FFI SYSTEM

FFM…3

OPTICAL DIFFERENTIAL PRESSURE TRANSMITTER

REMOTE SEAL TYPE

DATA SHEET

The Model FFM 3 Optical Differential Pressure Transmit-

ter Remote Seal Type measures pressures of various fluids

accurately, converts them into optical digital signals and

outputs them. This is an intelligent transmitter providing

excellent performance and functions due to incorporation

of electrostatic capacitance type silicon sensor and micro-

processor.

A fiber optic cable used for the signal transmission line

forms an optical field instrumentation system together with

an optical star coupler and a master station.

FEATURES

1. Resistive to noise and lightning

Optical signal ensures a reliable signal transmission, be-

cause it is not affected by external noise and inductive

lightning. Use of a nonmetallic optical (fiber) cable pre-

vents propagation of inductive lightning through the cable,

so a signal transmission immune to lightning can be real-

ized.

2. Reliability due to redundant configuration

Host system can be duplicated by using two optical cable

trunk lines (between an optical star coupler and host sys-

tem). This enhances reliability of users’ systems.

3. Intrinsic safety type explosion-proof

Each equipment with a built-in battery can be constructed

so as to be an intrinsic safety type individually (intrinsic

safety type barrier unnecessary).

SPECIFICATIONS

Functional specifications

Fluids measured: Liquid, gas or steam

Measuring range:

Operating pressure: Up to the maximum value of

operating pressure of flange.

FFM

□□3

FFM

□□5

FFM

□□6

32

130

500

32

130

500

0.8

3.25

12.5

Type

Span [kPa]

Range limit [kPa]

Minimum

value

Maximum

value

Lower

range limit

Upper

range limit

Process temperature, Allowable pressure limit:

Fill-fluid

Fluorolube oil

Silicon oil

13th

code

digit

W, A, D

K

Process

temperature

-20 to 120˚C

-15 to 200˚C

Allowable

pressure limit

Atmospheric pressure

or higher

Silicon oil

H

-15 to 250˚C

Silicon oil

J

 85 to 300˚C

Silicon oil

Y, G

-40 to 120˚C 2.7 kPa abs or higher

See Fig. 1.

Silicon oil

S

-15 to 250˚C

Silicon oil

T

 85 to 300˚C

0.13 kPa abs or higher

See Fig. 2.

For small bores 40A, 50A, 1-1/2B, 2B:

Self-diagnosis: Displayed on indication unit (option) and

transmitted to master station.

Remote control function:

See Table 1.

Output signal:

Optical digital signal

Power supply:

Built-in lithium battery

(expected life about 4 years)

Item

Host system Indication unit

Measuring range abnormal

○○

Detecting unit failure

○○

Amplifier abnormal

○○

Battery voltage

○−

Battery voltage low alarm

○○

Fill-fluid

13th

code

digit

W, A, D

Process

temperature

Allowable

pressure limit

H

Y, G

S

Atmospheric pressure

or higher

2.7 kPa abs or higher

See Fig. 1.

-20 to 120˚C

Fluorolube oil

Silicon oil

Silicon oil

Silicon oil

0 to 250˚C

0 to 250˚C

-40 to 120˚C

Date

EDS6-126

May 20, 2004