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

Level and Pressure

Operating Instructions

VEGADIF 34 … 51

p

Contents

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
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.

Note Ex-area

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

VEGADIF 34 … 51

3

Product description

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

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.

4	VEGADIF 34 … 51

Product description

1.2 Types 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 34

VEGADIF 35

Measuring cell:

silicium-piezoresistive with metal separating diaphragms

Process connection: acc. to DIN 19 213

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 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 35

VEGADIF 44

VEGADIF 34 … 51

5

Product description

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 45

VEGADIF 51

Measuring cell:

silicium-piezoresistive with metal separating diaphragms

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

VEGADIF 51

6	VEGADIF 34 … 51

Product description

1.3 Type plate

Product coding example

Check before mounting and electrical connec-		type DIF35AC4E1VH3C
tion that you are using a suitable differential
pressure transmitter. Observe type and cali-
bration plate which are located as follows:
Calibration plate	Type plate

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

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

Configuration of the type plate (example)

	VEGA VEGADIF		Made in
1			Germany
	Order Code	DIF35 AC4E1 VH 3C
2	Ser.-No. 10612892
	p -160 … 160 mbar
	Pmax 140 bar
	4…20mA	U	11,5 … 45 V DC

Mat. 1.4571 PTFE

1Basic data of the order no.

2Serial number

VEGADIF 34 … 51

7

			Product description
1.4 Technical data
Mechanical data
Materials, wetted parts
VEGADIF 34
-	Diaphragm		Aluminiumoxideceramic (Al2O3)
-	Process seal		FPM, Hastelloy C4 PTFE-plated, EPDM,
			FPM for oxygen application, Kalrez
-	Process connection		carbon steel C22.8 chromized 1.0460,
			stainless steel 1.4571 or 1.4404, Hastelloy C276
			2.4819, PVDF (PN 10)
-	Ventilation valves		stainless steel 1.4571 or 1.4404, Hastelloy C276
			2.4819 (only with process connection Hastelloy)
VEGADIF 35
-	Separating diaphragms		stainless steel 1.4401
-	Process seal		FPM, NBR, PTFE, FPM for oxygen
			applications
-	Process connection		carbon steel C22.8 chromized 1.0460
			stainless steel 1.4571 or 1.4404, Hastelloy C276
			2.4819
-	Ventilation valves		stainless steel 1.4571 or 1.4404, Hastelloy C276
			2.4819 (only with process connection Hastelloy)
VEGADIF 44
-	Diaphragm		Aluminiumoxideceramic (Al2O3)
-	Process seal		FPM, Hastelloy C-4 PTFE-plated, EPDM,
			FPM for oxygen application, Kalrez
-	Process connection (plus side)		carbon steel C22.8 chromized 1.0460,
			stainless steel 1.4571, stainless steel 1.4571
			PTFE coated
			Hastelloy C276 2.4819
-	Process connection (minus side)		carbon steel C22.8 chromized 1.0460,
			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,
			stainless steel 1.4571 or 1.4404, Hastelloy C276
			2.4819
VEGADIF 51
-	Isolating diaphragm		stainless steel 1.4435
-	Process connection		carbon steel C22.8 chromized 1.0460,
			stainless steel 1.4571 or 1.4404, Hastelloy C276
			2.4819

8	VEGADIF 34 … 51

Product description

Materials, non-wetted parts

Common components
-	Electronics housing and cover	Al-casting (Cu-free), protective coating 1)
		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 2)
VEGADIF 35
- Measuring cell housing	stainless steel 1.4571
- Fill fluid of the measuring cell	silicone oil, Fluorlube 2)
VEGADIF 44
- Fill fluid of the measuring cell	silicone oil, mineral oil, Voltalef 1 A 2)
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 2)
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"

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

2)for applications in pure gases

VEGADIF 34 … 51

9

		Product description
Electrical data
Connection
Cable entry		Pg 13.5 (for cable-ø 9 … 12 mm) 1)
Screw terminals		for conductor cross-sections up to 2.5 mm2
Earth terminal		for conductor cross-sections up to 4 mm2

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 2)		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
in Ohm	1000
R total	500
Load
	0
	11,5	20	28,5	37	45

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

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

2)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 1)
100 mbar	-100 mbar	100 mbar	5 mbar	100 mbar	16 bar 2)	25 bar 2)	silicone oil 1)
500 mbar	-500 mbar	500 mbar	25 mbar	500 mbar	100 bar 2)	140 bar 2)	mineral oil 1)
3000 mbar	-3000 mbar	3000 mbar	150 mbar	3000 mbar	100 bar 2)	140 bar 2)	mineral oil 1)

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 mbar3)	-10 mbar	10 mbar	2 mbar	10 mbar	140 bar	140 bar	silicone oil 1)
40 mbar3)	-40 mbar	40 mbar	5 mbar	40 mbar	140 bar	140 bar	silicone oil 1)
160 mbar	-160 mbar	160 mbar	10 mbar	160 mbar	140 bar	140 bar	silicone oil 1)
1000 mbar	-1000 mbar	1000 mbar	50 mbar	1000 mbar	420 bar 4)	420 bar 4)	silicone oil 1)
6000 mbar	-6000 mbar	6000 mbar	300 mbar	6000 mbar	420 bar 4)	420 bar 4)	silicone oil 1)
40000 mbar3)	-40000 mbar	40000 mbar	2000 mbar	40000 mbar	100 bar	420 bar 4)	silicone oil 1)

Minimum pressure

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

1)in applications with pure gases Voltalef 1 A

2)10 bar with process connection PVDF for VEGADIF 34; 40 bar with process flange for VEGADIF 44

3)only VEGADIF 35

4)note nominal pressure of the flanges

VEGADIF 34 … 51

11

		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 1)

Feature	Accuracy 2)	Hysteresis	Repeatability
Instrument

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

better than 0.05 % better than 0.1 % better than 0.05 % better than 0.1 % better than 0.1 %

better than 0.05 % better than 0.1 % better than 0.05 % better than 0.1 % better than 0.1 %

Long-term stability of the zero signal 3)	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)

1)Similar to DIN 16 086

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

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

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

5)relating to the nominal measuring range

6)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 1) 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			23/	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
	material selection of wetted parts acc. to
	order code

1)standard values relating to isolating liquid silicone oil

2)both capillary lines are supplied with the same length

VEGADIF 34 … 51

13

					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 pabs ³ 900 mbar)		-40°C … +85°C
	EPDM		-40°C … +85°C
	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 pabs ³ 1 mbar		-40°C … +85°C
	FPM (Viton for oxygen, oil and grease free)		-10°C … +85°C
-	Plus side VEGADIF 45 and VEGADIF 51		pabs ³ 1 bar	/ 0.05 bar £ pabs1) < 1 bar
	Isolating liquid:
	- silicone oil		-40°C … +200°C	/	-40°C … +180°C
	- 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				Cint = 11.2 nF
Inner effective inductance				Lint = 0.2 mH
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
1) at p		abs	< 1 bar (vacuum range) the isolating liquid boils already at lower temperatures
14				VEGADIF 34 … 51

Product description
1.5 Dimensions
VEGADIF 34
x	81
104	104	View x
		39

80

150 136

y

255

M10	View y
7/16 - 20 UNF
	Mounting loop
41,3	(optional)
1/ " - 18 NPT	S
4
	Z
54	96
82

	M10
255	7/16 - 20 UNF	PVDF
	41,3

1/4" - 18 NPT

54	96
82

with PVDF-flange

VEGADIF 35

235	(93)85	M10 (M12)
		41,3		- 20 UNF
		7/	16
		1/ " - 18 NPT
			4
		54		106 (110)
		85
		100 (135)

The values in brackets relate to PN 420

mbar 500-0	5 2
	0

VEGADIF 34 … 51

15

Product description

VEGADIF 44

DIN-flange DN 80/DN 100

ANSI-flange 3"

M10

7/16 - 20 UNF

1/ " - 18 NPT

4

M10

7/16 - 20 UNF

1/ " - 18 NPT

4

VEGADIF 45

M10

7/16 - 20 UNF

1/4" - 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

d2

dM	L
d4	R
	d5

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.	d2	d4	dM	RL	d5	dM	height 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.

d2

d4

dM

RL

d5

dM

height

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

3/

4

/

43/

/

4

3/

/

35/

/

13/

/

––

––

––

14.2/

4

4

8

4

19.5

120.7

20

92

46

360

R

3

/ 150

8.25/

15/

/

6/

4

3/

/

5 /

23/

/

––

––

––

14.2/

16

4

4

191

24

152.4

20

127

70

360

S

3

/ 150

8.25/

15/

/

6/

4

3/

/

5/

––

2/

3/

23/

/

14.2/

16

4

4

191

24

152.4

20

127

50.8

76.5

70

360

T

3

/ 150

8.25/

15/

/

6/

4

3/

/

5/

––

4/

3/

23/

/

14.2/

16

4

4

191

24

152.4

20

127

101.6

76.5

70

360

U

3

/ 150

8.25/

15/

/

6/

4

3/

/

5/

––

8/

3/

23/

/

14.2/

16

4

4

191

24

152.4

20

127

203.2

76.5

70

360

W

4

/ 300

10/

11/

2

/

78/

/

8

14/

16

/

62/

/

23/

/

––

––

––

14.2/

9

9

4

254

32

200.1

23

158

70

360

VEGADIF 34 … 51

17

Product description

VEGADIF 51

7/16 - 20 UNF

1/4" -

18 NPT

Isolating diaphragm as cell version, AA … CR

dM

acc. to DIN 2501

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

dM

distance

pressure

approx.

in / lb sq in

in/mm

in/mm

in/mm

A in/mm

lb/sq in

CK

3 / 150

71/

2

/ 134

3/

4

/ 20

23/

4

/ 70

5 / 130

––

4.5 kg

CR

4 / 150

81/

/ 158

3/

/ 20

23/

/ 70

5 / 130

2500

6.2 kg

4

4

4

18

VEGADIF 34 … 51

Product description

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

dM

acc. to DIN 11 851

Order	Socket	Cell					Compression nut					Min. mount.	Weight
code	Size/Nominal pr.	D		f		dM	G		k		m	distance A	approx.
FA	DN 50/PN 25	68		11		46	Rd78x1/ "		22		19	120	2.2 kg
FE	DN 65/PN 25	86		12		52		6	25		21	120	4.0 kg
							Rd95x1/ "
FK	DN 80/PN 25	100		12		71.5		6	29		25	120	5.1 kg
							Rd110x1/ "
								4

Isolating diaphragm as threaded socket, GA … GK

acc. to DIN 11 851

		Order	Socket	Threaded socket			Min. mounting	Weight
		code	Size/Nominal pres.	d1	G	dM	distance A	approx.
		GA	DN 50/PN 25	60	Rd78/1/ "	46	110	1.8 kg
		GA	DN 65/PN 25	66	6	52	110	3.4 kg
d	1				Rd95x1/ "
		GK	DN 80/PN 25	91	6	71.5	110	4.0 kg
d	M				Rd110x1/ "
					6

Isolating diaphragm as Clamp, HA and HK

	Order	Socket	Terminal socket		Min. mounting	Weight
	code	Size/Nominal pres.	D	dM	distance A	approx.
dM	HA	DN 2" PN 40	64	46	100	1.4 kg
	HK	DN 3" PN 40	91	71.5	100	2.4 kg

Isolating diaphragm as DRD-flange, KE
Order	Socket	Dimensions		Min. mounting	Weight
code	Nominal pr.		dM	distance A	approx.
A	PN 25	see drawing	46	100	1.5 kg
KE
dM
˘64
˘84
˘105
VEGADIF 34 … 51					19

Product description

Mounting bracket

Installation instructions

		View x
	y	18	35	35
		35
x		35
		35

4 holes

ø 10.4 mm

126

222

126

85

+ Z S

-

~195

~274

106

View y

312,5

105

165

105

119

9

106

98

ø

60

+ 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
	EEx ia IIC	EEx d IIC	EEx ia IIC	Explosion proof	Intrinsically
Type				and non incentive	safe
VEGADIF 34	•	•	•	•	•	•
VEGADIF 35	•	•	•	•	•	•
VEGADIF 44	•	•	•	•	•	•
VEGADIF 45	•	•	•	•	•	•
VEGADIF 51	•	•	•	•	•	•
20						VEGADIF 34 … 51

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.

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

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.

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 transmitter above the pressure tapping points.

•For the measurement of vapours and liquids, 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.

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.

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.

Fig. 2.2 Fastening of the locking screw

22	VEGADIF 34 … 51