Flow Meter for technical Gases - METRA Energie

Flow Meter for technical Gases
EDZ 920 thermal Mass flow meter
Assembly, Commissioning and Maintenance Instructions
EDZ 920
METRA Energie-Messtechnik GmbH
Am Neuen Rheinhafen 4 – 67346 Speyer
Telefon +49 (6232) 657 - 0
Fax
+49 (6232) 657 - 200
Internet: http://www.metra-emt.de
E-mail : info@metra-emt.de
Dimensions, weights and other technical details
subject to change.
BA EDZ 920
Printed on:
23.04.2015
EDZ 920
Contents
1 General Information ........................................................................................................................ 3 Symbols used in this manual .............................................................................................................. 3 General note........................................................................................................................................ 3 2 Application range ............................................................................................................................ 4 3 Mounting instructions ...................................................................................................................... 4 General information on handling ......................................................................................................... 4 Systems with overpressure ................................................................................................................. 4 General installation conditions ............................................................................................................ 5 Installation with low disturbance.......................................................................................................... 6 Mounting.............................................................................................................................................. 9 Mounting accessories ....................................................................................................................... 10 4 Electrical connection ..................................................................................................................... 11 Operating voltage .............................................................................................................................. 11 Analog outputs .................................................................................................................................. 11 5 Signalization.................................................................................................................................. 12 Light emitting diodes ......................................................................................................................... 12 Analog outputs .................................................................................................................................. 12 6 Startup .......................................................................................................................................... 13 7 Information concerning operation ................................................................................................. 13 Eliminating malfunctions ................................................................................................................... 14 8 Service-Information ....................................................................................................................... 15 Maintenance ...................................................................................................................................... 15 Cleaning of sensor head ................................................................................................................... 15 Transport / Shipment of the sensor ................................................................................................... 16 Recalibration ..................................................................................................................................... 16 Spare parts or repair ......................................................................................................................... 16 Test certificates and material certificates .......................................................................................... 16 9 Technical data............................................................................................................................... 17 10 EC Declaration of conformity ........................................................................................................ 18 Page 2 of 18
METRA Energie Messtechnik GmbH
EDZ 920
1 General Information
The instructions for use contain all required information for a fast commissioning and a safe
operation of the Flow Meter EDZ 920:

These instructions for use must be read completely and observed carefully, before putting the unit into operation.

Any claims under the manufacturer's liability for damage resulting from non-observance
or non-compliance with these instructions will become void.

Tampering with the device in any way whatsoever - with the exception of the designated
use and the operations described in these instructions for use - will forfeit any warranty
and exclude any liability.

The unit is designed exclusively for the use described below (see chapter 2). In particular, it is not designed for direct or indirect protection of personal or machinery.

METRA Energie-Messtechnik GmbH cannot give any warranty as to its suitability for
certain purpose and cannot be held liable for accidental or sequential damage in connection with the delivery, performance or use of this unit.
S ym b o l s u s e d i n t h i s m a nua l
The symbols used in this manual are explained in the following section.
Danger warnings and safety instructions – read them carefully!
!
Non-observance of these instructions may lead to injury of personnel or malfunction
of the device.
General note
All dimensions are indicated in mm.
Page 3 of 18
METRA Energie Messtechnik GmbH
EDZ 920
2 Application range
The EDZ 920 is designed for stationary measurement of the flow velocity as well as the temperature of pure1 air and gases at working pressure of up to 10 bar
The sensor is based on the measuring principle of the thermal anemo-meter and measures
the mass flow of the measuring medium as flow velocity which is output in a linear way as
standard velocity2 wN (unit: m/s), based on standard conditions of 1013.25 hPa and 20 °C.
Thus, the resulting output signal is independent from the pressure and temperature of the
medium to be measured. The sensor is designed for the use inside closed rooms and is not
suitable for outdoor use.
!
When using the sensor outdoors, it must be protected against direct exposure to the
weather.
3 Mounting instructions
General information on handling
The EDZ 920 is a precision instrument with high measuring sensitivity. In spite of the robust
construction of the sensor tip soiling of the inner sensor elements can lead to distortion of
measurement results (see also chapter 8 Service information). During procedures that could
stimulate soiling like transport, mounting or dismounting of the sensor it is recommended to
place the enclosed METRA Energie-Messtechnik GmbH protective cap on the sensor tip and
remove it only during operation
!
During processes with enhanced risks of soiling such as transport or mounting the
protective cap should be placed onto the sensor tip.
Systems w ith overpressu re
The EDZ 920 is designed for a working overpressure up to 10 bar. As long as the medium to
be measured is operated with overpressure, make sure that:

There is no overpressure in the system during mounting.
!

Only appropriately pressure-tight mounting accessories are used.
!

2
Only use proper pressure-tight mounting accessories (e. g. Teflon tape).
Appropriate safety precautions are taken to avoid unintended discarding of the sensor
due to overpressure.
!
1
Mounting and dismounting of the sensor in pipes can be carried out only as long
as the system is in depressurized state.
Attention: Risk of injuring if through bolt joint is loosened under pressure!
No chemically aggressive parts / abrasive particles. Check suitability in individual cases.
Corresponds to the actual flow velocity under standard conditions.
Page 4 of 18
METRA Energie Messtechnik GmbH
EDZ 920
If there are leaks in the sensor or its compressing fitting (CF) during operation, depressurize
the system immediately and replace sensor.
G e n e ra l in s talla tio n co n d itions
The sensor should preferably be installed in horizontally positioned pipes. A downward flow
with low flow speeds (< 1 m/s)3 can lead to increased deviations and must be avoided for this
reason.
!
Avoid installation in a pipe or chamber with downward flow because the lower measuring range limit can rise significantly
The sensor measures the flow speed correctly only in the direction given on the housing and
sensor head (arrow). Make sure that the sensor is adjusted in flow direction; a tilting of up to
±3° is allowed4.
!
The sensor measures unidirectional and must be adjusted correctly relative to the
flow direction.
A sensor mounted in opposite direction of the flow direction leads to wrong measuring values
(too high).
!
Due to system characteristics the lower measuring range limit of the sensor is 0.2
m/s.
The center of the chamber head is the actual measuring point of the flow measurement and
must be placed in the flow as advantageous as possible, for example in the middle of a pipe
(see chapter 9 Technical Data). Therefore this point is also used for specification of probe
length L (see Figure 3).
Flow
Messrichtung
Direction of measurement
Figure 1: Positioning in a pipe
!
3
4
The sensor head must be located in the center of the pipe to obtain a correct
measurement inside the pipe
In case of vertical downdraft and maximum overpressure of 8 bar.
Measurement deviation < 1 %
Page 5 of 18
METRA Energie Messtechnik GmbH
EDZ 920
I n s t a l l a tio n w i t h low disturbance
Local turbulences of the medium can cause distortion of measurement results. Therefore,
appropriate mounting conditions must be guaranteed to ensure that the gas flow is supplied
to the sensor in a quiet and low in turbulence state in order to maintain the accuracy specified (see chapter 9 Technical data).
!
Correct measurements require quiet flow, as low-turbulence as possible.
An undisturbed flow profile can be achieved if a sufficiently long distance in front of (run-in
distance) and behind (run-out distance) the sensor installation site (see Figure 2) is held absolutely straight and without disturbances (such as edges, seams, bends etc.). It is also necessary to pay attention to the design of the run-out distance because disturbances also generate turbulences against the flow direction.
L
= Length of entire measuring distance
L1 = Length of run-in distance
L2 = Length of run-out distance
D = Inner diameter of measuring distance
Figure 2
The following Table 1 shows the required straight conduit lengths depending on the pipe inner diameter “D” and the different disturbance causes.
Flow obstacle upstream of the measuring distance
Minimum length of
L1
Minimum length of L2
Light bend (< 90°)
10 x D
5xD
Reduction / expansion / 90° bend or Tjunction
15 x D
5xD
Two 90° bends in one plane (2dimensional)
20 x D
5xD
Two 90° bends (3-dimensional change in
direction)
35 x D
5xD
Shut-off valve
45 x D
5xD
Table 1
This table lists the minimum values required in each case. If the listed straight conduit
lengths cannot be achieved, measurement accuracy may be impaired5. The profile factors
specified in Table 1 may become void by the use of flow rectifiers.
5
Alternatively flow rectifier could be used, e.g. honeycomb ceramics.
Page 6 of 18
METRA Energie Messtechnik GmbH
EDZ 920
Calculation of volume flow
If the cross section area of the pipe is known, the output signal of the flow speed can be used
to calculate the standard volumetric flow of the medium. By means of a correction factor PF6,
which depends on the pipe diameter the measured value can be converted to an averaged
flow wN which is constant over the whole pipe cross-section.
Thus, it is possible to calculate the standard volumetric flow of the medium using the measured standard flow velocity in a pipe with known inner diameter:
A

 D2
4
w N  PF  w N
V  w  A  3600
N
N
D
A
Inner diameter of pipe [m]
2
Cross-section area of pipe [m ]
wN
Flow velocity in the middle of the pipe [m/s]
wN
Average flow velocity in the pipe [m/s]
PF
Profile factor (for pipes with circular cross-sections)
VN
Standard volumetric flow [m³/h]
METRA Energie-Messtechnik GmbH provides a convenient calculation tool to compute flow
velocity or volume flow in pipes for all its sensor types and measuring ranges.
6
Considers the parabolic flow profile and the sensor obstruction.
Page 7 of 18
METRA Energie Messtechnik GmbH
EDZ 920
Table 2 lists profile factors and volume flow measuring ranges (with certain sensor measuring ranges) for standard pipe diameters.
Nominal
size
25
Norm value
Inner
DN
[inch]
[mm]
PF
0.2 m/s
40 m/s
60 m/s
90 m/s
25
1
26.0
28.5
32.8
36.3
39.3
43.1
45.8
51.2
54.5
57.5
64.2
70.3
76.1
82.5
100.8
107.1
125.0
131.7
150.0
159.3
182.5
190.0
206.5
260.4
309.7
339.6
388.8
437.0
486.0
534.0
585.0
0.796
0.796
0.796
0.770
0.748
0.757
0.763
0.772
0.775
0.777
0.782
0.786
0.792
0.797
0.804
0.806
0.812
0.814
0.817
0.820
0.825
0.826
0.829
0.835
0.840
0.842
0.845
0.847
0.850
0.852
0.854
0.30
0.37
0.48
0.57
0.65
0.80
0.91
1.14
1.30
1.45
1.82
2.20
2.59
3.07
4.62
5.23
7.17
7.98
10.40
11.77
15.54
16.86
19.99
32.02
45.56
54.91
72.23
91.47
113.53
137.39
165.27
61
73
97
115
131
159
181
229
260
291
365
439
519
614
924
1,046
1,435
1,597
2,079
2,353
3,108
3,372
3,998
6,404
9,112
10,982
14,446
18,294
22,706
27,477
33,054
91
110
145
172
196
239
272
343
391
436
547
659
778
920
1,386
1,568
2,152
2,395
3,119
3,53
4,661
5,059
5,997
9,605
13,668
16,474
21,670
27,440
34,059
41,216
49,581
137
165
218
258
294
358
407
515
586
654
820
988
1,167
1,380
2,079
2,353
3,229
3,593
4,678
5,295
6,992
7,588
8,996
14,408
20,502
24,711
32,505
41,161
51,089
61,824
74,371
32
40
40
1 1/4
1 1/2
50
50
2
65
65
2 1/2
80
100
110
125
130
150
160
170
190
200
80
100
3
4
125
125
150
5
300
400
450
500
550
600
Volumetric flow [m 3/h]
Profile
faktor
Diameter of measuring pipe
200
250
300
350
400
450
500
550
600
6
Min. @
@ sensor measuring range [m/s]
Table 2
Page 8 of 18
METRA Energie Messtechnik GmbH
EDZ 920
Mounting
The sensor is installed using its integrated through-bolt joint. Normally, a sleeve is welded as
a connecting piece onto a bore in the medium-guiding pipe, in which the external thread (G½
or Rp½) of the through-bolt joint is screwed (see Figure 3).
AL
DA
MET=20
8
SL
32
E
66
L
Figure 3
L
SL
AL
DA
MET
E
Sensor length [mm]
Length of the weld-in sleeve [mm]
Projecting length [mm]
Outer diameter of the pipe [mm]
Sensor tube setting length [mm]
Minimum immersion depth [mm]
Note:
!
Before mounting depressurize system with overpressure media
 Bore a mounting opening in a pipe wall.
 Weld connecting piece with an internal thread G½ resp. Rp½ in the center above the
mounting opening on the pipe.
 Recommended length of connecting piece: 15 ... 40 mm
 Slacken spigot nut of through-bolt joint (SW17) to such an extent that sensor probe can
be moved without jamming and push it up carefully to the dead end of the sensor head.
 Depending on type of through-bolt joint:
- G½: Check if O-ring seal is installed and fitted tightly.
- Rp½: Wrap thread with a common sealing tape, for example made of PTFE.
 Plug the holding bracket of the pressure protection chain into the thread of the throughbolt joint.
 Remove protective cap from sensor tip.
 Screw threaded part of through-bolt joint one or two turns by hand into connecting piece.
 In case of a longer sensor probe push it partly into the pipe then screw thread firmly into
connecting piece (hexagon SW27).
!
Page 9 of 18
Always avoid bending of the probe during screwing.
METRA Energie Messtechnik GmbH
EDZ 920

Observe the correct seat and alignment of the chain bracket.

Carefully slide probe so that the center of the chamber head is placed at the optimum
measuring position in the middle of the pipe.
Tighten spigot nut slightly by hand so that sensor is fixed.
Turn sensor manually at its enclosure into required direction and precise position while
maintaining immersion depth.


Angular deviation should not be greater than  3° relative to ideal measuring direction.
!



Hold sensor and tighten spigot nut by turning the fork wrench (SW17) a quarter of a turn.
Recommended torque: 10 … 15 Nm
Check the set angular position carefully, for example by means of a spirit level at the octagonal part of the sensor enclosure.
Make sure to close the safety chain before pressure is applied. The chain lock must be
hung up in a way to avoid sagging of the chain (see Figure 4).
Figure 4: Safety chain
Mounting accessories
Type / Article-No.
34
Rp 1/2
a.) 524 916
b.) 524 882
26,6
Clamp
Drawing
7
Mounting
- Internal thread Rp½
- Material:
a.) Steel, black
b.) Stainless steel 1.4571
Table 4
7
Must be welded.
Page 10 of 18
METRA Energie Messtechnik GmbH
EDZ 920
4 Electrical connection
The sensor is equipped with a 4-pin cable firmly fixed to the sensor enclosure (pin assignment refers to Table 5).
Wire color
Designation
Function
Brown
(BR)
Power
Operating voltage: +UB
White
(WH)
GND
Operating voltage: Mass
Yellow
(YE)
Analog wN
Output signal: Speed
Green
(GR)
Analog TM
Output signal: Temperature of the medium
Table 5
During electrical installation ensure that no voltage is applied and inadvertent activation is not possible.
!
Operating voltage
For proper operation the sensor requires DC voltage with a nominal value of 24 V with permitted tolerance of ±10 %. %. It is protected against a polarity reversal; typical operating current is 40 mA, at maximum 60 mA8.
Only operate sensor within the defined range of operating voltage (24 V DC ± 10
%).
Undervoltage may result in malfunction; overvoltage may lead to irreversible
damage to the sensor.
!
Analog outputs
Both analog outputs signalizing flow and temperature of the medium are designed as 4 … 20
mA current interface which exhibits permanent short-circuit protection against both rails of
the operating voltage UB.
BR
+
-
GR
1µF
A
RL
CL
UB
+
WH
Figure 5
The apparent ohmic resistance RL of max. 300  must be connected between the signal output and GND (see Figure 5).
Load capacity CL is limited to a maximum of 10 nF.
.
8
Both signal outputs 22 mA (maximum measuring values), minimum operating voltage.
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METRA Energie Messtechnik GmbH
EDZ 920
5 Signalization
L i g h t e m ittin g d io d es
The sensor is equipped with 2 light emitting diodes (LED) indicating its functional state.
Flow
LED 1
LED 2
Figure 6
Operating state
LED 1
LED 2
Supply voltage too low
Ready for operation
Supply voltage too high
medium temperature beyond specification range
Sensor defective
LED off
LED flashes (approx. 2 Hz): green
LED on: green
LED flashes (approx. 2 Hz): red
Analog outputs

Error signaling
The current interface delivers 2 mA9.


Representation of flow velocity
The measuring range of the corresponding measuring value is mapped in a linear way to
the signaling range of its analog output.

For flow measurement the measuring range reaches from zero to the selectable end of
the measuring range wN,max (= 100 % in Figure 5). A higher flow up to 110 % = 21.6 mA)
is still output in a linear way, moreover the signal remains constant.
Flow velocity wN
Medium temperature TM
IOut
IOut
[mA]
[m A]
22
22
20
20
16
16
12
12
8
8
4
4
2
0
0
20
wN 
40
wN ,max
16mA
60
80
100 112,5 wN [%]
 ( I Out , wN  4mA)
-40
TM 
-20
0
20
40
60 + 85 90
TM [°C]
105C
 ( I Out , wN  4mA)  20C
16mA
Figure 6: Representation specification for measuring functions
9
In accordance with NAMUR specification.
Page 12 of 18
METRA Energie Messtechnik GmbH
EDZ 920

Representation of medium temperature
The measuring range of the medium temperature is -20 to +85 °C. Falling below this
temperature causes the emission of an error message of this signal output (2 mA). An
exceeded temperature is output in a linear way up to 90 °C, moreover the temperature
output leaps to approx. 22 mA and the flow output drops to 2 mA.
!
Even short-term overshooting of the operating medium temperature can cause
irreversible damage of the sensor
!
For a correct temperature measurement, the flow velocity on the sensor head
must be > 2 m/s. An excessive temperature value is output if flow velocity is < 2
m/s.
6 Startup
Prior to switching on the EDZ 920 the following checks have to be carried out:

Immersion depth of the sensor probe and alignment of the housing

Tightening of the fastening screw of the through-bolt joint, correct installation of safety
chain

Correct electrical connection in the field (switch cabinet or similar)
!
For measurements in media with overpressure check if the fastening screw is
tightened properly (10 … 15 Nm). Make sure to close the safety chain before
pressure is applied.
5 seconds after switch-on the sensor is ready for operation. If the sensor has another temperature than the ambient, this time is prolonged until the sensor has reached its ambient
temperature.
If the sensor has been stored at very cold conditions, before commissioning you have to wait
until the sensor and its housing have reached ambient temperature.
7 Information concerning operation
The sensor is optimized for an operating overpressure10 of 8 barop. If it is used with lower
pressures, the detection limit (DL) rises slightly. Higher pressures can cause a minimum output signal at zero flow.
Example: DL (8 barop) = 0.2 m/s, DL (0 barop) = 0.8 m/s
Soiling or other gratings on the sensor cause distortions of measurements.
!
10
Therefore, the sensor must be checked for soiling at regular intervals and cleaned if
necessary.
Maximum overpressure: 10 bar
Page 13 of 18
METRA Energie Messtechnik GmbH
EDZ 920
!
(Condensating) liquid on the sensor causes serious measurement distortions.
After drying the correct measuring function is restored.
El i mi n a tin g malfunctio n s
The following table lists possible errors (error images). A description of the way to detect errors is given. Furthermore, the possible causes and measures to be taken to eliminate errors
are listed.
Error image
IwN , ITM = 0 mA
Possible causes
Troubleshooting
Problems with supply voltage UB:
 No UB available
 UB has wrong polarity
 UB < 15 V
 Sensor cable connected correctly?
 Supply voltage connected to the control?
 Supply cable broken?
 Power supply unit large enough?
Sensor defective
Sensor element defective
Send the sensor for repair
IwN , ITM = 2 mA
Operating voltage too high
IwN = 2 mA
ITM = 2 / 22 mA
Check the operating voltage and reduce it
Check the medium temperature and set it
Medium temperature beyond speci- correctly
fication range
Flow signal wN is  Measuring range too small
too large / small
/large

Medium to be measured does not
correspond to air
 Sensor element soiled
 Sensor installed in opposite direction to flow direction
Check sensor configuration
Check measuring resistance
Is the foreign gas factor correct?
Clean sensor tip
Check the installation direction
Flow signal wN is  UB unstable

fluctuating
 Mounting conditions:

 Sensor head is not in optimal
position
 Run-in/run-out distance is too 
short
 Strong fluctuations of pressure
or temperature
Check the voltage supply
Check mounting conditions
Check operating parameters
Table 6
Page 14 of 18
METRA Energie Messtechnik GmbH
EDZ 920
8 Service-Information
Maintenance
Soiling of the sensor head may lead to distortion of the measured value. Therefore, the sensor head must be checked for contamination at regular intervals. If contaminations are visible, the sensor can be cleaned as described below.
Cleaning of sensor head
If the sensor head is soiled or dusty, it must be cleaned carefully by means of compressed
air.
!
The sensor head is a sensitive measuring system.
During manual cleaning proceed with great care.
In case of persistent deposits, the sensor chip as well as the interior of the chamber head
can be cleaned carefully by using residue-free drying alcohol (e.g. isopropyl alcohol) or
soapy water with special cotton swabs.
Figure 8-1: Suitable cotton swabs with small cleaning pads
For this purpose cotton swabs that have small, soft cotton pads are suitable, e.g. type "SP4"
of the brand "CONSTIX Swabs" of the manufacturer "CONTEC". The flat, narrow side of the
pads fit just between chamber head wall and sensor chip and therefore exerts a controlled,
minimal pressure on the chip. Conventional cotton swabs are too big and therefore can break
the chip.
!
Under no circumstances do attempt to pressurize the chip with greater force (e.g. by
swabs with thick head or lever movements with its stick).
Mechanical overloading of the sensor element can lead to irreversible damage.
The sticks must be moved only with great care parallel to the chip surface back - and – forth
to rub off the pollution. If necessary, several cotton swabs have to be used.
Before putting it into operation again, wait until the sensor head is completely dried. The drying process can be accelerated by gently blowing.
Page 15 of 18
METRA Energie Messtechnik GmbH
EDZ 920
If this procedure does not help, the sensor must be sent to METRA Energie-Messtechnik
GmbH in Speyer for cleaning or repair.
Transport / Shipment of the sensor
Before transport or shipment of the sensor, the delivered protective cap must be placed onto
the sensor tip. Avoid soiling or mechanical stress.
Recalibration
If the customer has made no other provisions, we recommend repeating the calibration at a
12-month interval. To do so, the sensor must be sent in to the manufacturer.
Spare parts or repair
No spare parts are available, since a repair is only possible at the manufacturer's facilities. In
case of defects the sensors must be sent in to the producer for repair.
If the sensor is used in systems important for operation, we recommend you to keep a replacement sensor in stock.
T e s t c e r t i f i c a t e s a n d m aterial cert if icat es
Every new sensor is accompanied by a certificate of compliance according to EN10204-2.1.
Material certificates are not available.
Upon request, we shall prepare, at a charge, a factory calibration certificate, traceable to national standards.
Page 16 of 18
METRA Energie Messtechnik GmbH
EDZ 920
9 Technical data
Measuring parameters
Standard velocity wN of air, based on standard conditions 20 °C and
1013.25 hPa
Medium temperature TM
Medium to be measured
Air or nitrogen, other gases on request
Measuring range wN
0 ... 40 / 60 / 90 m/s
Lower detection limit wN
0.2 m/s
Measuring accuracy
- Standard
- Precision
11
wN
±(5 % of measured value+ [0.4 % of final value; min. 0.02 m/s])
±(3 % of measured value+ [0.4 % of final value; min. 0.02 m/s])
Reproducibility wN
±1.5 % of measured value
Response time (t90 ) wN
3s (jump from 5 to 0 m/s)
Measuring range TM
-20 ... +85 °C
Measuring accuracy TM
(wN ≥ 2 m/s)
±1 K (0 ... 40 °C)
±2 K (remaining measuring range)
Operating temperature
- Medium
- Electronics
-20 ... +85 °C
0 ... +70 °C
Humidity range
0 ... 95 % rel. humidity (RH), non-condensing
Operating overpressure
≤ 10 bar
Operating voltage UB
24 VDC ± 10 % (reverse voltage protected)
Current consumption
typ. < 40 mA, 60 mA max.
Analog outputs
- Type Current output
- Maximum load capacity
2 pcs. (short-circuit protected)
4 ... 20 mA (RL ≤ 300 )
10 nF
Electrical connection
Non-detachable connecting cable, pigtail12, 4-pin, length 2 m
Maximum cable length
100 m
Type of protection
IP 54 (enclosure), IP 66 (sensor)
Protection class
III (SELV) or PELV (according EN 50178)
Mounting tolerance
±3° (relative to flow direction)
Min. tube diameter
DN 25
Mounting
Integrated through-bolt joint G½ or R½
Probe length L
200 / 350 mm
Weight
250 g max.
Table 7
11
12
Under conditions of the reference
With cable end sleeves
Page 17 of 18
METRA Energie Messtechnik GmbH
EDZ 920
10 EC Declaration of conformity
The purchaser must check the specifications and technical data contained in the catalogues, brochures and other written documents, e.g. drawings and offers, prior
to acceptance and usage. METRA EMT or METRA EMT employees cannot be made liable on the basis of these documents or additional services, except for in the
case of intent and gross negligence. METRA EMT reserves the right to modify its products – including already ordered products – within a reasonable scope without
prior notice.
All trademarks contained in this publication are the property of their respective companies. METRA EMT and the META EMT logo are trademarks of METRA SA.
All rights reserved
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METRA Energie Messtechnik GmbH
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