technical NOTES

Technical Comparision of Process Parameter Measurement Devices

S.N. Description Mechanical Switches TransmitterAnalog TransmitterSmart TransmitterProfibus

6 Calibration Drift

over a period of

time

More and

hence requires

frequent

calibration

check

More and

hence requires

frequent

calibration

check

Very Less drift

& high stability

Very Less

drift & high

stability

7 DCS interface

Engineering

Aspect

Very easy and

involves no

high skill ness

Very easy and

involves no

high skill ness

Easy Slightly

complicated

and requires

high skill ness

& Time

8 Erection &

Commissioning

Aspect Time

Requires more

time

Requires more

time

Requires more

time

Requires less

time

9 Market

Availability

Many Vendors

in market

Many Vendors

in market

Less number of

vendors

Only selected

vendors in

market

10 Delivery 4 to 6 weeks 6 to 8 weeks 6 to 8 weeks 8 to 10 weeks

7.3 Executive Summary:
The cost benefit analysis is of analogue transmitters, smart transmitters, profibus
transmitter and pressure switches is given here under for ready reference:

Typical Cost Benefit Analysis

Application

of Transmitter

Qty

Analog

Transmitter

(Fixed range)

Smart Transmitter

(4-20mA, HART)

Smart Profibus

Transmitter

Pressure/DP

Switches (@

Unit rate of Rs.

5000/-)

Nos. U/R Total U/R Total U/R Total Qty. Total

DP transmitters

for Bag Filters

26 10000 260000 28000 728000 35000 910000 26 130000

Pressure

Transmitters for

Bag Filters

26 8000 208000 23000 598000 30000 780000 26 130000

RABH DP

Transmitters-

DP type

17 10000 170000 28000 476000 35000 595000 17 85000

RABH Pressure

Transmitters

1 8000 8000 23000 23000 30000 30000 0 0

Coal Mill

Bag Filter

Transmitter-DP

Type

5 10000 50000 28000 140000 35000 175000 5 25000