
WITH “X” RISER TURBINE OPTION.
(FXHT) 8" LONG TEMPERATURE RISER FOR STYLE 3 OR 7 ENCLOSURE
MOUNTED ON TURBINE. REQUIRED WHEN TEMPERATURES EXCEEDS
140 DEG. F. MUST BE USED WITH “X” RISER TURBINE OPTION.
(F) NEMA 4X STYLE 2 ENCLOSURE MOUNTED ON TURBINE.
MUST BE USED WITH “X” RISER TURBINE OPTION.
(FHT) 8" LONG TEMPERATURE RISER FOR NEMA 4X STYLE 2 ENCLOSURES
MOUNTED ON TURBINE. REQUIRED WHEN FLUID TEMPERATURES
EXCEED 140 DEG. F. USED WITH “X” RISER TURBINE OPTION.
(NP) NEMA 4X ENCLOSURE PIPE MOUNTING KIT
2" PIPE OR SMALLER. SPECIFY IF PIPE IS VERTICAL OR HORIZONTAL.
SYSTEM CERTIFIED MOUNTING OPTIONS FOR ENCLOSURE STYLE 3 AND 7:
(MX_) METER MOUNTED
NOTE: USED WITH “X” RISER, AND 1" X ¾" SS ADAPTER.
PROCESS TEMP -40°C TO +78°C.
(MA_) METER MOUNTED
NOTE: USE WITH A (X-ATEX) RISER.
PROCESS TEMP -40°C TO +78°C.
(RX_) REMOTE MOUNTED
NOTE: USE WITH “X” RISER. INCLUDES “E2” JUNCTION BOX
AND 1" X 3/4" SS ADAPTER.
(RA_) REMOTE MOUNTED
NOTE: USE WITH A (X-ATEX) RISER. INCLUDES “E2” JUNCTION
BOX.
UNION OPTIONS:
(___U1) OPTIONAL 1" MALE X 1" FEMALE EX-PROOF UNION
NOTE: USE WITH MX AND RX OPTIONS
(___U2) OPTIONAL 3/4" MALE X 3/4" FEMALE EX-PROOF UNION
NOTE: USE WITH MA AND RA OPTIONS

6 Introduction
HP-328 HIT-4G
SYSTEM CERTIFIED EXPLOSION-PROOF RATINGS:
STYLE 3 & 7: CSA/FM: CLASS I DIV. 1, GR. C,D; CLASS II, DIV. 1, GR. E,F,G;
CLASS III, T6; TYPE 4X;
CLASS I ZONE 1 AEx db IIB, T6 Gb IP66
ZONE 21 AEx tb IIIC T80°C Db IP66
Ex db IIB T6 Gb; Ex tb IIIC T80°C Db; IP66
- ATEX/IECEx: II 2 G Ex db IIB T6 Gb; IP66
II 2 D Ex tb IIIC T80°C Db; IP66
COMMUNICATION PORT
MODEL HIT-4-( )-( )-( )-( )-( )-( )-( )-( I )-( )
OPTION ( I )
(T)* INTERNAL TERMINAL BLOCK
RS485/MODBUS, DATA LOGGING, CONFIGURATION AND MONITORING
RECOMMENDED FOR PERMANENT FIELD CONNECTION TO HIT-4X
ALL ENCLOSURES
(U)* EXTERNAL USB STYLE CONNECTOR
RS485/MODBUS FOR DATA LOGGING/CONFIGURATION
NEMA 4X ENCLOSURE ONLY
(X) NONE
SPECIAL FEATURES
MODEL HIT-4( )-( )-( )-( )-( )-( )-( )-( )-( )-( J )
OPTION ( J )
CE) CE MARK REQUIRED FOR EUROPE
(SP) ANY SPECIAL FEATURES THAT ARE NOT COVERED IN THE
MODEL NUMBER USE A WRITTEN DESCRIPTION OF THE -SP.
(X) NO SPECIAL FEATURES

Features and Specifications 7
HIT-4G HP-328
2. FEATURES AND SPECIFICATIONS
•LCD display for Total, Rate, Temperature and Pressure
•Non-resettable Grand Total
•Full front panel operation with magnetic pointer via Ex
enclosure
•Up to 20-Point Linearization to correct for flowmeter
non-linearity
•4-20mA analog output proportional to flow rate
•Optional Scaled Pulse Output representing an incremental
total volume
•Alarm Output with dual set point configurable for Rate or
Total
•Magnetically operated switch for Total reset
•Internal battery pack backup
•Configuration and Grand Total stored in non-volatile
memory. Total and Grand Total saved when pressing
►button.
•Data Logging: Hourly Total, Daily Total, Event Logs
•Modbus Communications Protocol via RS485
•Real Time Clock
•AGA-8 Compliant

8Features and Specifications
HP-328 HIT-4G
2.1 General
Display:
LCD, updated every 1 seconds.
Total: 8 digits 3/8" high. Resettable using a magnet, a
dry contact, from front panel keypad or via
Modbus communications.
Value is stored in non-volatile memory when
pressing ►button.
Total Units:
GAL, LIT, FT3, ACF, ACFx1000, M3, BBL, KG,
LB, NM3, SCF, SCFx1000.
Grand Total:
8 digits 3/8" high, non-resettable. Value is stored
in non-volatile memory when pressing ►button.
Grand Total is displayed for 7 seconds after
pressing the ▲ button.
Rate:
6 digits 1/2" high.
Rate Units:
/SEC, /MIN, /HR, /DAY
K-factor:
The pulses per unit of Total (e.g. pulses/gallon)
are configurable in the range 0.001 to 9,999,999.
Linearization:
2-20 points.
Decimal Points:
Decimal Point positions are configurable for 0,
0.0, 0.00, or 0.000 for rate, total and K-factor.
Accuracy:
Total and Rate: ±0.01% of reading, ±1 Count

Features and Specifications 9
HIT-4G HP-328
2.2 Flowmeter Inputs
Magnetic Pickup:
Frequency Range:
0.2 Hz to 5000 Hz.
Signal Level:
30 mVP-P to 30 VP-P.
Opto-Isolated DC Pulse:
Frequency Range:
0 Hz to 3000 Hz.
Signal Level:
0 to +DC pulse.
Internal Pull-Up
10 kΩ to +DC
Low (Logic 0):
< 1 VDC
Min Pulse width:
0.1 msec
Contact Closure:
Frequency Range:
0 Hz to 5000 Hz
Internal Pull-up:
220 kΩ to +3.3 VDC
Reset:
Signal Type:
Contact closure
Min Time On:
25 msec
Internal Pull-up:
35 kΩ to +3.3 VDC
MCP/RF Input
2.3 Temperature and Pressure Inputs
Temperature Input:
Type:
*4-20 mA, 100ΩRTD (DIN385)
Resolution:
12 bit
Pressure Input:
Type:
*4-20 mA
Resolution:
12 bit
*4-20 mA input not available with battery power.
2.4 DC Power/Loop Powered
Voltage:
8 to 30 VDC
Current:
< 24 mA
Loop Burden:
8 VDC maximum
Supply Backup:
One C-size 3.6V Lithium battery pack for
Ex systems
Protection:
Reverse polarity protected

10 Features and Specifications
HP-328 HIT-4G
2.5 Battery Powered Version
Battery Type:
Two C-size 3.6 lithium battery or
battery pack (4xAA) for Ex systems
Battery Life:
2 years typical
1 year typical – Ex system battery pack
Protection:
Reverse polarity protected
2.6 Analog Output
Scale:
4 – 20 mA follows rate.
Accuracy:
0.02% of Full Scale @ 20ºC.
Temperature drift:
40 ppm/°C
Update Time:
0.125 seconds.
Protection:
Reverse polarity protected
2.7 Pulse Output
Type:
0-5V TTL, Open collector (30 VDC, 100 mA)
Divider:
0.01, 0.1, 1, 10, 100
Pulse Width:
Adjustable 4ms to 300ms
Max Frequency:
100Hz
2.8 Alarm Output with Dual Set Point
Type:
0-5V TTL, Open collector (30 VDC, 100 mA)
Function:
Rate or Total
2.9 Serial Port RS485
Protocol:
Modbus RTU
Function:
Data Logging, Configuration Process Monitor
2.10 Data Logging
Hourly Total Log:
768
Daily Total Log:
378
Event Log:
345
Accessing Logs:
Via Modbus communication
Up to 100 latest logs are viewable on the
front panel
2.11 Physical
Temperature:
Operating: -40°F (-40°C) to 158°F (70°C).
Humidity:
0 – 90% Non-condensing.
Packaging:
Explosion proof
(Approx. 5"x5"x5", 3 lbs.)

Installation 11
HIT-4G HP-328
3. INSTALLATION
Warning: Do not open explosion-proof enclosure while
circuits are powered in hazardous locations.
Field wiring connections
All field wiring connections should be made using shielded cables. The
shield should be connected to the chassis ground lug on the HIT-4G
enclosure. The shield on the opposite end of the cable should be left
open. Connections are made to the HIT-4G terminal blocks using wire
gauges 26-16 AWG, tightening Torque 0.22 to 0.25Nm.
Accessing terminal block connections
Ex Enclosure:
1. Loosen the locking set screw using a 1/16" hex key (Allen
wrench) and unscrew the cover of the enclosure counter-
clockwise until it separates from the body of the enclosure.
2. Remove two #4-40 x 3/8" pan head screws from the front panel
by turning counter-clockwise.
3. Lift the display assembly from the enclosure. Terminal blocks
are on the bottom.
NEMA Enclosure:
1. Loosen, by turning counter-clockwise, the screws in each
corner of the enclosure cover to remove.
2. Remove four #4-40 thumb screws from the front panel by
turning counter-clockwise.
3. Lift the display assembly from the enclosure. Terminal blocks
are on the bottom.
Making connections to terminal blocks
1. Use a small flat blade screwdriver and turn counter-clockwise
to loosen the proper terminal screw.
2. Insert wire (26-16 AWG) and turn terminal screw clockwise to
tighten.
3. Lightly pull on wire to ensure proper connection.

12 Installation
HP-328 HIT-4G
SW1PCA192
Hoffer Flow Controls
Tx A
Tx B
TB3
1 2 3 4 5 6
TB2
Flow+
Flow-
TB1
DC+
DC-
A na lo g
Magnetic
Pickup RS485
RS485
A
B
Battery Powered with Magnetic Pickup
SW1PCA192
Hoffer Flow Controls
Tx A
Tx B
TB3
1 2 3 4 5 6
TB2
Flow+
Flow-
TB1
DC+
DC-
A na log
Conta ct
Clo su re RS485
RS485
Battery Powered with Contact Closure

Installation 13
HIT-4G HP-328
SW1
PCA192
Hoffer Flow Controls
Tx A
Tx B
TB3
1 2 3 4 5 6
TB2
Flow+
Flow-
TB1
DC+
DC-
A na lo g
Load
+
-
Magnetic
Pickup RS485
RS485
A
B
Loop Powered with Magnetic Pickup
SW1
PCA192
Hoffer Flow Controls
Tx A
Tx B
TB3
1 2 3 4 5 6
TB2
Flow+
Flow-
TB1
DC+
DC-
A na lo g
Load
+
-
Conta ct
Clo sure RS485
RS485
Loop Powered with Contact Closure

14 Installation
HP-328 HIT-4G
SW1
PCA192
Hoffer Flow Controls
Puls e+
Puls e-
Alarm+
Alarm-
Tx A
Tx B
TB3
1 2 3 4 5 6
TB2
Flow+
Flow-
TB1
DC+
DC-
A na lo g
+
-
Red iP ul se
Pickup
TTL (0-5VDC)
Load
RS485
RS485
A
C
B
REG
DC Powered with Analog Output and
RediPulse Pickup (0-5V/TTL)
SW1
PCA192
Hoffer Flow Controls
Puls e+
Puls e-
Alarm+
Alarm-
Tx A
Tx B
TB3
1 2 3 4 5 6
TB2
Flow+
Flow-
TB1
DC+
DC-
A na lo g
+
-
Red iP ul se
Pickup
Open
C ol le ct or
Load
RS485
RS485
A
C
B
REG
DC Powered with Analog Output and
RediPulse Pickup (Open Collector)