Omega Products FLSC790-MA Installation Manual

User’s Guide

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FLSC790-MA

4-20 mA Module

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply. OMEGA
is constantly pursuing certification of its products to the European New Approach Directives. OMEGA will add
the CE mark to every appropriate device upon certification.

The information contained in this document is believed to be correct, but OMEGA Engineering, Inc. accepts no liability for any
errors it contains, and reserves the right to alter specifications without notice.

WARNING: These products are not designed for use in, and should not be used for, patient-connected applications.

TABLE OF CONTENTS

Introduction ................................................1

Installation.................................................. 1

Wiring......................................................... 2

Calibration.................................................. 4

Dimensions.................................................5

Specifications .............................................6

Parts List .................................................... 7

Troubleshooting .........................................7

Warranty/Disclaimer .................................. 9

Return Requests/Inquiries .......................... 9

INTRODUCTION

Caution: This 4-20 mA Module is not FM

Approved. Therefore , use of this mod­ule with an approved metering system,
voids FM Approval.

NOTE: This module requires an input power

supply of 7 to 30 volts DC. (24 VDC is
recommended) The DC signal will power
the meter electronics, leaving the batter­ies as backup for the meter electronics.

NOTE: Field Calibration is required.

This manual is designed to be used only with
FTB790 Series Turbine Meters. More spe­cifically, turbine housings with the follow­ing models: FTB791, FTB792, FTB793,
FTB794, and FTB795.

INSTALLATION

T o install this module, follow the instructions
given below.

1. Remove the back coverplate from the
turbine housing.

2. Remove the display electronics from the
front of the turbine.

NOTE: If you are installing more than one

module at a time, take care to keep the
proper electronics paired with the origi­nal turbine.

3. The 4-20 mA Module connects to a 10­pin connector located on the back side
of the computer electronics next to the
negative battery connectors. The 10-pin
connector is sealed with a clear plastic

+–

J2

J6

+–

sealant that must be carefully pried out
with a small sharp tool inserted gently
at the edges.

4. Remove the backing from the double-sided
tape on the module’s circuit assembly.

5. Carefully align the top pin on the circuit
assembly with the J2 position on the 10­pin connector and gently press the
module’s circuit assembly into position
between the batteries. The bottom pin
will align with the J6 position.

6. Guide the loose ends of the wires from the
circuit assembly through the housing’s ca v­ity to the back side of the turbine.

7. Install the display electronics to the front
side of the turbine and tighten the four
screws snugly.

8. Connect the loose ends of the wires from
the electronics circuit assembly to the
terminal block marked “From EDM.”
Connect wires per colors noted beside
connection pins.

NOTE: Ten feet of wire is provided with the

module. If trimming is necessary, do it no w.
If you provide your own wire, prepare it
for connection prior to the next step.

9. Connect the wires at the module’s ter­minal block marked “Cable from Cus­tomer” as illustrated in Wiring Section.

10. Complete connections to the interface
device according to the manufacturer’s
instructions.

11. Before installing the module onto the tur­bine housing, adjust the ZERO and SPAN
trimpots as noted in Calibration Section.
When adjustments are finished, make sure
the O-ring is fully seated and no wires are
pinched. Then, secure the module onto the
housing by snugly tightening the six screws
provided with the module.

1

WIRING

This is the wiring diagram for the 4-20 mA output.

7-30 VDC
Power Supply

Red

White

Black

I + I –
White Black

+–

4-20 mA

Meter

Output (4-20 mA)

4-20 mA Module Terminal Connections

Wires

from
EDM

Cable from

Customer

Equipment

Not Used (Red)

I (–) Loop (Black)

I (+) Loop (White)

Customer’s
Recording Device

++

––

Wires from EDM detail:

White wire from 10-pin connector J2.
Red wire from 10-pin connector J5.
Black wire from 10-pin connector J6.

2