BULLETIN NO.

165
[~ Automat,)
Effective from 01-03-06

... the level & gas people SmartDisplacement

Typelevel Transmitter
180-9001 : 2000 CERTIFIED COMPANY

PRODUCT SPECIFICATION AND MODEL SELECTION GUIDE

DESCRIPTION:

Automat displacement type Level Transmitter( Fig. 1) is

designed to sense Liquid level, Interface and Specific
Gravity.The output of the Instrument is proportional and
is designed to measure and transmit electrical signal
proportional to changes in Liquid level or Specific
Gravity.

The V. Automat series 401ES measures changes in

Liquid Level, Specific Gravity or Interface Level and
transmits a current output signal proportional to the
change in the process parameter. The change in the
process parameter causes a change in the displacer
position, which is transferred to the Torque Tube (Fig. 2)
producing a rotary motion. This rotary motion is
transferred through bellow to lever assembly that is
supported by flexure strips. Magnets attached to the
lever assembly move past a Hall effect position sensor
that converts the magnetic field signal to an electrical 4-
20mAsignal.
Fig.1

The Transmitter has been provided with magnet setting knob which can be used to adjust setting of magnet in
relation to hall effect sensor. Magnet setting knob can also be used to check for fault finding between mechanical
system & electronic system. The magnet sensing knob allows to find out problem without removing the transmitter
orfield wiring cover orthe signal Conditioner Cover. The above adjustment does not require raising or lowering of
the level. This facility is only available in Automat displacement type level transmitter.

INTRODUCTION:

Series 401ES Automat Displacement level transmitter consist of certified electronic.This assembly along with hall
effect sensor makes complete level transmitter. 401ES series SMART displacement level transmitters are
microprocessor-based instruments that combine the analog signal advantages (4 - 20 mA) together with the
flexibility of digital communication using HART@protocol. Displacement level Transmitter can be configured by
using universal Hand Held HART communicator(HHT) or by Computer(PC) with dedicated software. The facility
of Automat design is easy calibration by any of the two different methods i.e. HHT as well as by PC with
dedicated software.

PRINCIPLE OF OPERATION:

A Level, density, or interface level change in the measured fluid causes a change in displacer position. This change
is transferred to the Torque Tube assembly. As the measured fluid changes, the Torque Tube assembly rotates upto
3.7 degrees varying the transmitter output between 4 and 20 mA.
The rotary motion is transferred to the transmitter lever assembly (via a bellow) supported by flexure strips.
The rotary motion moves a magnet attached to the lever assembly, changing the magnetic field that is sensed by
the Hall effect position sensor. The sensor then converts the magnetic field signal to an electronic signal.
The electronic signal is ambient, temperature compensated and amplified by the differential amplifier. The low pass
filter dampen the effects of process turbulence and prevents saturation ofthe dc amplifier and the current driver.
[". Automat,) ... the level & gas people

The current driver circuit devlops 4 to 20 mAcurrent output signal proportional to the dc amplifier voltage output.
The voltage regulator provides the regulated voltage needed by the transmitter. Circuits within the transmitter
provides Reverse polarity protection, transient power surge protection, and Electromagnetic interference
(EMI) protection.

SPECIFICATIONS:

Displacer length........... Refer VI on page 4

Input Signal................ Liquid level or liquid Interface Level: From 0 to 100% of Displacer length

Min. Differential........... 0.3 to 1.2 (with Standard Displacer) & 0.5 (with special displacer)
Specific Gravity

Output Signal.............. Two Wire 4 - 20mAdc.

OutputAction ......... Direct- increasing input increases output: or

Reverse increasing input decreases output

Display ... LCD Display Meter

Reference Accuracy. .... +/- 0.5% of full scale ( better on request)

(Specific gravity 1.0)

Linearity Adjustment..... 8 Points through software.

Damping .. 32 sec.

Calibration facility....... By Two methods Le Hand Held Communicator(HHT)& PC

PowerSupply ............. a) 35 V DC. For explosion proof

b) 30 V DC. For intrinsically safe

Power supply effect. ..... Negligible between 13 and 35 V de.

Load Resistance.......... 600 ohm at 24 Vdc.

Span Adjustability......... 30 to 100% of Displacer length for level application using a standard volume displacer.

Zero Adjustability......... 15% of sensing element range.

Diagnostic of Mechanical. Provided

& Electronic

Cages Sensor............ Cages can be furnished in a variety of end connection

Connection Styles styles to facilitate mounting on vessels.

Operative Amb. Temp. ... 65°C

Elect. Connection....... 1/2" NPT. (Single Cable Entry Standard, Dual Optional)

2
(~ Automat,) ... the level & gas people

Elect. Classification .......... 1. Weather proof IP 66

certified by CMRI Dhanbad (to be designated as W).
2. Explosion proof for group IIA&liB cum Weatherproof
Certified by CMRI Dhanbad Explosion proof
(to be designated as E).
3. Intrinsically safe for Group I, IIA,liB & IICand Ip66
certified by CMRI Dhanbad (Tobe designated as I)

Sensor Specification:

AvailableConnection External: Carbon Steel, 304SS, 316SS, 304L&316L.

and MOC Internal:316SS

TorqueTube 316SS, Inconnel., KMonel&Hastelloy

Process Connections N.P.T,S.W.or Flanged.

Max. Working Pressure... ....... 150kg/cm2 (150,300,600,900 &1500 classANSI)

Rated Process Temp (-)50degC to(+)350 degC (Coolingfins are providedfor Process
Temperatures above 150 degC)

Note:
In case of two S.G.'s mentioned in the technical details,the instrument will be calibrated at one of the S.G(miniml,.Jm
one )and Ifitis required to calibrate at the other S.G., then Re-calibration is to be done at your site.

Fig.2

Cut-away view of 401 ES type Displacer Sensor

3
 [~ Automp.t,]
... the level & gas people
MODEL DESCRIPTION

II III VI

I) Electrical Classification
Weather Proof W
Ex-Proof E
Intrinsically Safe I
II) Transmitter Action ..
Transmitter Direct with proportional output -D
Transmitter Reverse with proportional output - R
III) Style Description II(
Top Bottom 1
Top Side 2
Side Side 3
Side Bottom 4
Top Internal 5
Side Internal 6
IV) Material Of Construction
PARTS CS SS304 SS316 TEFLON LINED
CAGE, CAGE HEAD A B
& FLANGE C 0

1.1.HOUSING
1.1.

DISPLACER
& DISP.STEM

V) Size of the Process Connection

(FOR STYLE 1- 4)
(FOR STYLE 5- 6)
1" NPT - 1 2" 300# -6
1" SW - 2 2" 600# - 7 3" 150# - 1
2" NPT - 3 2" 900# - 8 3" 300# - 2
2" SW - 4 Others - 9 4" 150# - 3
2" 150# - 5 4" 300# - 4
Others-5
VI) Displacer Length
R= mm (Minimum 100 mm & Maximum 4.5 meter)
MODEL DESCRIPTION WITH EXAMPLE - 401 ES -1- II - III - IV - V - VI - VI
401ES - E-D-3-B-F-J-N-6-356mm
401ES-Smart type Displacer Level transmitter with explosion proof housing, direct action, with
side - side mounting ,cage ,cage head, Process connection & torque tube housing of SS304 With
Inconel torque tube & 316SS displacerwith 2"300 # process connection with range 356mm.

V.AUTOMAT & INSTRUMENTS (P) LTD.

Automat House, F-61, Okhla Industrial Area, Phase-I, New Delhi-20 (INDIA)
Ph.: 26816349, 26817268, 26810307, 26810280 Fax: 91-11-26819440
E-mail: vautomat@vsnl.com Website: www.vautomatindia.com

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