Hoffer Flow Controls HIT-4U User Manual

HP- 327

September 2018

Model: HIT-4U

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]

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

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 are 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.

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

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.

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

HIT-4U HP-327

CONTENTS

1. INTRODUCTION ------------------------------------------1
Model Number Designation-------------------------------3

2. FEATURES AND SPECIFICATIONS-----------------7

2.1 General---------------------------------------------------8

2.2 Inputs-----------------------------------------------------9

2.3 DC Power/Loop Powered ----------------------------9

2.4 Analog Output------------------------------------------9

2.5 Pulse Output ------------------------------------------ 10

2.6 Alarm Output with Dual Set Point--------------- 10

2.7 Serial Port RS485------------------------------------ 10

2.8 Data Logging------------------------------------------ 10

2.9 Physical ------------------------------------------------ 10

3. INSTALLATION ----------------------------------------- 11

3.1 4-20 mA Current Loop ----------------------------- 18

3.2 Analog Output Update Time ---------------------- 19

3.3 Pulse Output ------------------------------------------ 20

3.4 Alarm Output----------------------------------------- 21

4. CONFIGURATION -------------------------------------- 23

4.1 Local Configuration--------------------------------- 23

4.2 Default Configuration------------------------------- 30

5. OPERATION ---------------------------------------------- 31

5.1 Front Panel-------------------------------------------- 31

5.2 Saving Total------------------------------------------- 31

5.3 Clearing the Total------------------------------------ 32

5.4 Displaying Logs--------------------------------------- 32

5.5 Fault Conditions ------------------------------------- 33

5.6 Battery Replacement-------------------------------- 33

6. MODBUS COMMUNICATIONS --------------------- 34

7. HIT-4 COMMUNICATION PROGRAM ----------- 43

8. MAINTENANCE ----------------------------------------- 55

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HP-327 HIT-4U

APPENDIX A – Declaration of Conformity ---------------- 57

APPENDIX B – Installation Drawings and Conditions
for Safe Use for Certified Systems------ 59

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Introduction 1

HIT-4U HP-327

1. INTRODUCTION

The HIT-4U is a battery, DC or loop-powered microprocessor-based
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. The total volume 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-4U is configurable from the instrument front panel
keypad or via Modbus communications.

Figure 1 – HIT-4U 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.

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.

HIT‐4

HOFFER FLOW CONTROLS , INC

ELIZABETH CITY , NC

M

WWW .HOFFERFLOW .COM

00000000

LOW BAT x 1000

00000

UNCOMPENSATED

GAL L
LB KG

A

CF M 3

SCF NM

3

BBL

/

MIN

/HR

/

DAY

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

2 Introduction

HP-327 HIT-4U

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

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Introduction 3

HIT-4U HP-327

MODEL NUMBER DESIGNATION

MODEL HIT-4( )

FLOW RATE INDICATOR/TOTALIZER

WITH MODBUS® COMMUNICATIONS PROTOCOL

MODEL HIT-4( A

)-( B )-( C )-( D )-( E )-( F )-( G )-( H )-( I )-( J )

TYPE

MODEL HIT-4( A

)-( )-( )-( )-( )-( )-( )-( )-( )-( )

OPTION

( A )

(U) UNCOMPENSATED

(G) GAS

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)

(PD) PANEL MOUNT ENCLOSURE WITH CLEAR DOOR AND LOCK (IP40)

(PF) PANEL MOUNT ENCLOSURE WITH CLEAR FLEXIBLE PVC COVER
(IP65 FRONT ONLY

)

* 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

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4 Introduction

HP-327 HIT-4U

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)

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Introduction 5

HIT-4U HP-327

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

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6 Introduction

HP-327 HIT-4U

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 (PENDING)

(SP) ANY SPECIAL FEATURES THAT ARE NOT COVERED IN THE
MODEL NUMBER USE A WRITTEN DESCRIPTION OF THE -SP.

(X) NO SPECIAL FEATURES

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Features and Specifications 7

HIT-4U HP-327

2. FEATURES AND SPECIFICATIONS

 LCD display for Total and Rate

 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

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8 Features and Specifications

HP-327 HIT-4U

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

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Features and Specifications 9

HIT-4U HP-327

2.2 Inputs

Magnetic Pickup:

Frequency Range: 0.2 Hz to 5000 Hz.
Signal Level: 30 mV

P-P

to 30 V

P-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
External Magnet

MCP/RF Pickup

2.3 DC Power/Loop Powered

Voltage: 8 to 30 VDC
Current: < 24 mA
Loop Burden: 8 VDC maximum
Supply Backup: Two (C) Size Lithium or battery pack for

Ex systems
Battery Life: 2 years typical-Two (C) size battery
1 year typical-Ex system battery pack
Protection: Reverse polarity protected

2.4 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

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10 Features and Specifications

HP-327 HIT-4U

2.5 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

2.6 Alarm Output with Dual Set Point

Type: 0-5V TTL, Open collector (30 VDC, 100 mA)
Function: Rate or Total

2.7 Serial Port RS485

Protocol: Modbus RTU
Function: Data Logging, Configuration Process

Monitor

2.8 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

2.9 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.)

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Installation 11

HIT-4U HP-327

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 HIT­4U enclosure. The shield on the opposite end of the cable should be left
open. Connections are made to the HIT-4U 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 counter­clockwise 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.

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12 Installation

HP-327 HIT-4U

SW1

PCA192

HofferFlowControls

Tx A
Tx B

TB3

123456

TB2

Flow+
Flow‐

TB1

DC+
DC‐
Analog

Magnetic

Pickup

RS485

RS485

A

B

Battery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‐
Analog

Contact
Closure

RS485

RS485

BatteryPoweredwithContactClosure

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Installation 13

HIT-4U HP-327

SW1

PCA192

HofferFlowControls

Tx A
Tx B

TB3

123456

TB2

Flow+
Flow‐

TB1

DC+
DC‐
Analog

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‐
Analog

Load

+

‐

Contact
Closure

RS485

RS485

Loop Powered with Contact Closure

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14 Installation

HP-327 HIT-4U

SW1

PCA192

HofferFlowControls

Pulse+
Pulse‐
Alarm+

Alarm‐

Tx A
Tx B

TB3

123456

TB2

Flow+
Flow‐

TB1

DC+
DC‐
Ana log

+

‐

RediPulse

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

Pulse+
Pulse‐
Alarm+

Alarm‐

Tx A
Tx B

TB3

123456

TB2

Flow+
Flow‐

TB1

DC+
DC‐
Ana log

+

‐

RediPulse

Pickup

Open

Collector

Load

RS485

RS485

A
C
B

REG

DC Powered with Analog Output and

RediPulse Pickup (Open Collector)

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

Installation 15

HIT-4U HP-327

SW1

PCA192

HofferFlowControls

Pulse+
Pulse‐
Alarm+

Alarm‐

Tx A
Tx B

TB3

123456

TB2

Flow+
Flow‐

TB1

DC+
DC‐
Ana log

+

‐

RediPulse

Pickup

Open

Collector

RS485

RS485

A
C
B

REG

*

*Jumperisrequiredif4‐20mAisnotconnected

DC Powered (no analog output) with

RediPulse Pickup (Open Collector)

SW1

PCA192

HofferFlowControls

Pulse+
Pulse‐

Alarm+
Alarm‐

Tx A
Tx B

TB3

123456

TB2

Flow+
Flow‐

TB1

DC+
DC‐
Ana log

4‐20mALoad

+

‐

Magnetic

Pickup

RS485

RS485

A

B

DC Powered with Analog Output

and Magnetic Pickup

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

16 Installation

HP-327 HIT-4U

PCA192

Pulse+
Pulse‐

Alarm+
Alarm‐

Tx A
Tx B

TB3

TB2

Flow+
Flow‐

TB1

DC+
DC‐

Analog

4‐20mALoad

+

‐

MCP

Pickup

RS485

RS485

123456

SW1

J2

PCA193

TB1

A

B

DC Powered with Analog Output

and MCP/RF Pickup



Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

Installation 17

HIT-4U HP-327

RS485 Communications Port Wiring

1234 5

Communication Kit P/N: 800-0483

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com

18 Installation

HP-327 HIT-4U

Flowmeter Input

The flowmeter input accepts a low-level sinusoidal signal from a
magnetic type pickup coil, contact closure or DC pulse signal. An
optional circuit board (PCA193) provides an input that will accept a
signal from MCP/RF type pickups. Switches 1,2,3,4,5,6 on SW-1 must
be set according to the type of pickup coil to be used.

SW-1 SWITCH SETTINGS FOR FLOWMETER INPUT OPTIONS

INPUT OPTION SW-1 SETTINGS

Magnetic pickup

Contact Closure

1,2,3 - ON

4,5,6 - OFF

1 2 3 4 5 6

RediPulse

TTL

1,2,3,5 - OFF

4,6 - ON

1 2 3 4 5 6

RediPulse

Open Collector

*MCP/RF

1,2,3,6 - OFF

4,5 - ON

1 2 3 4 5 6

* PCA193 is required and J2 must be equipped for MCP/RF

3.1 4-20 mA Current Loop

When powered from a two-wire 4-20 mA current loop, a minimum
supply voltage in the range of 8-30 Volts DC is required, depending on
the loop load resistance. At nominal 250 Ohms loop resistance the
minimum power supply is 13V.

Backup batteries are included to ensure that volume accumulation will
not be interrupted during a power failure.

Flow-Tech, Inc. | In MD 410-666-3200 - In VA 804-752-3450 | www.flowtechonline.com