Vega Vegadif 44, Vegadif 51, Vegadif 35, Vegadif 34, Vegadif 45 Operating Instructions

Download

Operating Instructions

VEGADIF 34 … 51

Level and Pressure

Contents

Safety information ......................................................................... 3

Note Ex-area ................................................................................ 3

1 Product description

1.1 Function and configuration ................................................... 4

1.2 Types and versions .............................................................. 5

1.3 Type plate ............................................................................. 7

1.4 Technical data ....................................................................... 8

1.5 Dimensions ......................................................................... 15

1.6 Approvals ........................................................................... 20

2 Mounting

2.1 Verifying operating conditions ........................................... 21

2.2 Pre-installation ..................................................................... 22

2.3 Mounting .............................................................................. 24

3 Electrical connection

3.1 Connection instructions ...................................................... 28

3.2 Load resistance .................................................................. 28

3.3 Connections ........................................................................ 29

3.4 Ex-applications ................................................................... 30

Contents

4 Setup

4.1 Adjustment structure .......................................................... 32

4.2 Adjustment with 4-key adjustment element ....................... 32

4.3 Adjustment with HART® handheld ...................................... 38

4.4 Adjustment with PC ............................................................ 46

2 VEGADIF 34 … 51

Contents

5 Typical installation connections

5.1 Valves .................................................................................. 53

5.2 Impulse lines ....................................................................... 54

5.3 Differential pressure measurement ................................... 55

5.4 Level measurement ............................................................ 57

5.5 Flow measurement ............................................................. 65

6 Diagnostics

6.1 Failure codes ...................................................................... 69

7 Instrument modification ......................................................... 70

Safety information

The described module must only be installed and operated as described in these operating instructions. Please note that other action can cause damage for which VEGA does not take responsibility.

VEGADIF 34 … 51 3

Note Ex-area

Please note the approval documents (yellow binder), and especially the included safety data sheet.

1 Product description

Product description

1.1 Function and configuration

Function

VEGADIF 34 … 51 differential pressure transmitters are an efficient, modular instrument series for differential pressure, level and flow measurement.

The sensor element of VEGADIF 34 and 44 is a single-chamber ceramic measuring cell. It consists of a disk-shaped ceramic body with ceramic diaphragms on both sides. According to the pressure the diaphragms move and the capacitances change. The difference of the individual capacitances is reciprocally proportional to the difference of the pressures.

The sensor element of VEGADIF 35, 45 and 51 is a silicium plate with pressure sensitive resistors. The differential pressure to be measured is received via separating diaphragms and transmitted to the sensor element via incompressible oil (silicone oil or inert oil). The silicium plate moves according to the differential pressure. The values of the resistors change (piezoresistive principle).

The capacitance or resistance values are detected by the integral electronics and converted into a 4 … 20 mA output signal. This output signal is proportional to the difference of the pressures. Precise digital processing of measured data with maximum resolution ensures excellent technical performance.

The external power supply is provided via a separate supply instrument, e.g.:

- power supply instrument (e.g. VEGASTAB 690)

- processing unit with integral direct voltage source (e.g. active DCS-input)

- VEGAMET series 500 or 600 signal conditioning instrument, VEGALOG 571 processing system or VEGADIS 371 indicating instrument

Configuration

Each VEGADIF consists of only two modular components:

- the electronics housing

- the measuring cell housing.

Sensor specific data are permanently stored in an ASIC in the sensor. Hence the measuring cell modules can be changed, e.g. ceramic for silicium and vice versa. The electronics can be changed, e.g. from 4 … 20 mA standard to 4 … 20 mA with HART®-communication protocol, without dismounting the transmitter.

The electronics in the pressure transmitter requires a supply voltage of 11.5 … 45 V DC.

4 VEGADIF 34 … 51

Product description

1.2 T ypes and versions

VEGADIF 34

Measuring cell: ceramic-capacitive

Process connection: acc. to DIN 19 213

Standard application: Differential pressure and flow measurement with gases, vapours and liquids

VEGADIF 35

Measuring cell: silicium-piezoresistive with metal separating diaphragms

Process connection: acc. to DIN 19 213

VEGADIF 34

Standard application: Differential pressure and flow measurement with gases, vapours and liquids, with differential pressure up to 40 bar and static pressures up to 420 bar

VEGADIF 35

VEGADIF 44

Measuring cell: ceramic-capacitive

Process connection: Plus side flange, minus side acc. to DIN 19 213

Standard application: Level measurement in pressurized vessels, even with suspended solids, abrasive or high viscosity products

VEGADIF 34 … 51 5

VEGADIF 44

VEGADIF 45

Measuring cell: silicium-piezoresistive with metal separating diaphragm

Process connection: Plus side flange, minus side acc. to DIN 19 213

Standard application: Level measurement in pressurized vessels, even with product temperatures up to 400°C

VEGADIF 51

Measuring cell: silicium-piezoresistive with metal separating diaphragms

Product description

VEGADIF 45

Process connection: Cell isolating diaphragm in standard series, connected via capillary lines

Standard application: Level, differential pressure and flow measurement especially with high-viscosity products, high temperatures and in food processing industries

For applications in hazardous areas as well as overfill protection acc. to WHG certified instruments are available

6 VEGADIF 34 … 51

VEGADIF 51

Product description

1.3 T ype plate

Check before mounting and electrical connection that you are using a suitable differential pressure transmitter. Observe type and calibration plate which are located as follows:

Calibration plate

Both plates include important data required for mounting and connection. The configuration and contents of the plates are explained in the following example.

Type plate

Product coding example

type DIF35AC4E1VH3C

Process connection flange

1.4435 Measuring cell seal PTFE 2 ventilation valves, 1 mounting loop Nominal value calibration in mbar/bar Nom. meas. range 160 mbar, static pressure max. 140 bar LC-indication top Cable entry Pg 13.5

Configuration of the calibration plate (example)

Cal. Adj. 0 … 160 MBAR

Calibration range 0 … 160 mbar

Configuration of the type plate (example)

Order Code Ser.-No. p

Pmax 4…20mA U

Mat.

1 Basic data of the order no. 2 Serial number

VEGADIF 34 … 51 7

DIF35 AC4E1 VH 3C

10612892

-160 … 160 mbar 140 bar

1.4571 PTFE

VEGA VEGADIF

Made in Germany

11,5 … 45 V DC

Product description

1.4 T echnical data

Mechanical data

Materials, wetted parts

VEGADIF 34

- Diaphragm Aluminiumoxideceramic (Al2O3)

- Process seal FPM, Hastelloy C4 PTFE-plated, EPDM,

- Process connection carbon steel C22.8 chromized 1.0460,

- Ventilation valves stainless steel 1.4571 or 1.4404, Hastelloy C276

VEGADIF 35

- Separating diaphragms stainless steel 1.4401

- Process seal FPM, NBR, PTFE, FPM for oxygen

- Process connection carbon steel C22.8 chromized 1.0460

- Ventilation valves stainless steel 1.4571 or 1.4404, Hastelloy C276

VEGADIF 44

- Diaphragm Aluminiumoxideceramic (Al2O3)

- Process seal FPM, Hastelloy C-4 PTFE-plated, EPDM,

- Process connection (plus side) carbon steel C22.8 chromized 1.0460,

- Process connection (minus side) carbon steel C22.8 chromized 1.0460,

FPM for oxygen application, Kalrez

stainless steel 1.4571 or 1.4404, Hastelloy C276

2.4819, PVDF (PN 10)

2.4819 (only with process connection Hastelloy)

applications

stainless steel 1.4571 or 1.4404, Hastelloy C276

2.4819

2.4819 (only with process connection Hastelloy)

FPM for oxygen application, Kalrez

stainless steel 1.4571, stainless steel 1.4571 PTFE coated Hastelloy C276 2.4819

stainless steel 1.4571 or 1.4404, Hastelloy C276

2.4819

VEGADIF 45

- Isolating diaphragm stainless steel 1.4435

- Process flange (plus side) stainless steel 1.4435

- Process flange (minus side) carbon steel C22.8 chromized 1.0460,

VEGADIF 51

- Isolating diaphragm stainless steel 1.4435

- Process connection carbon steel C22.8 chromized 1.0460,

8 VEGADIF 34 … 51

stainless steel 1.4571 or 1.4404, Hastelloy C276

2.4819

stainless steel 1.4571 or 1.4404, Hastelloy C276

2.4819

Product description

Materials, non-wetted parts

Common components

- Electronics housing and cover Al-casting (Cu-free), protective coating Polyester based, colour yellow RAL 1018, black RAL … (cover)

- Type plates stainless steel 1.4301

- O-rings for cover seal NBR

- Screws and nuts

for measuring cell housing or process connection carbon steel C22.8

- Mounting loop corresponding to process connection carbon steel C22.8, stainless steel 1.4571

VEGADIF 34

- Fill fluid of the measuring cell silicone oil, mineral oil, Voltalef 1 A

VEGADIF 35

- Measuring cell housing stainless steel 1.4571

- Fill fluid of the measuring cell silicone oil, Fluorlube

VEGADIF 44

- Fill fluid of the measuring cell silicone oil, mineral oil, Voltalef 1 A

VEGADIF 45 and VEGADIF 51

- Measuring cell housing stainless steel 1.4571

- Fill fluid of the measuring cell silicone oil, vegetable oil, glycerine, high temperature oil, oil for oxygen applications

- Capillary line stainless steel 1.4571

- Fill fluid of the measuring cell silicone oil, Fluorlube

Weights

VEGADIF 34 approx. 5 kg VEGADIF 35 4 … 6 kg, depending on version VEGADIF 44 8 … 10.5 kg, depending on flange size VEGADIF 45 6 … 12 kg, depending on flange size and

extension length

VEGADIF 51 4 kg plus capillaries and flange isolating

diaphragm

Isolating diaphragm see tables in "1.5 Dimensions - Isolating

diaphragm"

Sea water resistance (salt spray test acc. to DIN 50 021 passed for 504 h)

for applications in pure gases

VEGADIF 34 … 51 9

Electrical data

Product description

Connection

Cable entry Pg 13.5 (for cable-ø 9 … 12 mm)

Screw terminals for conductor cross-sections up to 2.5 mm Earth terminal for conductor cross-sections up to 4 mm

Supply and signal circuit (4 … 20 mA-signal)

Supply voltage

- not Ex-instruments 11.5 … 45 V DC

- Ex-instruments 11.5 … 30 V DC Residual ripple no influence at USS £ 4.5 V Output signal 4 … 20 mA linear (differential pressure proportio

nal) or square root (flow proportional changeable) Resolution better than 6 µA Current limitation approx. 23 mA Measuring range decrease 2.8 mA (standard) or 4 mA Measuring range exceed 20.5 mA acc. to NAMUR Fault signal (adjustable) 3.6 mA, 21.5 mA, current value Integration time

0 … 16 s with keys on the instrument

0 … 40 s with HART® handheld Adjustment period 0.5 … 2.0 s depending on measuring range Raising time 0.4 … 1.6 s depending on measuring range Heating time 2 s Connection line 2-wire Max. permissible load depending on supply voltage

1560

1000

in Ohm

R total

500

Load

20 28,5 37 4511,5

Voltage of the external energy UH in Volts

Supply and signal circuit (digital communication signal HART®)

Connection line 2-wire (the communication must not be influenced

by unshielded cables) Line resistance £ 25 W/km Total resistance higher than 250 W (communication resistance of

min. 250 W required) Total capacitance smaller than 180 nF Max. length 1000 m

with smaller cable diameter a suitable seal must be provided by the customer

adjustment time of 10 % … 63 % of the measuring range final value

10 VEGADIF 34 … 51

Product description

Protective measures

Protection IP 65

IP 68 (option for VEGADIF 35, 45 and 51)

Protection class III

CE-protective measures

VEGADIF 34, VEGADIF 35, VEGADIF 44, VEGADIF 45 and VEGADIF 51 differential pressure transmitters meet the protective regulations of EMC (89/336/EWG) and NSR (73/23/EWG). The conformity has been judged acc. to the following standards: EMC Emission EN 50 081 - 1

Susceptibility EN 50 082 - 2

NSR EN 61 010

NAMUR-regulations

Full compliance with the NAMUR-regulations NE21, May 1993.

Transmission reaction

Measuring ranges

VEGADIF 34 and VEGADIF 44

Features Limits Span System pressure Pressure transmission Nom. liquid meas. Initial Final value minimum maximum Overload Overload in the sensor ranges value unilateral bilateral

25 mbar -25 mbar 25 mbar 5 mbar 25 mbar 10 bar 10 bar silicone oil 100 mbar -100 mbar 100 mbar 5 mbar 100 mbar 16 bar 2)25 bar 2)silicone oil 500 mbar -500 mbar 500 mbar 25 mbar 500 mbar 100 bar 2)140 bar 2)mineral oil 3000 mbar -3000 mbar 3000 mbar 150 mbar 3000 mbar 100 bar 2)140 bar 2)mineral oil

VEGADIF 35, VEGADIF 45 and VEGADIF 51

Features Limits Span System pressure Pressure transmission Nom. liquid meas. Initial Final value minimum maximum Overload Overload in the sensor ranges value unilateral bilateral

10 mbar 40 mbar 160 mbar -160 mbar 160 mbar 10 mbar 160 mbar 140 bar 140 bar silicone oil 1000 mbar -1000 mbar 1000 mbar 50 mbar 1000 mbar 420 bar 4)420 bar 4)silicone oil 6000 mbar -6000 mbar 6000 mbar 300 mbar 6000 mbar 420 bar 4)420 bar 4)silicone oil 40000 mbar3)-40000 mbar 40000 mbar 2000 mbar 40000 mbar 100 bar 420 bar 4)silicone oil

-10 mbar 10 mbar 2 mbar 10 mbar 140 bar 140 bar s ilicone oil

-40 mbar 40 mbar 5 mbar 40 mbar 140 bar 140 bar s ilicone oil

Minimum pressure

VEGADIF 34, 35 and 44 1 mbar VEGADIF 45 and 51 10 mbar

in applications with pure gases Voltalef 1 A

10 bar with process connection PVDF for VEGADIF 34; 40 bar with process flange for VEGADIF 44

only VEGADIF 35

note nominal pressure of the flanges

VEGADIF 34 … 51 11

abs

Product description

Output characteristics

Determination of characteristics fixed point method acc. to VDI/VDE 2600, sheet 4

(corresponds to the limit point adjustment acc. to DIN 16 086)

Characteristics linear (differential pressure proportional),

changeable to square root (flow proportional)

Accuracy data

Feature Accuracy

Hysteresis Repeatability

Instrument

VEGADIF 34 better than 0.1 % better than 0.05 % better than 0.05 % VEGADIF 35 better than 0.1 % better than 0.1 % better than 0.1 % VEGADIF 44 better than 0.1 % better than 0.05 % better than 0.05 % VEGADIF 45 better than 0.2 % better than 0.1 % better than 0.1 % VEGADIF 51 better than 0.2 % better than 0.1 % better than 0.1 %

Long-term stability of the zero signal

better than 0.1%/12 months (VEGADIF 34 and 44) better than 0.2%/12 months (VEGADIF 35, 45, 51)

Influence of other actuating variables

Influence of the static pressure to zero and span better than 0.2 %/PN (VEGADIF 34 and 44)

better than 0.2 %/100 bar (VEGADIF 35, 45, 51) Electromagnetic compatibility (EMC) interference immunity to NAMUR: 30 V/m Influence of vibration

5) 6)

better than ±0.1 % acc. to DIN/IEC 68, part 2 - 6 Climatic class GPC acc. to DIN 40 040 Calibration position upright Influence of the mounting position max. 2 mbar

Temperature influence

Average temperature influence of the zero signal

3) 4)

or the output span better than 0.02 %/10 K (+10 … +60°C)

better than 0.1 %/10 K (-40 … + 10°C a.

60°C…85°C)

Similar to DIN 16 086

relating to the nominal measuring range with recommended turn-down limit of 20 : 1

relating to the nominal measuring range, reference temperature 25°C, with recommended turn-down limit of 20 : 1

with VEGADIF 45 and 51 without isolating diaphragm or capillaries, see temperature influence

relating to the nominal measuring range

with silicium measuring cell measured on 6000 mbar sensor

12 VEGADIF 34 … 51

Product description

Additional temperature influence 1) with VEGADIF 45:

- by isolating diaphragm

Process connection effective Temperature coefficient

diaphragm-ø [mbar/10 K]

Flange DN 50 PN 40 acc. to DIN 2501, Seal surface acc. to DIN 2526 form D 46 mm 5.0 Flange DN 80 PN 40 acc. to DIN 2501, Seal surface acc. to DIN 2526 form D 70 mm 3.0 Flange DN 80 PN 40 with extension 50 mm 70 mm 3.0 Flange DN 80 PN 40 with extension 100 mm 70 mm 3.0 Flange DN 80 PN 40 with extension 150 mm 70 mm 3.0 Flange DN 80 PN 40 with extension 200 mm 70 mm 3.0

Additional temperature influence

with VEGADIF 45:

- by isolating diaphragm

Isolating diaphragm series effective Temperature coefficient

diaphragm-ø [mbar/10 K]

unilateral bilateral

Cell DN 50 PN 16/400 46 mm 3.0 0.5 Cell DN 80 PN 16/400 70 mm 0.7 0.1 Cell DN 100 PN 16/400 70 mm 0.7 0.1 Cell 3" class 150/2000 2

/4" 0.7 0.1 Cell 4" class 150/2000 23/4" 0.7 0.1 DIN 11 851, nut DN 50 PN 25 46 mm 3.0 0.5 DIN 11 851, nut DN 65 PN 25 52 mm 1.0 0.2 DIN 11 851, nut DN 80 PN 25 71.5 mm 0.7 0.1 DIN 11 851, socket DN 50 PN 25 46 mm 3.0 0.5 DIN 11 851, socket DN 65 PN 25 52 mm 1.0 0.2 DIN 11 851, socket DN 80 PN 25 71.5 mm 0.7 0.1 Clamp 2" PN 25 45 mm 3.0 0.5 Clamp 3" PN 25 71.5 mm 0.7 0.1 DRD-flange DN 25 46 mm 1 .5 0.25

- by capillary line 2) per m 0.5 mbar/10 K (unilateral)

0.12 mbar/10 K (bilateral)

Operating conditions

Product features

Aggregate gaseous, vapour, liquid to high viscosity Condition also abrasive or aggressive with suitable

standard values relating to isolating liquid silicone oil

both capillary lines are supplied with the same length

VEGADIF 34 … 51 13

material selection of wetted parts acc. to order code

Product description

Temperatures

Ambient temperature -40°C … +85°C (for indication: -20°C … +85°C)

Medium temperature

- VEGADIF 34 and VEGADIF 44 FPM (Viton, Fluor-caoutchouc) -20°C … +85°C PTFE (Hastelloy C4, from p EPDM -40°C … +85°C

³ 900 mbar) -40°C … +85°C

abs

FPM (Viton for oxygen, oil and grease free) -10°C … +85°C Kalrez -10°C … +85°C

- VEGADIF 35 and minus side VEGADIF 45 FDM (Viton, Fluor-caoutchouc) -20°C … +85°C NBR -20°C … +85°C PTFE, from p FPM (Viton for oxygen, oil and grease free) -10°C … +85°C

³ 1 mbar -40°C … +85°C

abs

- Plus side VEGADIF 45 and VEGADIF 51 Isolating liquid: p

- silicone oil -40°C … +200°C / -40°C … +180°C

³ 1 bar / 0.05 bar £ p

abs

- vegetable oil -10°C … +200°C / -10°C … +120°C

- glycerine +15°C … +200°C / – ––

- high temperature oil -10°C … +350°C / -10°C … +200°C

- oil for oxygen application -40°C … +175°C / -40°C … +80°C

Storage and transport temperature -40°C … +100°C (VEGADIF 34 and 44)

-50°C … +100°C (VEGADIF 35, 45 and 51)

Ex-technical data CENELEC

General data

Classification mark EEx ia IIC T4/T6

Intrinsically safe supply and signal circuit

Classification EEx ia IIC Only for connection to certified, intrinsically safe circuits with the max. values:

- voltage UO = 30 V

- current IK = 300 mA

- efficiency P = 1 W

Inner effective capacitance C Inner effective inductance L

Ambient conditions

Ambient temperature around the oscillator

- temperature class T6 -40°C … +40°C

- temperature class T5 -40°C … +55°C

- temperature class T4 -40°C … +85°C

= 11.2 nF

int

= 0.2 mH

int

abs

< 1 bar

at p

< 1 bar (vacuum range) the isolating liquid boils already at lower temperatures

abs

14 VEGADIF 34 … 51

Product description

0-500 mbar

2 5 0

Z S

1.5 Dimensions

VEGADIF 34

104

View x

150

136

255

41,3

255

41,3

with PVDF-flange

VEGADIF 35

M10

/16 - 20 UNF

/4" - 18 NPT

54 82

M10

/16 - 20 UNF

Mounting loop (optional)

PVDF

/4" - 18 NPT

View y

235

41,3

85 (93)

100 (135)

The values in brackets relate to PN 420

VEGADIF 34 … 51 15

M10 (M12)

/16 - 20 UNF

/4" - 18 NPT

106 (110)

VEGADIF 44

;

;;;;;;;

DIN-flange DN 80/DN 100 ANSI-flange 3"

Product description

M10

/16 - 20 UNF

/4" - 18 NPT

VEGADIF 45

M10

/16 - 20 UNF

/4" - 18 NPT

M10

/16 - 20 UNF

/4" - 18 NPT

A = Installation height D = Outer flange diameter b = Flange thickness k = Diameter of hole circle d2= Diameter of hole d4= Seal ledge diameter d5= Extension diameter RL= Extension length dM= Diaphragm diameter

16 VEGADIF 34 … 51

Product description

Flange connection acc. to DIN 2501, seal ledge acc. to DIN 2526 form D

Order Flange Holes Seal ledge Dia. Extension Install. code Size/Nominal pressure D b k No. d2d

dMR

d5dMheight A

B DN 50 / PN 40 165 20 125 4 18 102 46 –– –– –– 360 C DN 80 / PN 40 200 24 160 8 22 138 70 –– –– – – 360 D DN 80 / PN 40 200 24 160 8 22 138 –– 50 76.5 70 360 E DN 80 / PN 40 200 24 160 8 22 138 –– 100 76.5 70 360 F DN 80 / PN 40 200 24 160 8 22 138 –– 200 76.5 70 360 G DN 100 / PN 40 235 26 190 8 26 162 70 –– 76.5 70 360

Flange connection acc. to ANSI B 16.5

Order Flange Holes Seal ledge Dia. Extension Install. code Size/Nominal press. D b k No. d

in lb/sq in in/mm in/mm in/mm in/mm in/mm in/mm in/mm in/mm in/mm A

P 2 / 150 6/152

/4 /43/4/43/4/35/8/13/4/ –– –– –– 14.2/

19.5 120.7 20 92 46 360

R 3 / 150 8.25/

/16 /6/ 43/4/5 /23/4/ –– –– –– 14.2/

191 24 152.4 20 127 70 360

S 3 / 150 8.25/

/16 /6/ 43/4/5/–– 2/ 3/23/4/ 14.2/

191 24 152.4 20 127 50.8 76.5 70 360

T 3 / 150 8.25/

/16 /6/ 43/4/5/–– 4/ 3/23/4/ 14.2/

191 24 152.4 20 127 101.6 76.5 70 360

U 3 / 150 8.25/

/16 /6/ 43/4/5/–– 8/ 3/23/4/ 14.2/

191 24 152.4 20 127 203.2 76.5 70 360

W 4 / 300 10/ 1

/2 /78/9/814/16/62/9/23/4/ –– –– –– 14.2/

254 32 200.1 23 158 70 360

d4d

d5d

height

VEGADIF 34 … 51 17

;

;;;;;;;

VEGADIF 51

;

/16 - 20 UNF

/4" -

18 NPT

Isolating diaphragm as cell version, AA … CR

Product description

acc. to DIN 2501

Order Socket Cell Min. mounting Max. Weight code Size/Nominal pressure D b d

distance A pressure approx.

AA DN 50 PN 16 102 20 46 130 400 bar 2.6 kg AK DN 80 PN 16 138 20 70 130 400 bar 4.6 kg AM DN 80 PN 16 PTFE 138 20 70 130 400 bar 4.6 kg AN DN 80 PN 16 Hastelloy 138 20 70 130 400 bar 4.6 kg AR DN 100 PN 16 158 20 70 130 400 bar 6.2 kg

acc. to ANSI 16.5

Order Socket Cell Min. mounting Max. Weight code Size/Nom. pr. D b d

in / lb sq in in/mm in/mm in/mm A in/mm lb/sq in

CK 3 / 150 71/2 / 1343/4 / 20 23/4 / 70 5 / 130 –– 4.5 kg CR 4 / 150 81/4 / 1583/4 / 20 23/4 / 70 5 / 130 2500 6.2 kg

18 VEGADIF 34 … 51

distance pressure approx.

Product description

;;;;;;;;;;

Isolating diaphragm as cone socket with compression nut, FA … FK

acc. to DIN 11 851

Order Socket Cell Compression nut Min. mount. Weight code Size/Nominal pr. D f dMG k m distance A approx.

FA DN 50/PN 25 68 11 46 Rd78x FE DN 65/PN 25 86 12 52 Rd95x1/6" 25 21 120 4.0 kg FK DN 80/PN 25 100 12 71.5 Rd110x1/4" 29 25 120 5.1 kg

/6" 22 19 120 2.2 kg

Isolating diaphragm as threaded socket, GA … GK

acc. to DIN 11 851

Order Socket Threaded socket Min. mounting Weight code Size/Nominal pres. d1GdMdistance A approx.

GA DN 65/PN 25 66 Rd95x1/6" 52 110 3.4 kg GK DN 80/PN 25 91 Rd110x1/6" 71.5 110 4.0 kg

GA DN 50/PN 25 60 Rd78/

/6" 46 110 1.8 kg

Isolating diaphragm as Clamp, HA and HK

Order Socket Terminal socket Min. mounting Weight code Size/Nominal pres. D d

HA DN 2" PN 40 64 46 100 1.4 kg HK DN 3" PN 40 91 71.5 100 2.4 kg

distance A approx.

Isolating diaphragm as DRD-flange, KE

Order Socket Dimensions Min. mounting Weight code Nominal pr. dMdistance A approx.

˘64 ˘84 ˘105

VEGADIF 34 … 51 19

KE PN 25 see drawing 46 100 1.5 kg

Product description

;

105 119

Mounting bracket Installation instructions

;;;;;;

ø60

~195 ~274

105

312,5

View y

View x

35 35

4 holes ø 10.4 mm

126

222

126

106

165

106

Z S

1.6 Approvals

For these applications the appropriate official documents (test reports, test certificates and conformity certificates) have to be noted. These are supplied with the appropriate instrument.

Survey on the approvals which are in preparation or for which we applied

Approval CENELEC CENELEC PTB-Zone 0 FM FM WHG

Type and non incentive safe

VEGADIF 34 • • • • • •

VEGADIF 35 • • • • • •

VEGADIF 44 • • • • • •

VEGADIF 45 • • • • • •

VEGADIF 51 • • • • • •

20 VEGADIF 34 … 51

EEx ia IIC EEx d IIC EEx ia IIC Explosion proof Intrinsically

Mounting

2 Mounting

2.1 Verifying operating conditions

VEGADIF is a rugged transmitter for precise differential pressure, level and flow measurement. The accuracy of the measurement mainly depends on the correct installation and the connection of the impulse lines.

Detailed information for differential pressure measurement in aggressive products as well as further information on wiring and coordination of valves, measuring lines and components is given in the VDI/VDE-regulations 3512 as well as DIN 19 201 and DIN 1952. Further information on level measurement is stated in the VDI/VDE-regulations 3519.

The differential pressure transmitter used must meet the technical and safety requirements of the application. Therefore check from the type plate, calibration plate and order code the following data:

Nominal pressure

The pressure stage rating of VEGADIF must be above the operating pressure of the process.

Measuring range

The measuring range is calibrated (factory set) acc. to the order. The pressure values adjusted for zero and span are documented on the calibration plate. The values must cover the application. If an adaptation is necessary, this should be carried out acc. to section 4 Setup.

Materials of wetted parts

The material of the wetted parts must be sufficiently resistant. Use the respective material tables for control. A table is given in the product information to VEGADIF, for more information we recommend the VEGA-resistance lists.

Ambient temperature

The ambient temperature in the installation place must be in the range of -40°C … +85°C. The surface temperature of the electronics housing must not exceed +85°C. Hence it should be noted that the electronics housing should not be heated to more than +85°C due to radiation by neighbouring instruments or systems. If temperatures below -40°C are expected at the installation, the transmitter should be installed in a temperature isolated and heated protection box. If there is danger that measured product or condensate freezes in the process connection or on the measuring cell, the transmitter must be installed in a warmer place or in a heated protection box for process connections and process seals. Similar measures should be taken to protect the impulse lines.

Medium temperature

The permissible medium temperature depends on the process seal, the measuring cell and the isolating liquid. When VEGADIF 45 or 51 are used, note that the product temperature can differ between plus and minus side.

Moisture

Mount horizontally installed instruments such that the cable entry points to the bottom to avoid moisture ingress. The sensor housing is therefore rotational by approx. 350°. For vertically installed instruments loop the connection lines in a bow pointing to the bottom to the instrument housing, so that rain or condensation water can drain off the cable. This is mainly valid for mounting outside, in humid areas (e.g. by cleaning processes) or on cooled or heated vessels.

VEGADIF 34 … 51 21

Mounting

2.2 Pre-installation

Selection of the installation location

The selection of a suitable installation location under extreme ambient conditions is needed for

- quality of the measurement

- a long lifetime of the transmitter

- low maintenance expenses.

Note the following regulations:

Installation level

• For level measurements install below the

minimum level (the diaphragm or the isolating diaphragm must be completely covered).

• For measurement of gases, install transmit-

ter above the pressure tapping points.

• For the measurement of vapours and liq-

uids, install transmitter below the pressure tapping points.

Mounting locations

• Mount the transmitter as near as possible to the pressure tapping points.

• Keep impulse lines as short as possible.

• Mounting and maintenance work should be carried out without obstruction.

• The transmitter, the tapping points, the impulse lines and the valves should be easily accessible.

• If available, the mounting place should provide a good view to the LC-display.

Adaptation of the transmitter

For optimum adaptation of your VEGADIF to the installation place the following measures can be carried out:

Rotate the electronics housing

After loosening the locking screw below the electronics housing, the housing can be rotated by approx. 330°. A stop prevents further turning. Hence the terminal compartment can be set to an optimum position for cable entry or the LC-display into an optimum reading position.

Fig. 2.1 Loosen the locking screw

When the best position is reached, tighten the locking screw again.

Ambient influences

• Keep the vibration and shock effect to a minimum.

• Avoid corrosive ambient atmosphere.

• Reduce condensation to a minimum.

Note:

Under arduous ambient conditions, a protective housing is recommended.

22 VEGADIF 34 … 51

Fig. 2.2 Fastening of the locking screw

Mounting

Rotating the display

If the integrated display is not correctly positioned it can be rotated in 90°-steps after opening the housing cover.

Avoid exposure of the electronics compartment and carry out these measures if possible in a workshop.

1 Unscrew the display cover

2 Push the protruding clamp with a screw-

driver outwards

3 Tilt the display in this position and take

out

Note

Do not turn more than 2 x 90° to the left or right, otherwise the connection cable may be damaged.

5 Insert the display into the clamp and

snap-in

6 Replace the outer cover

Remove the protective plugs

Transmitter or isolating diaphragm are provided with protective plastic plugs. Remove them before installation.

4 Rotate display as needed

VEGADIF 34 … 51 23

Mounting

2.3 Mounting

2.3.1 VEGADIF 34, 35 and 51

The differential pressure transmitter mounting is generally fixed. There are three versions with VEGADIF 34, 35 and 51:

- pipe mounting (2“-pipe)

- wall mounting

- mounting on a valve block

Hanging the transmitter on the impulse lines is not recommended, nor with capillary lines.

For correct mounting VEGA offers a universal mounting kit consisting of:

- a mounting bracket

- a pipe shackle for 2“-pipes (up to outer-ø 63 mm)

- two hexagon nuts M8 with plain washers

- four hexagon screws (7/16 UNF or M10 x 182))

For easy removal of the transmitter a three or five valve manifold can be mounted to the transmitter 1).

In this case the valve block can be mounted with the mounting kit to a pipe or wall instead of the transmitter. The impulse lines can be sealed via valves and the manifold with the connected impulse lines can be left in place after removal of the transmitter.

Pipe mounting

Use the complete mounting kit and note the following procedure: 1 Hold the mounting bracket in the required

direction on the pipe.

2 Insert the u-bolt via the pipe through the

holes of the mounting bracket.

3 Screw two hexagon nuts to the u-bolt and

fasten the bracket by fastening the nuts on the pipe.

4 Fasten the transmitter to the bracket (the

screws with plain washers pass through the holes of the bracket into the thread).

Mounting on vertical pipe

approx. dimensions in mm

105

165

312,5

Z S

not with VEGADIF 51

M12 x 18 with 420 bar-version of VEGADIF 35

24 VEGADIF 34 … 51

Mounting

Mounting on horizontal pipe

Z S

Wall mounting

Use the following material of the mounting kit:

- bracket

- four hexagon screws

Provide the following material:

- four screws with suitable plugs

Note the following procedure: 1 Screw the bracket by means of the screws

and suitable plugs to the wall.

2 Screw the transmitter to the bracket (the

screws with plain washers pass via the holes of the bracket to the thread).

Mounting with valve block

The valve block is fastened as described before by tube or wall mounting.

Procedure: 1 Fasten bracket to a tube or wall. 2 Screw the valve block to the mounting

bracket with two hexagon screws and plain washers.

The transmitter is normally flanged to the valve block just before setup of the measurement loop.

2.3.2 VEGADIF 44 and 45

The following instructions are given for VEGADIF 44 however are also valid for VEGADIF

45.

Open vessel

The minus side of the transmitter is open to atmospheric pressure. Therefore the open process connection of the minus side should point downwards.

Max.

Min.

atm

Atmospheric pressure on the minus side of the transmitter

1) not with VEGADIF 51

VEGADIF 34 … 51 25

Mounting

Closed vessel

The minus side of the transmitter is connected via an impulse line with the vessel and feels the pressure. The pressure must be above the maximum level. The impulse line should have a block valve.

Block valve

Steam trap

Block valve

If the static pressure is caused by steam above the product the minus side is connected via a condensation leg. Before opening the block valve the impulse line must be filled via the condensation pot.

2.3.3 Isolating diaphragm mounting on VEGADIF 51

The two isolating diaphragms connect the pressure transmitter with the process. The dimensions of the cell isolating diaphragm are dependent to the respective standard flange. The fastening is made by means of a suitable blind flange. Depending upon the flange a seal acc. to DIN 2690 or ANSI B 16.5 must be used.

Mounting

Blind flange

Isolating diaphragm

Seal

Measuring point connection flange

Vessel wall

Level measurement

Block

Condensation pot

valve

Condensate

Steam

Max.

Min.

Recommended mounting

Block valve

26 VEGADIF 34 … 51

Condensation outlet

Mounting

Only permitted with continuous positive pressures.

Differential pressure measurement

Flow measurement

Avoid buildup on the isolating diaphragm of solids or by sticky materials. If possible position the flange connections on top of the pipe.

VEGADIF 34 … 51 27

3 Electrical connection

Electrical connection

3.1 Connection instructions

The electronics of the pressure transmitters requires a supply voltage of 11.5 … 45 V DC. Supply voltage (DC voltage) and current signal are on the same two-wire connection cable to the terminals.

This external supply can be provided via a separate instrument:

- power supply (e.g VEGASTAB 690)

- processing unit with integral DC voltage source (e.g. active DCS-input)

- VEGAMET series 500 or 600 signal conditioning instrument, VEGALOG 571 processing system or VEGADIS 371 indication

Note that the external supply source is reliably isolated acc. to DIN VDE 0106, part 101 from the mains circuits. The above mentioned systems meet these requirements and protection class III is therefore ensured.

For electrical connection note the following instructions:

- The connection must be made acc. to the specific national installation standards (e.g. in Germany acc. to the VDE-regulations).

- The wiring between pressure transmitter and supply can be made by standard twowire cable.

- If strong electromagnetic interference is expected, use screened cable. The screening must be earthed at the sensor end.

- The connection cable for the external supply must never be connected to terminal 3 of the terminal block or to the test plug connection via terminal 1 of the terminal block (danger of damage to the electronics).

- Housing cover and cable entry must be tight after electrical connection, so that humidity ingress to the terminal compartment is avoided.

3.2 Load resistance

Various instruments can be connected to the signal output of the pressure transmitter, e.g.:

- remote transmission systems

- computers

- indicating instruments

- recorders

- controllers etc.

The total resistance of the connected instruments and the connection cable must not exceed the value of the max. load resistance.

The load resistance consists of the line resistance RL, the adjustment resistance RX, and the resistance of the processing system and/or indicating instrument.

This max. load resistance depends on the voltage of the external supply and can be calculated acc. to the following formula:

US – U

= –––––––––

Lmax

US= supply voltage UKl= terminal voltage I

max

The following load diagram is used for simplified determination of this value:

1560

1000

in Ohm

500

total

Load R

max

= max. load resistance

= max. current (approx. 23 mA)

20 28,5 37 4511,5

Supply voltage US in Volts

28 VEGADIF 34 … 51

Electrical connection

3.3 Connections

Electronics powered by the power supply unit

Processing via an indicating instrument.

Ammeter for local testing

1+2–3

–

Transmitter terminals

analogue / digital indicating instrument e.g. VEGADIS

4 … 20 mA

–

Voltage supply

US= power supply UA= voltage loss in the indication instrument UKL= terminal voltage (supply voltage) RL= resistance processing systems and connec-

tion cable (load resistance)

Electronics powered by a VEGA-signal conditioning instrument or a PLC with active input circuit

Processing is made via the PLC or the VEGAMET signal conditioning instrument.

Ammeter for local testing

–

1+2–3

Transmitter terminals

4 … 20 mA

PLC active

0/4 … 20 mA

DISBUS

Note:

An ammeter for local testing of the output current can be connected between terminal 1 and its tag. This measurement can be made during operation without interrupting the supply line.

VEGADIF 34 … 51 29

Electrical connection

3.4 Ex-applications

Applications in Ex-areas require the use of approved instruments.

For these applications the appropriate documents (test reports, test and conformity certificates) should be noted. These are supplied with the appropriate instrument.

Therefore note the attached approval documents (yellow binder) and especially the attached safety data sheet.

The voltage supply in Ex-applications must be only made via an intrinsically safe circuit. There are the following possibilities:

- VEGAMET signal conditioning instrument in Ex-version

- not certified signal conditioning instrument VEGAMET with VEGA-safety barrier type 145

- Ex-separator (e.g. VEGATRENN 149 Ex)

- indicating and supply instrument VEGADIS 371 in Ex-version.

The legal documents of these instruments must also be noted.

Application with supply by Ex-separator, e.g. VEGATRENN 149 Ex

The processing is made by an indicating instrument in the non-Ex-area.

1+2-3

Ex-area

Terminals VEGADIF

Non-Ex-area

e.g. Ex-separator VEGATRENN 149 Ex

4…20 mA

Ex-application with supply via a VEGA non-Ex-signal conditioning instrument with safety barrier type 145

The processing is made via the signal conditioning instrument in the non-Ex-area.

Non-Ex-area

Safety barrier type 145

VEGAMET in non-Ex-version

Ex-area

1+2-3

Terminals VEGADIF

Note

- Carry out the adjustment only with connected safety barrier (reason: the current consumption of approx. 300 µA is considered).

- When connecting a VEGADIS 11 Ex the regulations for wiring of intrinsically safe circuits should be noted.

Determination of the line length in the ia-IIC-circuit

The sum of the inner capacitances and inductances of the components must not exceed the max. permissible values of the ia-IICcircuit.

Example:

ia-IIC-circuit Pressure 1 pce. Line max. total transmitter overv.arrester L L

ext/Cext

int/Cint

0.5 mH 0.2 mH 0.13 mH 0.17 mH

56 nF 11.2 nF 1 nF 44.8 nF

int/Cint

VEGADIS 11

Processing e.g. indicating instrument

Typical values for unshielded two-wire lines: L‘ = 0.00065 mH/m; C‘ = 0.00012 nF/m

30 VEGADIF 34 … 51

Electrical connection

Calculation of L

(cable) = L

int

transmitter) – L

of the cable:

int/Cint

(ia-IIC-circuit) – L

ext

(overvoltage arrester)

int

(pressure

int

= 0.5 mH – 0.2 mH - 0.13 mH

= 0.17 mH

(cable) = C

int

sure transmitter) – C

(ia-IIC-circuit) – C

ext

(overvoltage arrester)

int

(pres-

int

= 56 nF – 11.2 nF - 1 nF

= 44.8 nF

Calculation of the cable length:

0.17 mH

I = –––––––––– • m = 262 m

0.65 µH

44.8 nF

I = ––––––––––– • m = 373 m

120 pF *

To be on the safe side, the cable length in this example should not exceed a value of 250 m.

VEGADIF 34 … 51 31

4 Setup

Setup

4.1 Adjustment structure

The differential pressure transmitters can be setup

- with the PC and the VEGA-adjustment program VVO,

- with the HART® handheld or

- with the integral 4-key adjustment elements.

Adjustment program VVO

With the adjustment program VVO (VEGA Visual Operating) on the PC you adjust the sensors in a very comfortable way. The PC communicates via the interface converter VEGACONNECT 2 with the sensor. The signal and supply line is therefore superimposed by a digital adjustment signal. The adjustment can be made in any position of the signal line, naturally also directly on the sensor.

HART® handheld

Beside the PC and the 4-key adjustment elements, the sensors can be also adjusted with the HART® handheld.

4-key adjustment elements with LCdisplay

If you have neither a PC nor a HART® handheld, the sensors can also be setup directly with the integral 4-key adjustment elements.

4.2 Adjustment with 4-key adjustment element

LC-display in operating mode

According to the ordered version your VEGADIF is provided with an integral LC-display. This display can be retrofitted or removed. The display is located below the upper housing cover behind a glass pane.

The LC-display provides the following information in the adjustment mode:

Span indication during full adjustment

Appropriate pressure value

5 .0 0 0

Zero indication during empty adjustment

Position of zero

Bar graph for measuring span = span – zero

LC-display

The following examples show possible indication values.

Example 1: Meas. range -0.5 … 1.5 bar, LCD in operating mode

Position of span

D p

-0,5 bar

0 bar

1,5 bar

32 VEGADIF 34 … 51

Display I

- 0 .5 0 0

4 mA

- 0 .0 0 0

8 mA

1 .5 0 0

20 mA

Setup

Example 2: Measuring range 0 … 10 bar

D p

0 bar

2,5 bar

10 bar

Display I

0 .0 0

4 mA

2 .5 0

8 mA

1 0 .0 0

20 mA

4-key adjustment elements

Your VEGADIF is provided with the following direct adjustment elements:

- four adjustment keys

- one step switch

The adjustment keys are located below a slide laterally on the electronics housing. The slide is marked with z (zero) and s (span) and can be moved after loosening of the recessed head screws. When moving the slide, two adjustment keys are released, when then rotating the slide, all four adjustment keys are released.

Z S

First of all the slide releases 2 keys and then all four keys

Via these four keys in conjunction with the LCdisplay you can carry out the most important adjustments such as zero, span and bias pressure directly on the transmitter.

If you have a VEGADIF without LC-display, connect to the terminal and to tag 1 an ammeter with measuring range 0 … 20 mA (e.g. digital multimeter). For the exact adjustment connect a precision ammeter. Push the keys with a small screwdriver.

The second adjustment element, the step switch, is located below the LC-display; therefore remove the display, as described under "2.2 Pre-installation“.

The step switch below LC-display

The adjustments on the step switch mean:

- 0 Adjustment with PC or HART®, therefore

damping adjustable from 0 … 40 s

- 2 Damping 0.5 s linear

- 3 Damping 1.0 s linear

- 4 Damping 2.0 s linear

- 5 Damping 4.0 s linear

- 6 Damping 8.0 s linear

- 7 Damping 16.0 s linear

- 8 Adjustment with PC or HART®, there-

fore damping adjustable from 0 … 40 s

- 9 Damping 0 s extracted by root

- A Damping 0.5 s extracted by root

- B Damping 1.0 s extracted by root

- C Damping 2.0 s extracted by root

- D Damping 4.0 s extracted by root

- E Damping 8.0 s extracted by root

- F Damping 16.0 s extracted by root

Current I

linear extracted by root

VEGADIF 34 … 51 33

Dp/p

Setup

Display zero

1 Push +z or –z key 2 Monitor the displayed value and release the

key again.

After approx. 2 s the indication resets automatically to operating mode.

Example for display of zero:

Meas. range Display

-3…0 bar

0…1,5 bar

2,5…-0,5 bar

Display span

1 Push +s or –s key 2 Monitor the displayed value for s and re-

lease the key again

The display resets automatically to operating mode after approx. 2 s.

Examples for display of span:

Meas. range Display

-3…0 bar

- 3 .0 0 0

0 .0 0 0

2 .5 0 0

0 .0 0 0

Data of the factory setting

Measuring range

Your VEGADIF is calibrated acc. to the order. The calibration data is stated on the calibration plate, e.g. 0 … 1000 mbar.

For this measuring range:

- The 4 mA-signal is coordinated to the first

pressure value (in the example 0 mbar).

- The 20 mA-signal is always coordinated to

the second pressure value (in the example 1000 mbar).

Check if the calibrated measuring range corresponds to the application and if necessary readjust, see the following section "Adjustment“.

Integration time

A factory set integration time of 0 s is supplied. Via the step switch this time can be changed from 0 … 16 s, with the PC to 0 … 40 s, to achieve an increased smoothing of the output signal.

Output characteristics

As factory setting a linear characteristics is adjusted. A square root output can be selected with the step switch.

Electronics replacement

The calibration data is stored in the EEPROMmemory of the electronics. Always check the data when replacing the electronics and modify if necessary.

Adjustment

0…1,5 bar

2,5…-0,5 bar

This adjustment effects an inversion of the current output

34 VEGADIF 34 … 51

1 5 0 0

- 5 0 0 .0

First note the adjustment ranges for zero and span. The values are stated under "1.4 Technical data - Transmission reaction“. Make sure that your requested values are within the possible adjustment range.

Setup

Two methods are available for adjustment

- adjustment without pressure (dry)

- adjustment with pressure (wet)

The dry adjustment can be made before mounting in the workshop or after mounting at the measuring point. Note with the adjustment before mounting, that the position of the transmitter corresponds to the intended installation position. This is particularly necessary for VEGADIF 45 and 51 with isolating system or capillaries. Use for sensors without display a precision ammeter (class 0.03 or better) to adjust the current output.

Adjustment without pressure (dry)

Reduce zero

1 Push key z– twice and hold. 2 Note the change of the current. 3 When the requested current value is

reached, release z–.

4 The display resets automatically to operat-

ing mode after approx. 2 s and the adjusted value is saved.

Example: given: 0 … 1000 mbar, (z = 0 mbar, s = 1000 mbar) z to be changed to: z = -500 mbar

Example: given: 0 … 1000 mbar, (z = 0 mbar, s = 1000 mbar) to be changed to: s = 500 mbar

Push the key s– twice and hold until 500 mbar are adjusted.

Adjustment with pressure (wet)

For the adjustment with pressure, VEGADIF must be connected to a variable pressure source, e.g.:

- a pressure calibrator

- directly to the process

Adjust zero with display

1) Set pressure precisely for zero (e.g. 0 bar) and check via the display.

2) Push key z+ and z– together.

The pressure (e.g. 0 bar) corresponds to the output current 4 mA.

Adjust span with display

1) Set pressure precisely for span (e.g. 1 bar) and check via the display.

2) Push key s+ and s– together.

Increase zero

Push the key z+ twice and hold. The procedure is the same as above.

Reduce span

1 Push key s– twice and hold. 2 Note the change of the current. 3 When the requested current value is

reached, release s–.

4 The display resets automatically to operat-

ing mode after approx. 2 s and the adjusted value is saved.

VEGADIF 34 … 51 35

The pressure (e.g. 1 bar) corresponds to the output current 20 mA.

Adjust zero without display

1) Set pressure precisely for zero (e.g. 0 bar) and check via an external pressure calibrator.

2) Push key z+ and z– together.

The pressure (e.g. 0 bar) corresponds to the output current 4 mA.

Setup

Adjust span without display

1) Set pressure precisely for span (e.g. 1 bar) and check via an external pressure calibrator.

2) Push key s+ and s– together.

The pressure (e.g. 1 bar) corresponds to the output current 20 mA.

Adjust zero/span without display however with current meter

For adjustment a control instrument with measuring range 0 ... 20 mA is connected to terminal 1 and tag 1.

1) Set pressure precisely for zero (e.g. 0 bar) and check via an external pressure calibrator.

2) Adjust with keys z+ and z– a current of 4 mA.

The pressure (e.g. 0 bar) corresponds to an output current 4 mA.

3) Set pressure precisely for span (e.g. 1 bar) and check via an external pressure calibrator.

4) Adjust with the keys s+ and s– a current of 20 mA.

Example: Meas. range 0 … 1000 mbar Reference pressure span ps = 1000 mbar, zero pz = 0 mbar, reference pressure p = 250 mA (750 mbar)

250 mbar – 0 mbar

Iz = 4 mA + 16 mA • ––––––––––––––––––––

1000 mbar – 0 mbar

Iz = 8 mA

750 mbar – 0 mbar

Is = 4 mA + 16 mA • –––––––––––––––––––

1000 mbar – 0 mbar

Is = 16 mA

Bias pressure

Bias pressure is the pressure indicated although a differential pressure of 0 mbar is present at the pressure tappings. The bias pressure is caused by unequal hydrostatic pressures 1) on the measuring cell.

The following relation is valid:

Pressure indication = Sensor pressure – Bias pressure

The pressure (e.g. 1 bar) corresponds to an output current 20 mA.

Example: Pressure indication: 0.025 bar Sensor pressure: 0.035 bar Bias pressure: 0.010 bar

Note:

When only intermediate values are available

0.025 bar = 0.035 bar – 0.010 bar

for the reference pressures, the current to be adjusted can also be calculated:

Note:

p – p

I = 4 mA + 16 mA • –––––––––

p = reference pressure ps= pressure at span pz= pressure at zero

ps – p

- The adjustment of the bias pressure must be carried out before the adjustment of zero and end, as these values had been modified.

- The adjustment of the bias pressure does not influence the current output. The signal current and its characteristics are not modified.

This can be caused e.g. by non-level pressure tappings and therefore different needs in the impulse lines, by the installation of the capillary lines or the position of the measuring cell itself (max. 2 mbar when tipped by 90°).

36 VEGADIF 34 … 51

Setup

Indicate bias pressure

1) Push keys z+ and s+ once together.

2) Adjusted bias pressure is indicated.

3) After approx. 2 s the display resets automatically to operating mode.

Save/take over bias pressure

1) Push keys z+ and s+ twice together. The available pressure value is taken over as bias pressure.

2) After approx. 2 s the display resets automatically to operating mode and shows

0.000 bar. Therefore the available pressure (0 bar) was taken over as bias pressure (correction value).

Delete bias pressure

1) Push the keys z– and s– twice together.

2) After approx. 2 s the display resets automatically to operating mode and shows the value of the uncorrected bias pressure.

Lock/unlock keys

Lock

1) Push keys z+ and s– once together.

2) "Prot“ = protected appears (locked).

3) After approx. 2 s the display resets automatically to operating mode.

Unlock

1) Push keys z– and s+ once together.

2) "Free“ = unlocked appears.

3) After approx. 2 s the display resets automatically to operating mode.

Integration time and output characteristics

An integration time of 0, 1, 2, 4, 8, 16 s can be adjusted via the step switch to smooth the output signal of your VEGADIF. The output characteristics for pressure, level and flow can be selected as line or square root.

The integration time is the time required by the output to reach 63 % of the actual change after a step change of the differential pressure. After three times the adjusted integration time, the current output signal will have reached 95 % of the step change.

Explanation:

- an integration time of 0 s means tracking of the current output without additional delay

- an integration time of 16 s means that the output has reached its final value only after more than one minute.

Adjust the integration time and the output characteristics acc. to the table. All figures indicate the switch positions:

Characteristics linear by root

Integration time

0 s 1 9

0.5 s 2 A

1 s 3 B

2 s 4 C

4 s 5 D

8 s 6 E

16 s 7 F

I ~ DpI ~ ÖDp/Dp

max.

The positions 0 and 8 enable the adjustment with PC (VVO) or with HART® handheld by which you can also adjust the integration time of 0 … 40 s.

VEGADIF 34 … 51 37

Setup

4.3 Adjustment with HART® handheld

Beside the adjustment with the 4-key adjustment element in the sensor and the adjustment with the PC and the adjustment software VVO a VEGADIF can be also operated with a HART® handheld. If the inner resistance of the voltage supply is less than 250 W, a resistor of RX = 250 W 1/4 W must be looped into the signal/connection line during adjustment.

The digital adjustment and communication signals would be shortcircuited via too small resistances of the supply current source or the processing system so that the sensor communication would not be assured.

Electronics powered by PLC with active input circuit

PLC

Ri > 250

PLC

250

Ri < 250

38 VEGADIF 34 … 51

Setup

Electronics powered by power supply unit

Ammeter for local testing

analogue / digital indicating instrument

1+2-3

Transmitter terminals

Supply voltage (Ri < 250 W)

4 … 20 mA

Note:

An ammeter for local testing of the output current can be connected between terminal 1 and its tag. This measurement can be made during operation without interrupting the supply line.

Electronics powered by a VEGA-signal conditioning instrument

Ammeter for local testing

Transmitter terminals

1+2-3

4 … 20 mA

0/4 … 20 mA

DISBUS

If the differential pressure transmitters are operated on a VEGA-signal conditioning instrument, you have to connect the sensor via a resistor acc. to the following schedule to the signal conditioning instrument during the HART® adjustment. Together with the inner resistor of the signal conditioning instrument, the resistance value of 250 W required for the HART® instrument is reached.

If the resistor of the processing system or the voltage supply is more than 250 W, there is no "Adjustment resistor“ required.

VEGADIF 34 … 51 39

Setup

PLC

Ri > 250

VEGALOG VEGAMET

VEGA-signal conditioning instr. R

VEGAMET 513, 514, 515, 602 VEGATRENN 544 VEGATOR 521…527 50 … 100 Ohm

VEGAMET 614 no additional VEGADIS 371 resistance

required

VEGAMET 601 200 … 250 Ohm

VEGASEL 643 150 … 200 Ohm

VEGAMET 513 S4, 514 S4 515 S4, VEGALOG EA-card 100 … 150 Ohm

40 VEGADIF 34 … 51

Setup

The most important adjustment steps

On the following two pages you see the HART®-menu plan to differential pressure transmitter VEGADIF. The most important adjustment steps are marked in the menu plan with the figures A … F. Setup the sensor in the sequence A…F.

A: Empty adjustment without medium

(

zero

– dry)

B: Full adjustment without medium

(

span

– dry)

A1: Empty adjustment with medium

(

zero

)

B1: Full adjustment with medium

(

span

)

C: LOW/HIGH SENSOR CAL.

(only if required, see following diagram) Here the proportionality defined by the empty and full adjustment between pressure and signal current (characteristics) can be shifted in the position (vertically). The characteristics can be quasi hold or shifted in the range of the zero point or the range of the measuring range final value (see right diagram), to get a requested signal current in the zero point or at the measurement end.

Adjustment characteristics (e.g. -70 … 80 mbar) after LOW/HIGH SENSOR CAL. was carried out (point C)

LOW SENSOR CAL.

-100

mbar

zero

- 50

D: BIAS PRESSURE AUTOM.

Means that the indication can be set to zero, to suppress a certain pressure in the indication. The output characteristics and the signal current are not concerned.

E: Damping of the signal output.

The pressures on the measuring cell are integrated and averaged in the given times, to get a stable indication and signal current output even in case of quick pressure fluctuations.

F: Selection of the physical unit

HIGH SENSOR CAL.

○ ○ ○ ○ ○ ○

20 19 18 17 16 15 14 13 12 11 10

9 8 7 6 5

Adjustment characteristics (e.g. -70…80 mbar) after empty/full adjustment

50 100

○ ○ ○ ○ ○ ○ ○ ○○○○○○○○○○○○○○○○○○○○○

span

mbar

VEGADIF 34 … 51 41

HART® menu plan VEGADIF

Setup

Switch on:

Hart Communicator

Self T est

in Progress

Firmware Rev: F2.2 Module Rev: 3.6

01992-96 FRSI

after approx. 20 s

Generic: 10956186 Online (Generic)

1 Device setup 2 PV 2.633 mbar 3 PV AO 4.014 mbar 4 PV LRV 0.000 mbar 5 URV 3000.000 mbar

HELP SEND

Setup the sensor in the sequence of the letters A, B, C and D (dry adjustment: adjustment without medium). For the adjustment with medium, setup the sensor in the sequence A1, B1, C and D

Generic: 10956186 Device setup

1 Process variables 2 Diag/Service 3 Basic setup 4 Detailed setup 5 Review

SAVE HOME

Generic: 10956186 PV

2.405 mbar

HELP EXIT

Generic: 10956186 A01

3.987 mA

HELP EXIT

Generic: 10956186 Process variables

1 Snsr 2.684 mbar 2 AI % rnge 0.090 3 AO1 4.014

HELP SAVE HOME

Generic: 10956186

1 PV LRV 0.000 mbar 2 URV 3000.000 mbar

HELP HOME

Generic: 10956186

– WARNING –

Return control loopo to automatic control

Generic: 10956186

– WARNING – Pressing ÒK`will change device output.

Put loop in manual.

ABORT OK

Generic: 10956186

1 PV LRV 0.000 mbar 2 URV 3000.000 mbar

1.1

Important menu windows

Less important menu windows

Dry adjustment:

Empty and full adjustment without medium (with medium see next page)

Generic: 10956186

1 PV LRV 0.000 mbar 2 URV 3000.000 mbar

HELP HOME

Generic: 10956186

1 PV LRV 0.000 mbar 2 URV 3000.000 mbar

HELP HOME

HELP SEND HOME

Generic: 10956186 PV LRV

0.000 mbar

HELP DEL ESC ENTER

Empty adjustment without medium

Generic: 10956186 PV URV

3000.000 mbar

900.300 mbar

HELP DEL ESC ENTER

Full adjustment without medium

continue as under A (figure 4.1 or 5.1)

4.2 (5.2)

4.1 (5.1)

42 VEGADIF 34 … 51

Setup

1.2.2

Simulation:

Output of individual current values for test purposes

1.2.3

A1 B1

Generic: 10956186 Tag

10956776

LEV 34

HELP DEL ESC ENTER

Generic: 10956186 PV Snsr unit mbar

mbar g/Sqcm kg/Sqcm Pa

Generic: 10956186 Range values

1 PV LRV 0.000 mbar 2 URV 3000.000 mbar 3 LSL -3000.000 mbar 4 USL 3000.000 mbar

HELP HOME

Generic: 10956186 Device information

1 Distributor 2 Model 3 Dev id 4Tag 5 Date **/**/**

HELP SA VE HOME

6 Schreibgeschützt 7 Beschreibung 8 Nachricht 9 PV Sens. Seriennr.

Werknummer Revisionsnummer

1.4.1

ESC ENTER

Measured value

Change measuring unit

Info on lower and upper measuring range limit as well as the min. span (also the sensor characteristics values)

1.4.2 Adjustment of the integration time

Adjustment of zero and span

linear

Display of the level in % of the adjusted span

Wet adjustment:

Empty and full adjustment with medium (see next page)

1.3.1 New measurement

loop designation to save with ENTER and SEND

1.3.2

1.3.3

Display of the used

}

measuring range

Display of

}

measuring range

1.3.4

see next page

Generic: 10956186 PV

2.676 mbar

HELP EXIT

Generic: 10956186 PV % rnge

0.086 %

HELP EXIT

Generic: 10956186 AO1

4.014 mA

HELP EXIT

Generic: 10956186 Diag/Service

1 Test device 2 Loop test 3 Calibration 4 D/A trim

HELP SAVE HOME

Generic: 10956186 Basic setup

1Tag 2 PV Unit 3 Range values 4 Device information 5 PV Xfer fnctn

HELP SA VE HOME

6 PV Damping

Generic: 10956186 Dateiled setup

1 Sensors 2 Signal condition 3 Output condition 4 Device information

SAVE HOME

1.1.1

Safety enquiry Acknowledge-

1.1.2

1.1.3

1.2

Correction possibility of the digital/analogue converter in conjunction with a prevision ammeter as reference instrument (only for service purposes).

1.3

1.4

as menu

1.3.4

ment

Transmission function (linear)

Adjustment of the integration time

Generic: 10956186 Sensors

HELP SAVE HOME

Generic: 10956186 Choose analog output level

14 mA 2 20 mA 3 Other 4 End

ENTER

Generic: 10956186 Calibration

HELP SEND HOME

ABORT

1 Apply values 2 Enter values

D C

1 PV 2.601 mbar 2 PV Snsr unit 3 Sensor information

Generic: 10956186 Signal condition

1 Snsr Damp 0.000s 2 URV 3000.000 mbar 3 AI LRV 0.000 mbar 4 Xfer fnctn Linear 5 AI % rnge 0.082 %

HELP SAVE HOME

VEGADIF 34 … 51 43

Continuation HART® menu plan VEGADIF

Wet adjustment

Generic: 10956186 Set the:

Generic: 10956186 Calibration

1 Apply values 2 Enter values

HELP SAVE HOME

1.2.3

Safety enquiry Acknowledge

1 4mA 2 20mA 3 Exit

ABORT ENTER

1.2.3.1

Empty adjustment with medium

Generic: 10956186 Apply new 4ma input

ABORT OK Full adjustment with medium

Generic: 10956186 Apply new 20ma input

ABORT OK

Setup

Generic: 10956186 Analog output

1 AO1 4.014 mA 2 AO Alrm typ Hi 3 Loop test 4 D/A trim 5 Skaled D/A trim

HELP SAVE HOME

Dry adjustment

Generic: 10956186 Enter values

HELP HOME

Generic: 10956186 AO Alrm typ Hi

1.4.3.1 Generic: 10956186

WARNING–Loop should be removed from automatic control

}

1.2.3.2

1 PV LRV 0.000 mbar 2 URV 3000.000 mbar 3 PV USL 4 PV LSL

1.4.3.1.2

EXIT

ABORT OK

Correction possibility of the digital/analogue converter in conjunction with a precision ammeter as reference instrument (only for service purposes)

Empty adjustment without medium (as menu 4.1 or 4.2 on previous page)

Display of the

}

measuring range

Low: In case of failure current output High: In case of failure current output

Generic: 10956186 Choose analog output level

14 mA 2 20 mA 3 Other 4 End

ABORT

ENTER

goes to 22 mA goes to < 3.6 mA

1.4.3.1.3

Full adjustment without medium

Set signal current for test purposes to a certain value.

1.4.3.2

from menu window

1.4. menu point 3 Condition output

Generic: 10956186 Output condition

1 Analog output 2 HART output

SAVE HOME

1.4.3 Generic: 10956186

HART output

1 Poll addr 2 Num req preams 0 3 Burst mode Off 4 Burst option

HELP SAVE HOME

44 VEGADIF 34 … 51

Setup

Generic: 10956186 Current applied Process value: 2.492 mbar

1 Set as 4mA value 2 Read new value 3 Leave as found

ABORT ENTER

Generic: 10956186 Current applied process value: 2.498 mbar

1 Set as 4mA value 2 Read new value 3 Leave as found

ABORT ENTER

Generic: 10956186 PV LRV

2.547 mbar

HELP DEL ESC ENTER

Generic: 10956186 PV LRV

2.547 mbar

HELP DEL ESC ENTER

1.2.3.1.1

1.2.3.1.2

1.2.3.2.1

1.2.3.1.1.1

Generic: 10956186 Set the:

14 mA 2 20 mA 3 Exit

ABORT

ENTER

Generic: 10956186 Set the:

14 mA 2 20 mA 3 Exit

ABORT ENTER

Generic: 10956186 Enter values

HELP SEND HOME

Generic: 10956186 Enter values

HELP SEND HOME

Quit the menu with „3 Quit“

1.2.3.1.2.1 Quit the menu with

„3 Quit“

1 PV LRV 2.547 mbar 2 URV 3002.547 mbar 3 PV USL 4 PV LSL

Continue as in menu 4.1 on previous page

Continue as in menu 4.2 on previous page

Multidrop operation

1.4.3.2

The sensor provides the measured value also digitally in the HART-protocol beside the 4…20 mA signal.

• Poll address zero:

The sensor takes a level dependent 4…20 mA current and delivers the level simultaneously as digital HART-signal.

• Poll address 1…15:

The output signal is only available as digital HART-signal (HART-signal). The 4…20 mA signal is no longer provided, and the sensor current is fixed adjusted to 4 mA.

Generic: 10956186 Burst–mode Off

Off On Not Used None

Unknown Spcl

Generic: 10956186 Burst–option

PV % range/current Process vars/crnt

HELP ESC ENTER

1.4.3.2.3

ESC ENTER

Generic: 10956186 Poll addr

HELP DEL ESC ENTER

Sensor signals measured values only upon request of the master Sensor signals the measured value selected in „Burst Option“ without master enquiry

Choice is not supported

1.4.3.2.4 Selection of the unit for the measured value

provided digitally without master or host enquiry:

- as process variable (e.g. mbar)

- as percentage value or

- as signal current.

VEGADIF 34 … 51 45

4.4 Adjustment with PC

VEGACONNECT 2

Setup

4 … 20 mA

PLC

If the inner resistance of the power supply or the processing system (PLC) is less than 200 W, a resistor of 200 W to 350 W must be switched into the connection cable during adjustment.

The digital adjustment signal would be extremely damped or shortcircuited via too small input resistors so that the digital communication with the PC would no more be ensured.

For connection of the PC to the pressure transmitter, you require the interface converter VEGACONNECT 2.

When you have connected the PC with the adjustment software to your measuring system,

• first switch on the power supply of the pressure transmitter.

Connection of the PC

Insert the VEGACONNECT into the standard connection of the PC and connect the two-wire line of VEGACONNECT to the pressure transmitter or the signal/supply line of the pressure

• switch on the PC and start the adjustment software VVO.

• in the initial screen you choose with the arrow keys or with the mouse the point "Planning“ and click to "OK“.

transmitter.

You are asked for the identification.

Before starting the setup:

Do not be confused by the many figures,

• Enter under name "VEGA“.

• Also enter under password "VEGA“.

adjustment steps and menus on the following pages. Just carry out the setup with the PC step by step and soon you will no more require the following pages.

The adjustment program VEGA Visual Operating (VVO), in the following just called VVO, gets in direct contact with the connected sensor…

46 VEGADIF 34 … 51

Setup

…and shows you after a few seconds if, with which sensor and where a connection exists.

Note:

When connecting the adjustment software (VVO) to a sensor of which data had been already saved, you will get the information if the requested data should be transferred to the sensor or if you want to transfer the sensor data to the database of the VVO (and are therefore overwritten).

In the menu "Modify meas. loop configuration“ you can coordinate to the measurement loop instead of the sensor number first of all a name (e.g. Tank 10) and a measurement loop designation (e.g. cleaning detergent).

• Confirm the adjustment with "OK“ and after saving you are again in the main menu window.

Adjustment

Configuration

• Click in the main menu window to the menu "Configuration/Measurement loop/Modify“. This is the first step for the setup of the sensor.

VEGADIF 34 … 51 47

In the menu "Instrument data/Parameter adjustment“ you now carry out all important sensor adjustments.

• Choose the menu "Instrument data/Parameter adjustment“.

• Confirm the warning with "OK“.

In the heading you see the previously entered measurement loop name and description.

• Now choose in the menu window "Instrument data parameter adjustment“ the menu point "Adjustment“.

• Click in the menu window "Adjustment“ to "zero/span“.

Setup

In the example this is a pressure transmitter with a measuring range of -80 … +80 mbar, by which negative pressures (partly evacuation) are measured. The min. value was adjusted to -80 mbar and the max. value (span) to 80 mbar (i.e. meas. range end).

• Confirm your adjustment with "OK“ and after a short data transmission to the sensor you are again in the menu window "Adjustment“.

• Quit all menu windows with "Quit“ and you are again in the initial menu.

You can carry out the min/max. adjustment with medium or without medium. When you want to carry out the adjustment with medium, you have to carry out the min. adjustment with emptied vessel and the max. adjustment with filled vessel.

If the indication does not show zero at zero pressure after the adjustment of the meas. begin, it can be corrected to zero (position adjustment). Here the proportionality between pressure and signal current (characteristics) defined by the empty and full adjustment can be shifted in the position (vertically). The char-

Offset correction

It is therefore comfortable and quick to carry out the adjustment without medium as shown in the example.

acteristics can be quasi hold and shifted in the range of the zero point. This corresponds e.g. to the menu "LOW SENSOR CALIBRATION“ in the HART® menu.

• Choose in which unit you want to carry out the adjustment.

• Enter the pressures which should correspond in your application to 0 % and 100 % and push "OK“.

48 VEGADIF 34 … 51

Setup

• Choose in the initial menu "Instrument data/ Parameter adjustment“ the point "Additional functions“.

• Click to "Offset correction“.

• When the sensor is unpressurized and in

installation position, confirm the safety enquiry with "OK“.

• Click to "Correct“.

The sensor value is now correctly provided with 0.0 bar. Also compare the diagram under "4.3 Setup with HART® handheld“.

Linearisation

In the menu "Instrument data/Parameter adjustment/Conditioning/Linearisation“ you coordinate a volume to the level. The relation of level and volume is described in so called linearisation curves.

You see the current sensor value and the measuring cell pressure where the last correction was carried out.

VEGADIF 34 … 51 49

• Click to "Instrument data/Parameter adjustment“, then to "Conditioning“ and finally to "Linearisation“.

Setup

First of all a linear relation is displayed (the function is a straight line).

In the field "Transfer measured value“ the actual pressure in percent of the adjusted span is displayed. You have adjusted the span with the min./max. adjustment. In our example this is in the range of 50 … 1000 mbar.

The user programmable curve is generated by index markers consisting of the value pairs "Linearised“ (volume in percent or in the selected unit) and "Percentage value“ (level in percent).

Gauging by liters

You can choose four linearisation curves: linear, cylindrical tank, spherical tank and user programmable curve.

In the characteristics of the example (evacuated vessel) you see four index markers or value pairs. There is always a linear interpola-

tion between the index markers. Under "User programmable curve“ you can enter an own linearisation curve as relation between level in percent or pressure in percent (percentage value) and the volume (lin-

• Click to "Show scaled values“, to have the adjusted meas. unit displayed on the y-axis (bottom left in the menu window).

earised).

Index marker 1 is at 0 % level or pressure

• Therefore choose "User programmable curve“ and then "Edit“.

(percentage value [%]) corresponding to an actual pressure of 0 mbar.

Note!

When you want to enter an own linearisation curve, you have to enter two or more index markers, otherwise the transmitter will fail.

50 VEGADIF 34 … 51

Setup

Index marker 2 is at 30 % level or pressure and 5 % volume.

Index marker 3 is at 70 % level or pressure and 35 % volume.

Index marker 4 is at 100 % level or pressure and 100 % volume (100 liters).

1000 mbar

Vacuum

Saline solution

= 100 liters

700 mbar = 35 liters

300 mbar = 5 liters

Again in the menu window "Conditioning“ you can enter with the menu point "Integration time“ a measured value integration. This is useful for fluctuating product surfaces to compensate a permanently changing measured value indication and output. As a standard feature an integration time of 0 seconds is adjusted.

• Quit the menu with "OK“.

You are again in the menu window "Instrument data parameter adjustment“.

Measurement loop data

• Click in the menu window "Instrument data parameter adjustment“ to "Meas. Loop Data“.

VEGADIF

0 mbar = 0 liters

You can enter max. 32 index markers (value pairs).

• Quit the menu with "OK“.

• Confirm the message with "OK“ and your

individual linearisation curve will be saved in the sensor.

You get all sensor information. With the point "reset“ you delete the pressure and temperature history which is saved in the sensor.

VEGADIF 34 … 51 51

Outputs

• Click in the menu window "Instrument data parameter adjustment“ to "Outputs“ and then in the menu window "Outputs“ to "Current output“.

The menu window "Current output“ opens. Choose here the reaction of the signal current in case of failure (22 mA or no change). With "no change“ the transmitter keeps in case of failure the actual current value and does not go to the failure current of 22 mA.

Conditioning

Setup

The menu window "Conditioning“ opens.

• Click to "Scaling“.

In the menu window "Scaling“ you choose the figure and the physical unit to be displayed (if available) of the transmitter.

• Click to "Instrument data/Parameter adjustment/Conditioning“.

Display of measured value and back-up

See manual "VEGA Visual Operating (VVO)“.

Simulation

In the menu window "Simulation of outputs“ you can simulate the filling of the vessel or the signal current. You therefore set the indication and the signal current to the requested value.

For further information see “Manual VEGA Visual Operating“.

52 VEGADIF 34 … 51

Installation connections

5 T ypical installation

connections

5.1 Valves

For VEGADIF 34 and 35 the use of three or fivefold valve blocks which can be directly flanged to the transmitter are recommended. These offer the following advantages:

- Mounting and dismounting of the transmitter are possible without interrupting the process.

- For the fivefold valve block two valves for vent drain are provided.

Typical valve connections with the threefold valve block

(standard connection)

For impulse lines a block valve each should be provided at the pressure tapping point.

The threefold valve block includes two inlet valves and one equalization valve.

The two inlet valves are used to isolate the measuring cell from the impulse lines.

The equalization valve is used for zero-point adjustment of the transmitter especially in flow and level measurement.

T ypical valve connections for a five valve block

(connection also in liquids)

For each impulse line a block valve should be provided at the pressure tapping point. The five valve block includes two inlet valves and one equalization valve as well as in addition two blow down valves. This connection is also suitable for aggressive liquids.

The two inlet valves are used to isolate the measuring cell against the impulse lines.

The equalization valve is used for zero-point adjustment of the transmitter especially in the flow and level measurement.

Two additional valves are used for drain-off in the impulse lines.

For draining observe the following procedure: 1 Close inlet valves 2 Open blow down valves

In this way the impulse lines are cleaned throughout.

from the pressure tappings

Block valves

Three valve block

Inlet valves

to the transmitter

VEGADIF 34 … 51 53

Equalization valve

from the pressure tappings

to the transmitter

to outlet

Block valves

Five valve block

Inlet valves

Blow down valves

Equalization valve

Installation connections

5.2 Impulse lines

The impulse lines are used for pressure transmission from the pressure tappings to the transmitter. The following regulations must be observed for running the impulse lines so that the measured pressure reaches the sensor unaltered:

- Lines with 12 x 1.5 mm or more should be used (see e.g. DIN 19 210, impulse lines for flow measuring systems).

- The line material must be corrosion resistant, suitable for the measured product.

- The impulse lines must be as short as possible and must be earthed; avoid bending.

- The impulse lines must have a gradient of at least 10 % (10 cm per meter); preventing buildup.

- Ensure that the whole measurement system (transmitter, high and low side impulse lines etc.) is installed in the same aggregate condition, even temperature conditions.

- Both impulse lines should be at the same temperature (differential pressure measurement depends on the density); hence the impulse lines must be routed close together; if necessary isolate or couple thermally.

- If necessary the impulse lines should be fastened with pipe clamps.

- It is recommended to connect the impulse lines via multiple valve blocks to the transmitter; this ensures simple mounting and dismounting of the transmitter without interruption of the process.

Connection of the impulse lines

The impulse lines must be cleaned before connecting to the transmitter:

- In applications with gases blow through with compressed air.

- In applications with liquids use a suitable cleaning liquid.

Contamination such as e.g. welding or pickling residues must not penetrate the process flanges (causing errors).

Before connecting the transmitter, the impulse lines to the block valves or valve block must be tested for leaks.

The impulse line with the higher pressure must be connected to the plus side of the transmitter, the impulse line with the lower pressure to the minus side of the transmitter.

Connection of impulse lines direct to the transmitter

In this case the following connection options exist:

- with cutting ring threading (non-soldered taper-bush) to the 1/4“ NPT, 1/2“ NPT or RC 1/4“ NPT female threads of the process connection to the transmitter.

- with separate oval flange adapter to the

/2“-female thread.

Connection of impulse lines to the valve block

The impulse lines are connected with cutting ring threading (non-soldered taper-bush) to the 1/4 - 18 NPT female thread of the valve block.

54 VEGADIF 34 … 51

Installation connections

Connection of the transmitter to the valve block

The connection of the transmitter is normally made just before commissioning. Generally seal rings made of PTFE as well as four screws are supplied with the valve block. The seal is made on both process connections of VEGADIF.

Procedure: 1 Push both seal rings into the grooves of the

valve block (it is always recommended that two new PTFE-seals are used for any new transmitter installation).

2 Locate the transmitter with the four screws

carefully to the valve block.

3 Tighten the screws crosswise (recom-

mended torque 6 - 8 Nm).

5.3 Differential pressure measurement

Installation connection for liquids

If the pressure of a flowing material is to be measured in a pipe, the pressure tappings must be located where there is steady flow. The impulse lines must be installed with continuous gradient ³ 1 : 10 (i.e. 10 cm per me- ter).

The recommended installation position of the transmitter is below the pressure tappings.

For products with solids content the pressure tappings must be taken from above the pipe.

1 Inlet valves 2 Transmitter 3 Vent or drain valves 4 Block valves 5 Pressure tapping 6 Ventilation screw

For differential pressure measurements referred to atmosphere, the impulse line must be connected to the plus side of the transmitter. The minus side remains open to atmosphere. In case of extremely dirty atmospheres it is recommended to use a filter at the minus side or an open tube bent down. This protects the minus side from blockage.

VEGADIF 34 … 51 55

Installation connections

For this connection the height difference "h“ between tapping point and measuring cell centre must be considered for adjustment of zero and span (the liquid column acts only on the plus side of the measuring cell).

–

1 Inlet valves 2 Transmitter 3 Vent or drain valves 4 Block valves 5 Pressure tapping 6 Vent screw

If the transmitter is mounted above the pressure tapping the vent or drain valves on the process flanges should be rotated. The impulse line gets an additional vent valve.

Installation connection for gases

For the measurement of gases the transmitter should preferably be positioned above the pressure tapping. The impulse line must be connected to the plus side of the transmitter. The minus side remains open to atmosphere. In very dirty atmosphere the use of a filter on the minus side or an open tube bent down are recommended. This protects the minus side against blockage.

The impulse line must be run with continuous incline so that condensation can drain automatically. If a gas contains impurities, special pressure tapping sockets must be used.

2 +

1 Inlet valves 2 Transmitter 3 Vent and drain valves 4 Block valves 5 Pressure tapping 6 Vent screw

If due to constructional reasons mounting of the transmitter below the pressure tapping is required, a separator for impurities as well as

1 Inlet valve 2 Transmitter 3 Vent or drain valves 4 Block valves 5 Pressure tapping 6 Vent screw 7 Vent valve (impulse line)

56 VEGADIF 34 … 51

a blow down valve must be installed in the lowest position of the impulse line.

Installation connections

2 +

1 Inlet valves 2 Transmitter 3 Vent and drain valves 4 Block valves 5 Pressure tapping 6 Vent screw 7 Separator for impurities 8 Blow down valves

7 8

Note

The described connections are recommended installations. For other installation connections different VDE-/VDI-regulations or DIN-standards (e.g. VDE/VDI 3512) give additional installation instructions.

Special instructions for VEGADIF 51

5.4 Level measurement

Installation connection for open vessels

For an open vessel the level is measured from the hydrostatic pressure. "Open vessel" means all vessels where there is an atmospheric pressure above the liquid.

VEGADIF takes the hydrostatic pressure on the plus side via a flange diaphragm, via an impulse line or an isolating diaphragm. The atmospheric pressure is taken via the minus side.

The hydrostatic pressure corresponds to the level measured from the centre of the impulse line multiplied by the specific gravity of the product and the acceleration due to gravity. As the atmospheric pressure acts on the plus side as well as on the minus side of VEGADIF, it is compensated with the differential pressure generation.

Dp = p

Dp, p r: Density [kg/m3]

g: Acceleration due to gravity [m/sec2) h: Level [m]

= r • g • h

hydr

: hydrostatic pressure [Pa]

hydr

For mounting to horizontal pipelines buildup on the isolating diaphragm by sticky products should be avoided. Therefore it is recommended to install the flange connection on top of the pipeline.

VEGADIF 34 … 51 57

Installation connections

VEGADIF 34, 35

The transmitter should be preferably installed at the height of the planned pressure tapping. If a location below the pressure tapping is made, the height difference "h“ for adjustment of zero and span must be included (the liquid column in the impulse line is seen as additional level.

max.

min.

1 Differential pressure transmitter 2 Vent or drain valves 3 Block valve

If in special cases a location above the pressure tapping is necessary, only the liquid, above the centre of the measuring cell is measured.

VEGADIF 44, 45

The transmitter must be mounted on the vessel such that the isolating diaphragm is completely covered by the fill fluid even at min. level.

If a transmitter location below the min. level is selected, the height difference must be included with the adjustment of zero and span (the liquid column in the pressure line influences the output). In case of very dirty atmosphere the use of a filter on the minus side is recommended. This protects the minus side against blockage.

Example VEGADIF 44: Transmitter directly flanged

h = h1 – h

h = ––––––

r • g

With this connection, gas pockets can influence the output. Impulse line and measuring cell must therefore be vented regularly.

Example VEGADIF 45: Transmitter flanged via maintenance valve

In both cases the minus side remains open to atmosphere. In case of very dirty atmospheres the use of filters on the minus side or an open tube bent down is recommended. This avoids blockages on the minus side.

58 VEGADIF 34 … 51

h = h1 – h

1 Transmitter 2 Block valve 3 Emptying valve

h = ––––––

r • g

Installation connections

This installation has the advantage that zero and span can be checked/modified without emptying the vessel. Valve 3 enables the necessary venting/emptying of the mounting socket.

Installation for closed vessels

In a closed vessel with static pressure, the level of a fill fluid is determined via the measurement of the hydrostatic pressure. On the bottom of the vessel, the sum of hydrostatic pressure and static pressure acts as total pressure. The hydrostatic pressure is therefore the difference between the total pressure and the static pressure.

The hydrostatic pressure corresponds to the level of the measured product measured from the centre of the flange isolating diaphragm, multiplied by the specific gravity of the products (as the static pressure acts on the plus side as well as on the minus side of the transmitter, it is compensated with the differential pressure generation).

Dp = r • g • h

Dp: hydrostatic pressure [N/m2] r : density of the fill fluid [kg/m3]

g: acceleration due to gravity [m/sec2] h: level [m]

VEGADIF 34, 35

Standard installation connection

The transmitter should be preferably installed at the height of the planned pressure tapping. If installation below the lower pressure tapping is planned, the height difference "h“ caused in the measuring cell centre must be included in the adjustment of zero and span.

max.

1 Inlet valves 2 Equalization valves 3 Transmitter 4 Vent and drain valves 5 Blow-down valves 6 Separator for impurities 7 Block valves

min.

With this installation a blow down valve and a separator for impurities is recommended for the impulse line. This measure is not necessary when the product is pure and no dirt or sludge is expected in the pipes.

Note:

- Unlike single input pressure transmitters the

choice of the differential pressure transmitter is only made according to the expected pressure difference. The static pressure need to be considered provided the permissible nominal pressure is not exceeded. Hence the selected measuring range can be adapted to the expected pressure difference.

- The described connections are recom-

mended installation connections. For other installation arrangements different VDE/VDIregulations or DIN-standard (e.g.. VDE/VDI

3512) give further installation instructions.

VEGADIF 34 … 51 59

Installation connections

Installation connections for closed vessels with steam pressure

In a closed vessel with static steam pressure the sum of the steam pressure and the hydrostatic pressure acts on the bottom of the vessel as total pressure. This total pressure is fed to the plus side of the transmitter. In a separate vessel a fixed level is generated by condensate. This condensate column transmits the steam pressure to the minus side of the transmitter and protects the measuring cell from hot steam.

The following must be noted:

- The impulse line from the condensate pot to the vessel must be run with a slight gradient to the vessel, so that excess condensate returns to the vessel and the level in the condensate pot remains constant.

- Block valve "7“ between vessel and condensate pot must not impede the steam outlet to the condensate pot; the installation must prevent water pockets occurring in the valve.

- With insufficient condensate in the condensate pot additional condensate must be added via the dosing valve "9“.

- If the medium has a density other than the condensate column (1.0 g/cm3), this must be included for adjustment of span.

For this installation a blow down valve and a separator for impurities is recommended for each impulse line. This measure is not necessary when the product is pure and no dirt or sludge is expected in the pipeline.

1 Inlet valves 2 Equalization valve 3 Transmitter 4 Vent or drain valves 5 Blow down valves 6 Separator for impurities 7 Block valves 8 Adjustment pot 9 Dosing valve

The differential pressure is detected as follows by the transmitter:

DP = pF + pD – (pk + pD)

DP = pF – p

DP: Differential pressure

pF: Hydrostatic pressure of the liquid column pD: Static pressure of the steam pk: Hydrostatic pressure of the condensate column

(constant)

The zero is determined as a negative differential pressure pF – pk.

60 VEGADIF 34 … 51

Installation connections

;

Installation connections for closed vessels with static steam pressure and heated comparative column

This installation is a version of that previously described. However the condensate column is covered by a tube with larger nominal diameter which is filled with the measured product as a communicating pipe. Due to temperature equalisation there is the same density for both columns. The outer pipe must be therefore isolated - however not the adjustment pot (the condensate heat must be dissipated).

The installation is preferred for measuring substances with higher density as more precise output is obtained.

For this installation the same previously described technical conditions are valid.

The VDE/VDI-regulation 3512 or different DINstandards give more detailed information:

- Piping and connection of throttles and impulse lines.

- Choice of components for aggressive products.

VEGADIF 44, 45

The transmitter must be mounted to the vessel such that the isolating diaphragm is even at min. level completely covered by the fill fluid.

The nozzle for the total pressure can be at the bottom of the vessel or at a defined height. The pressure tapping for the static pressure must be above the max. level. The nozzle is connected to the plus side, the top to the minus side of the transmitter.

The transmitter takes the total pressure on the plus side via the flange isolating diaphragm, the static pressure on the minus side via the impulse line and the process connection.

Standard connection

Example VEGADIF 45: Transmitter directly flanged

;

;;;;;;;;;;

1 Inlet valves 2 Equalization valves 3 Transmitter 4 Vent or drain valves 5 Block valves 6 Blow down valves 7 Separator for impurities

VEGADIF 34 … 51 61

1 Transmitter 2 Block valve 3 Separator for impurities 4 Blow down valve 5 Vent or drain valve

h = ––––––

r • g

Installation connections

Example VEGADIF 45: Transmitter flanged via maintenance valve

1 Transmitter 2 Block valve 3 Separator for impurities 4 Blow down valve 5 Emptying valve

h = ––––––

r • g

This connection has the advantage that zero and span can be checked (modified) without emptying the vessel. The valves 5 and 6 enable the necessary venting/emptying of the socket.

Installation connections for closed vessels with static steam pressure

In a closed vessel with steam pressure the product level is determined via the measurement of the hydrostatic pressure. The sum of steam pressure and hydrostatic pressure acts as total pressure on the bottom of the vessel. The hydrostatic pressure is therefore the difference between total pressure and static steam pressure.

The following must be noted:

- The impulse line from the adjustment pot to the vessel must be run with a slight gradient to the vessel; excess condensate returns to the vessel, the level in the adjustment pot remains constant.

- Block valve "2" between vessel and adjustment pot must not impede the steam line to the adjustment pot; the installation must be

such that no water pocket is created in the valve.

- With insufficient condensate in the adjustment pot, liquid must be added constantly in small quantities as additional condensate via dosing valve "6".

- If the reference liquid has a different density to the condensate column (1.0 g/cm3), adjustment of span has to be checked.

For this installation connection a blow down valve and a separator for impurities is recommended. This measure is not necessary when the product is pure and no sludge is expected in the pipes.

Note:

For this installation connection a measuring cell must be used allowing a reduction of the zero point up to -100 % of the measuring range.

Example VEGADIF 45: Transmitter directly flanged

The transmitter feels the total pressure on the plus side via the isolating diaphragm, the static pressure on the minus side via the im-

pulse line. In a separate adjustment pot a fixed level is generated by condensation. This condensate column transmits the steam pressure to the minus side of the transmitter and protects the measuring cell against hot steam.

62 VEGADIF 34 … 51

1 Transmitter 2 Block valve 3 Adjustment pot 4 Separator for impurities 5 Blow down valve 6 Dosing valve 7 Vent or drain valve

h = ––––––

r • g

Installation connections

The differential pressure is determined by the transmitter as follows:

DP = pF + pD – (pk + pD)

DP = pF – p

DP: Differential pressure

pF: Hydrostatic pressure of the liquid column pD: Static pressure of the steam pk: Hydrostatic pressure of the condensate column

(constant)

The zero is determined from pF – pk.

Installation connections for closed vessels with steam pressure and heated reference leg

This installation connection is as previously described. However the condensate column is covered by a pipe with larger nominal diameter which is filled with the measured product in a communicating pipe. Due to temperature equalization there is the same density for both columns.

The outer pipe must be insulated but not the adjustment pot (the condensate heat must be dissipated).

This installation connection is preferred for measuring substances with higher density, to produce precise outputs.

For this installation connection the same technical conditions are valid as above.

Example VEGADIF 45: Transmitter directly flanged

1 Transmitter 2 Block valve 3 Adjustment pot 4 Dosing valve 5 Vent or drain valve

h = ––––––

r • g

VEGADIF 51

Installation connection for closed vessels with static pressure

In a closed vessel with static pressure, the level of a product is determined via the measurement of the hydrostatic pressure. The sum of the hydrostatic pressure and the static pressure acts as total pressure on the bottom. The hydrostatic pressure is therefore the difference between total pressure and static pressure.

The transmitter feels on the plus side the total pressure via the isolating diaphragm and on the minus side the static pressure.

The isolating diaphragm must be mounted such on the vessel that the isolating diaphragm is completely covered by the product even at min. level.

The transmitter can be mounted as shown or via a maintenance valve.

VEGADIF 34 … 51 63

The hydrostatic pressure corresponds to the level of the product measured from the centre of the flange isolating diaphragm, multiplied with the specific gravity of the product (as the static pressure acts on the plus side as well as at the minus side of the transmitter, it is compensated by the differential pressure generation).

Dp = r • g • h

Dp: Hydrostatic pressure [N/m2] r : Density of the fill fluid [kg/m3]

g: Acceleration due to gravity [m/sec2] h: Level [m]

Installation connections

h = ––––––

e • g

Note:

- When installation of the transmitter below the min. level is selected, the resulting height difference for the adjustment of zero and span must be noted (the liquid column in the capillary line influences the output).

- Unlike gauge pressure transmitters the choice of the differential pressure transmitter is only made according to the expected pressure difference. The static pressure within limits needs not to be considered.

h = ––––––

r • g

This mounting location is only permissible if no vacuum occurs.

This mounting location is recommended in where vacuum might occur.

64 VEGADIF 34 … 51

Installation connections

5.5 Flow measurement

Function

The differential pressure method is based on the fact that the energy components are constant. The total energy consists of a dynamic element (due to the flow rate) and a static element (due to the pressure). A restriction within the line causes an increase of the flow rate and a reduction of the pressure. This pressure difference relates to the flow via the following relations:

q = c • Ö D

q: Flow c: A constant, depending on installation conditions

DP: Measured differential pressure

Installation connection for liquids

For measurement of liquids the impulse lines must be completely filled with liquid. Gas in the impulse line or in the measuring cell causes measuring errors. Mounting the transmitter below the pressure tappings, the impulse lines can degas automatically.

Hence the recommended installation position of the transmitter is below the pressure tappings.

1 Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Pipeline

1 2

The transmitter can also be installed above the pressure tappings. With this connection air or gas pockets can be generated in the highest part of the measurement point which influence the measurement. Therefore a vent is necessary. This arrangement should only be selected with sufficient static pressure. The advantage is than in case of expected buildup: measuring cell and impulse lines clean automatically.

VEGADIF 34 … 51 65

Installation connections

1 Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Pipeline

Installation connection for gases

For the flow measurement of gases the impulse lines may be dry. The recommended installation position of the transmitter is above the pressure tappings.

1 Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line

2 1

With an installation for flow measurement of vapours the transmitter may be installed below the pressure tappings, the break points of the impulse lines from the tappings have to be noted. They must have exactly the same height, to avoid pressure influence by condensate columns of different height.

1 Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line

1 2

66 VEGADIF 34 … 51

Installation connections

Instructions for both connections

- For steam flow measurements blow down lines should be installed. The line to the blow down valve should possibly be straight.

- The pressure lines dissipate condensate heat. Hence they should not be insulated.

- VDE/VDI-regulation 3512 or different DINstandards give further additional information.

Installation connection for gases

Humid gases at ambient temperatures contain a certain quantity of condensing particles. The recommended installation of the transmitter is hence above the tapping points so that condensate can return to the process. This connection prevents unequal condensate buildup at the transmitter and therefore measuring errors. The pressure lines must be run with sufficient gradient.

1 Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line 8 Cooling chambers

1 2

With dry gases, installation of the transmitter above as well as below the pressure tappings is possible. Also in this case the impulse lines must be run with sufficient gradient so that condensate can flow to the drain valves.

1 Inlet valve 2 Equalization valve 3 Transmitter 4 Vent or drain valve 5 Blow down valve (if needed) 6 Block valve 7 Process line 8 Cooling chambers

2 1

Instructions for aggressive gases

If the measuring cell needs protection from clean but aggressive gases, an installation with protective pots according to VDE/VDI 3512 should be selected. Alternatively the method of the protective gas washing can be used which is also applicable for dirty aggressive gases.

VEGADIF 34 … 51 67

6 Diagnostics

Diagnostics

Maintenance

VEGADIF 34 … 51 differential pressure trans- mitters are maintenance free. Just the wetted parts are subjected to a certain wear. Therefore check regularly the condition of the parts, especially of the diaphragms and process seals. Note the service instructions VEGADIF 34 … 51 differential pressure transmitters.

Repair

If the measures for failure rectification are not successful, return the concerned instrument for repair to VEGA. Please note the following:

• Attach information: application, medium, failure description.

• Remove buildup, especially of substances hazardous to health.

Failure rectification

Due to the selfmonitoring VEGADIF differential pressure transmitters offer a high degree of reliability. Within the selfmonitoring, the signal circuit 4 … 20 mA is additionally used for transmission of failure information. If a failure is detected, the output current takes a value of

21.5 mA. Before removing the VEGADIF to

check failures, the following should be checked:

- atmospheric pressure compensation (for level measurements on open vessels)

- electrical components and connections

Checking the electrical components

VEGADIF terminals

1+2-3

Voltage

Current

V mA

External energy source

Instruction for Ex-applications

Deviating from the above, terminal 1 and tag 1 are used only for shortterm connection to a certified, active floating (max. value: 470 mW) or an individual, passive floating measuring instrument. For connection the regulations for switching of intrinsically safe circuits (measuring instrument, supply and signal circuit) have to be noted.

External overvoltage arresters

(if available)

- check on interruption and shortcircuit.

Voltage

- the terminal voltage on the differential pressure transmitter must be at least

11.5 V DC.

- the supply voltage for the differential pressure transmitter e.g. by a VEGAMET signal conditioning instrument should be approx. 25 V DC.

Current

Current value Condition

3.8 … 20.6 mA standard range of the output

21.5 mA fault signal

0 mA signal line interrupted

< 3.6 mA electronics or pressure sensor

> 21.6 mA shortcircuit in the signal line,

68 VEGADIF 34 … 51

current

element defective

electronics or pressure sensor element defective

Diagnostics

6.1 Failure codes

In case of failures, VEGADIF provides failure codes. The bar graph provides the last valid measured values as a flashing figure in the display module.

If several failures occur at the same time, the sequence of the indication depends on the priority of the failures.

Code Type Reason and rectification

E101 Failure Electrical instrument failure

E102 Warning Electronic instrument failure with the pointer display

E103 Failure Initialisation is running

E104 Warning Sensor adjustment, calibration error, adjustment points too close together

E106 Failure Upload/Download active

E110 Failure Check sum error

E111 Failure No connection to the sensor-EEPROM (when switching on)

E112 Failure No connection to the sensor ADC (only ceramic sensors)

E113 Failure Measuring error during pressure and temperature measurement

E114 Failure Measuring error during temperature measurement, temperature sensor defective

E115 Failure Sensor gauge pressure P+

E116 Failure Download error

E120 Failure Sensor low pressure

E602 Warning Not monotonously raising or falling vessel characteristics

E604 Warning Vessel characteristics consists of less than 2 index markers

E605 Failure Manual linearisation curve incomplete

E610 Failure Adjustment error, same pressure value for Low and High

E620 Warning Signal current/measured value not within the permitted range < 3.8 mA or > 20.5 mA

- EEPROM check sum error

- carry out a reset (Code 7864), re-adjust the instruments

- wait until the procedure is finished

- new adjustment of the sensor

- wait until the procedure is finished

- carry out a reset (Code 5140), error remains

- removal by service

- remains until gauge pressure disappears

- restart download

- remains until low pressure disappears

- check the plausibility of the manually entered characteristics. Volume increases with the level?

- check the manually entered characteristics

. Enter the linearisation curve in mode „Level linear“ and then choose

the mode „Characteristics“.

- check the adjustment

VEGADIF 34 … 51 69

7 Instrument modification

Mounting of the LC-display

VEGADIF 34 … 51 differential pressure trans- mitters can be equipped with a LC-display. Make sure that the measuring range on the display, e.g. 0 … 1000 mbar, corresponds to the sensor data.

• During mounting penetration of humidity and aggressive products in the electronics box should be avoided.

• A special housing cover with window is supplied with the instrument. This covers the electronics box with integral LC-display.

Instrument modification

Fig. 6.1 Mounting of the LC-display

Mounting procedure

1 Unscrew the housing cover of the electron-

ics box.

2 Remove blind coupling on the electronics

board in the transmitter. Plug the four-pole coupling of the LC-display to the socket of the electronics board until snap in. Note: The blind coupling should be kept, if the LCdisplay should be removed.

3 Insert the LC-display in the requested 90°

position into the holder until snap in.

4 Cover the electronics box with the housing

cover for the display.

70 VEGADIF 34 … 51

Notes

VEGADIF 34 … 51 71

VEGA Grieshaber KG Am Hohenstein 113 D-77761 Schiltach Phone (0 78 36) 50 - 0 Fax (0 78 36) 50 - 201 e-mail info@vega-g.de

ISO 9001

The statements on types, application, use and operating conditions of the sensors and processing systems correspond to the latest information at the time of printing.

Technical data subject to alterations

2.20 095 / Oct. ‘99

Vega Vegadif 44, Vegadif 51, Vegadif 35, Vegadif 34, Vegadif 45 Operating Instructions

Specifications and Main Features

Frequently Asked Questions

User Manual

Safety information

Note Ex-area

1 Product description

1.1 Function and configuration

1.2 T ypes and versions

1.3 T ype plate

1.4 T echnical data

1.5 Dimensions

1.6 Approvals

2 Mounting

2.1 Verifying operating conditions

2.2 Pre-installation

2.3 Mounting

3 Electrical connection

3.1 Connection instructions

3.2 Load resistance

3.3 Connections

3.4 Ex-applications

4 Setup

4.1 Adjustment structure

4.2 Adjustment with 4-key adjustment element

4.3 Adjustment with HART® handheld

5.1 Valves

5.2 Impulse lines

5.3 Differential pressure measurement

5.4 Level measurement

5.5 Flow measurement

6 Diagnostics

6.1 Failure codes

7 Instrument modification