Hoffer Flow Controls HIT-4G, User Manual

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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