GEM 127 Series User manual

GEMÜ 127x
Instrument sensor
Operating instructions
EN

All rights including copyrights or industrial property rights are expressly reserved.
Keep the document for future reference.
© GEMÜ Gebr. Müller Apparatebau GmbH & Co. KG
02.08.2021
www.gemu-group.com2 / 20GEMÜ 127x

Contents
1 General information ............................................. 4
1.1 Information .................................................... 4
1.2 Symbols used ................................................ 4
1.3 Warning notes ............................................... 4
2 Safety information ............................................... 5
3 Manufacturer's information .................................. 5
3.1 Delivery .......................................................... 5
3.2 Transport ....................................................... 5
3.3 Packaging ...................................................... 5
3.4 Storage ........................................................... 5
4 Product description ............................................. 6
4.1 Construction .................................................. 6
4.1.1 GEMÜ 1270/1271 construction ...... 6
4.1.2 GEMÜ 1272/1273 construction ...... 6
4.2 GEMÜ 1272/1273 status LED ....................... 6
4.3 Function ......................................................... 6
4.3.1 GEMÜ 1270 / 1271 function ............ 6
4.3.2 GEMÜ 1272 / 1273 function ............ 6
4.4 GEMÜ CONEXO ............................................. 6
4.5 Product label ................................................. 7
5 Correct use .......................................................... 7
6 Order data GEMÜ 1270, 1272 ............................... 8
7 Order data GEMÜ 1271, 1273 ............................... 9
8 Technical data ..................................................... 10
8.1 Mechanical data ............................................ 10
8.2 Electrical data ................................................ 10
9 Dimensions .......................................................... 11
10 Assembly ............................................................ 12
11 Electrical connection ........................................... 13
11.1 Inserting the cable ......................................... 13
11.2 GEMÜ 1270 / 1271 electrical connection .... 13
11.3 GEMÜ 1272 / 1273 electrical connection .... 13
11.4 Mounting the plug ......................................... 13
12 Commissioning .................................................... 14
12.1 Initialization of 1272, 1273 ........................... 14
12.1.1 Resetting the product ...................... 14
12.2 Commissioning the flowmeter ..................... 14
13 Operation ............................................................. 14
14 Maintenance ........................................................ 15
14.1 Inspection ...................................................... 15
14.2 Spare parts .................................................... 15
15 Troubleshooting .................................................. 16
15.1 Troubleshooting ............................................ 16
15.2 LED error message ........................................ 16
16 Disposal .............................................................. 17
17 Returns ................................................................ 17
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www.gemu-group.com4 / 20GEMÜ 127x
1 General information
1 General information
1.1 Information
•The descriptions and instructions apply to the standard ver-
sions. For special versions not described in this document
the basic information contained herein applies in combina-
tion with any additional special documentation.
•Correct installation, operation, maintenance and repair work
ensure faultless operation of the product.
•Should there be any doubts or misunderstandings, the Ger-
man version is the authoritative document.
•Contact us at the address on the last page for staff training
information.
1.2 Symbols used
The following symbols are used in this document:
Symbol Meaning
Tasks to be performed
Response(s) to tasks
– Lists
1.3 Warning notes
Wherever possible, warning notes are organised according to
the following scheme:
SIGNAL WORD
Type and source of the danger
Possible
symbol for the
specific
danger
Possible consequences of non-observance.
Measures for avoiding danger.
Warning notes are always marked with a signal word and
sometimes also with a symbol for the specific danger.
The following signal words and danger levels are used:
DANGER
Imminent danger!
▶Non-observance can cause death or
severe injury.
WARNING
Potentially dangerous situation!
▶Non-observance can cause death or
severe injury.
CAUTION
Potentially dangerous situation!
▶Non-observance can cause moderate
to light injury.
NOTICE
Potentially dangerous situation!
▶Non-observance can cause damage to
property.
The following symbols for the specific dangers can be used
within a warning note:
Symbol Meaning
Risk of electric shock

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2 Safety information
The safety information in this document refers only to an indi-
vidual product. Potentially dangerous conditions can arise in
combination with other plant components, which need to be
considered on the basis of a risk analysis. The operator is re-
sponsible for the production of the risk analysis and for com-
pliance with the resulting precautionary measures and re-
gional safety regulations.
The document contains fundamental safety information that
must be observed during commissioning, operation and main-
tenance. Non-compliance with these instructions may cause:
•Personal hazard due to electrical, mechanical and chemical
effects.
•Hazard to nearby equipment.
•Failure of important functions.
•Hazard to the environment due to the leakage of dangerous
materials.
The safety information does not take into account:
•Unexpected incidents and events, which may occur during
installation, operation and maintenance.
•Local safety regulations which must be adhered to by the
operator and by any additional installation personnel.
Prior to commissioning:
1. Transport and store the product correctly.
2. Do not paint the bolts and plastic parts of the product.
3. Carry out installation and commissioning using trained
personnel.
4. Provide adequate training for installation and operating
personnel.
5. Ensure that the contents of the document have been fully
understood by the responsible personnel.
6. Define the areas of responsibility.
7. Observe the safety data sheets.
8. Observe the safety regulations for the media used.
During operation:
9. Keep this document available at the place of use.
10. Observe the safety information.
11. Operate the product in accordance with this document.
12. Operate the product in accordance with the specifications.
13. Maintain the product correctly.
14. Do not carry out any maintenance work and repairs not de-
scribed in this document without consulting the manufac-
turer first.
In cases of uncertainty:
15. Consult the nearest GEMÜ sales office.
3 Manufacturer's information
3.1 Delivery
●Check that all parts are present and check for any damage
immediately upon receipt.
The product's performance is tested at the factory. The scope
of delivery is apparent from the dispatch documents and the
design from the order number.
3.2 Transport
1. Only transport the product by suitable means. Do not drop.
Handle carefully.
2. Avoid knocks and vibration.
3. Dispose of transport packing materials according to relev-
ant local or national disposal regulations/environmental
protection laws after installation.
3.3 Packaging
The product is packaged in a cardboard box which can be re-
cycled as paper.
3.4 Storage
1. Store the product free from dust and moisture in its ori-
ginal packaging.
2. Avoid UV rays and direct sunlight.
3. Do not exceed the maximum storage temperature (see
chapter "Technical data").
4. Do not store solvents, chemicals, acids, fuels or similar
fluids in the same room as GEMÜ products and their spare
parts.
5. Store the product with the connections blocked off.
3 Manufacturer's information

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4 Product description
4 Product description
4.1 Construction
4.1.1 GEMÜ 1270/1271 construction
3
1
2
Item Name
1 Plug
2 Instrument sensor
3 Locking screw
4.1.2 GEMÜ 1272/1273 construction
6
5
4
1
3
2
Item Name
1 Plug
2 LED display
3 Instrument sensor
4 Locking screw
5 "Min" key
6 "Max" key
4.2 GEMÜ 1272/1273 status LED
LED Status Description
red Product not ready for operation and not
initialized:
Output 21 mA (standard range: 4–20
mA)
LED Status Description
Magnet not recognized:
•Float is within the range of the instru-
ment sensor:
Wrong float/inappropriate variable
area flowmeter
•Float is outside the range of the in-
strument sensor:
Value outside the measuring range
green Product ready for operation and initial-
ized
Acceptance of the value upon initializa-
tion of the product
LED conditions
lit (on) flashes
4.3 Function
Fig.1: Instrument sensor operating principle
The float in the flowmeter, which is equipped with a perman-
ent magnet, is pushed past the instrument sensor by the flow.
The instrument sensor is equipped with a reed contact chain.
This enables reading out the float position.
4.3.1 GEMÜ 1270 / 1271 function
The GEMÜ 1270 / 1271 instrument sensors output the meas-
ured values as a voltage signal via a voltage divider (Rg = 10
kΩ).
4.3.2 GEMÜ 1272 / 1273 function
The GEMÜ 1272 / 1273 instrument sensors output the meas-
ured values as a 2-wire current signal 4 - 20 mA. This signal
can be directly processed.
4.4 GEMÜ CONEXO
The interaction of valve components that are equipped with
RFID chips and an associated IT infrastructure actively in-
crease process reliability.

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Thanks to serialization, every valve and every relevant valve
component such as the body, actuator or diaphragm, and
even automation components, can be clearly traced and read
using the CONEXO pen RFID reader. The CONEXO app, which
can be installed on mobile devices, not only facilitates and im-
proves the "installation qualification" process, but also makes
the maintenance process much more transparent and easier
to document. The app actively guides the maintenance techni-
cian through the maintenance schedule and directly provides
him with all the information assigned to the valve, such as
test reports, testing documentation and maintenance histor-
ies. The CONEXO portal acts as a central element, helping to
collect, manage and process all data.
For further information on GEMÜ CONEXO please visit:
www.gemu-group.com/conexo
In the corresponding design with CONEXO, this product has
an RFID chip (1) for electronic recognition. The position of the
RFID chip can be seen below.
Installing the RFID chip
RFID chip
4.5 Product label
Device version Design in accordance with order data
Item number Traceability number Serial number
Device-specific data
Year of manufacture
The manufacturing month is coded under the traceability
number and can be requested from GEMÜ. The product was
manufactured in Germany.
5 Correct use
WARNING
Improper use of the product
▶Risk of severe injury or death.
▶Manufacturer liability and guarantee will be void.
●Only use the product in accordance with the operating
conditions specified in the contract documentation and in
this document.
The products must:
•only be used for measuring the flowmeters of the GEMÜ
800, GEMÜ 840 and GEMÜ 850 series.
•only be operated within the performance limits.
•not be modified from a constructional point of view.
The product is not intended for use in potentially explosive
areas.
5 Correct use

6 Order data GEMÜ 1270, 1272
Order codes
1 Type Code
Instrument sensor for variable area flowmeter 1270
Instrument sensor for variable area flowmeter 1272
2 Fieldbus Code
Without 000
3 Accessory Code
Accessory Z
4 Series Code
Series 800,
DN 20 - DN 65
25
5 Resolution Code
55 contacts 01
100 contacts 03
6 CONEXO Code
Without
Integrated RFID chip for electronic identification
and traceability
C
Order example
Ordering option Code Description
1 Type 1270 Instrument sensor for variable area flowmeter
2 Fieldbus 000 Without
3 Accessory Z Accessory
4 Series 25 Series 800,
DN 20 - DN 65
5 Resolution 01 55 contacts
6 CONEXO Without
6 Order data GEMÜ 1270, 1272
www.gemu-group.com8 / 20GEMÜ 127x

7 Order data GEMÜ 1271, 1273
The order data provide an overview of standard configurations.
Please check the availability before ordering. Other configurations available on request.
Order codes
1 Type Code
Instrument sensor
for variable area flowmeter
1271
Instrument sensor
for variable area flowmeter
1273
2 Fieldbus Code
without 000
3 Accessory Code
Accessory Z
4 Series Code
Series 850,
DN 10 - DN 20
10
4 Continuation of Series Code
Series 850,
DN 25
25
5 Resolution Code
35 contacts,
GEMÜ 865, 867, 880, 885 DN 10 - DN 20
43 contacts,
GEMÜ 865, 867, 880, 885 DN 25
01
100 contacts 03
6 CONEXO Code
Without
Integrated RFID chip for electronic identification
and traceability
C
Order codes
Ordering option Code Description
1 Type 1271 Instrument sensor
for variable area flowmeter
2 Fieldbus 000 without
3 Accessory Z Accessory
4 Series 10 Series 850,
DN 10 - DN 20
5 Resolution 01 35 contacts,
GEMÜ 865, 867, 880, 885 DN 10 - DN 20
43 contacts,
GEMÜ 865, 867, 880, 885 DN 25
6 CONEXO Without
Integrated RFID chip for electronic identification and traceability
7 Order data GEMÜ 1271, 1273
www.gemu-group.com 9 / 20 GEMÜ 127x

8 Technical data
8.1 Mechanical data
Protection class: IP 65
Measured data: Device type Number of
switch points
Metering
length
Distance of
reed contacts
GEMÜ 1270000Z2501 55 230 mm 4,25 mm
GEMÜ 1270000Z2503 100 230 mm 2,30 mm
GEMÜ 1271000Z1001 35 118 mm 3,50 mm
GEMÜ 1271000Z2501 43 147 mm 2,30 mm
GEMÜ 1272000Z2501 55 210 mm 4,25 mm
GEMÜ 1272000Z2503 100 210 mm 2,30 mm
GEMÜ 1273000Z1001 35 118 mm 3,50 mm
GEMÜ 1273000Z2501 43 125 mm 3,50 mm
8.2 Electrical data
Supply voltage: GEMÜ 1270, 1271: max. 24 V DC
GEMÜ 1272, 1273: Umin 11 V DC + 0.02 A x load resistor (Ω)
Umax 40 V DC
For values see diagram
max. permissible voltage 40 V
Load resistor max. 1400 Ω
Max. power consumption: V x 20 mA
Output current: 4 - 20 mA
Detection of measured val-
ues:
Series of reed contacts connected to a chain of resistors 0 – 10 kΩ
Electrical connection
type:
Plug, design B
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8 Technical data

9 Dimensions
56
50
24
15
42,5
20
4,5
255
9
59,5
5
50
4,5
27
46
17,4
20
155
23,2
20
32,8
169
24
56
50
15
23,2
32,8
42,5
4,5
GEMÜ 1270, 1272 GEMÜ 1271, 1273
DN 10 - 20 DN 25
Dimensions in mm
GEMÜ 127xwww.gemu-group.com 11 / 20
9 Dimensions

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10 Assembly
10 Assembly
NOTICE
▶If several flowmeters with instrument sensors are in-
stalled next to each other, the minimum distance between
the instrument sensors 2 must be at least 150 mm.
2
150 mm
Fig.2: Minimum distance between instrument sensors
1
4
5
2
3
3
3
Fig.3: Assembling the instrument sensor
1. For DN 10 and DN 15: Break off plates 4 and5 before
mounting the instrument sensor 2.
For DN 20: Do not break off plates 4 and 5.
For DN ≥ 25: Plates are non-existent.
2. Clamp the instrument sensor 2 onto the dovetail 1 on the
metering tube.
3. Adjust the position by moving it up/down the metering
tube: the upper edge of the instrument sensor 2 must be
aligned with the upper edge of the dovetail 1.
1
2
3
4. Fix the position with the locking screws 3.
ðThe instrument sensor is assembled.

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11 Electrical connection
DANGER
Risk of electric shock
▶Risk of injury or death (if operating
voltage is higher than safe extra low
voltage).
▶Electric shock can cause severe burns
and fatal injury.
●Work on electrical connections only by
qualified trained personnel.
●Disconnect the cable from the power
supply before making the electrical
connection.
●Connect the protective earth con-
ductor.
11.1 Inserting the cable
Fig.4: Inserting the cable
1. Undo the cable gland 1 and screw 5.
2. Guide the cable through the cable gland 1, washer 2 and
rubber sleeve 3 and then through the plug housing 4.
3. Connect the cable depending on the type of limit switch.
4. Push the rubber sleeve 3 and washer2 into the plug hous-
ing 4.
5. Tighten the cable gland.
11.2 GEMÜ 1270 / 1271 electrical connection
1
2
3
+
-
internal external
Fig.5: GEMÜ 1270 / 1271 electrical connection
2
3
1
Fig.6: Connection to terminal block
Item Connection
1 Uv-, supply voltage (-)
Us-, signal voltage (-)
2 Uv+, supply voltage (+)
3 Us+, signal voltage (+)
11.3 GEMÜ 1272 / 1273 electrical connection
1
2
+
-
U
I
internal external
Fig.7: GEMÜ 1272 / 1273 electrical connection
2
3
1
Fig.8: Connection to the terminal block
Item Connection
1 Signal (-)
2 Signal (+)
3 n. c.
11.4 Mounting the plug
1. Push the plug onto the mount.
2. Fix the plug with the screw.
ðThe plug is mounted.
11 Electrical connection

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12 Commissioning
12 Commissioning
12.1 Initialization of 1272, 1273
The instrument sensors must be calibrated prior to commis-
sioning with the adjustment potentiometers. The adjustment
must be carried out with the signal receiver at 20% (= 7.2 mA)
and 80% (= 16.8 mA) volumetric flow, in order to compensate
for the difference between the linear output signal and the
non-linear scaling of the flowmeters.
3
1
2
24 V
1. Connect mA-measurement device as specified on the in-
strument sensor.
2. Allow 20% volumetric flow to run through the flowmeter.
3. Press "min" key 1.
ðLED display 2 flashes green, the value has been accep-
ted.
ðLED display 2 goes off.
4. Allow 80% volumetric flow to run through the flowmeter.
5. Press "max" key 3.
ðLED display 2 flashes green, the value has been accep-
ted.
ðLED display 2 lights up green, the product is initialized and
ready for operation.
12.1.1 Resetting the product
3
1
To carry out a reset of the product, press the 1 "min" and 3
"max" keys simultaneously.
The reset is completed when the status LED lights up red.
A reset must be performed in the following scenarios and
then the product must be reinitialized:
•If a user error has occurred when initializing the product.
•If the initialization result is not satisfactory.
•If another float/variable area flowmeter is used.
12.2 Commissioning the flowmeter
●Commission the flowmeter (see installation, operating and
maintenance instructions for the flowmeter).
13 Operation
The position of the float during operation is communicated to
the evaluating unit via the relevant electrical output of the in-
strument sensor.

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14 Maintenance
CAUTION
Use of incorrect spare parts!
▶Damage to the product.
▶Manufacturer liability and guarantee will be void.
●Only the spare parts specified below must be replaced.
●The device must only be repaired by GEMÜ.
Preventive maintenance/cleaning is recommended depending
on the operating conditions.
14.1 Inspection
1. The operator must carry out regular visual examinations
of the product, depending on the operating conditions and
the potentially hazardous situations, in order to prevent
damage.
2. At regular intervals, depending on the operating and ambi-
ent conditions, the product and the electrical wiring must
be checked for deposits of dirt, damage and cracks and, if
required, they must be cleaned.
3. Replace the product and/or electrical wiring in the case of
damage.
4. The operator is responsible for determining appropriate in-
spection intervals.
14.2 Spare parts
Spare part Order number
Plug On request
Instrument sensor On request
When ordering spare parts, please provide the following in-
formation:
•Complete order code
•Name of spare part
14 Maintenance

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15 Troubleshooting
15 Troubleshooting
15.1 Troubleshooting
Error Possible cause Troubleshooting
The product does not output any signal Connector interrupted Check connector and if necessary ex-
change plug
Float is not equipped with a permanent
magnet
Replace with a float with a permanent
magnet
Cable interrupted Check cable, if necessary replace
Faulty product Replace product
The product does not output any continu-
ous signal
Faulty product Replace product
Variable flow Dampen pulsation of flow
The product outputs an irregular signal,
which does not correspond to the float
position
Faulty product Replace product
When several flowmeters are installed
next to each other, the instrument
sensors may interfere with each other
and send false signals
Minimum distance between instrument
sensors too low
Ensure 150 mm minimum distance
between the instrument sensors
15.2 LED error message
LED Status Error cause Troubleshooting
red Magnet not recognized Check float/variable area flow-
meter and replace if necessary
Ensure that the float is within
the range of the instrument
sensor
red Product not ready for opera-
tion and not initialized
Initialize product
Output 21 mA (standard range:
4–20 mA)
LED conditions
lit (on) flashes

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16 Disposal
1. Dispose of the profile packing as domestic-waste-type
commercial waste.
2. Dispose of the plug and the limit switch as electronics
scrap.
17 Returns
Legal regulations for the protection of the environment and
personnel require that the completed and signed return deliv-
ery note is included with the dispatch documents. Returned
goods can be processed only when this note is completed. If
no return delivery note is included with the product, GEMÜ
cannot process credits or repair work but will dispose of the
goods at the operator's expense.
1. Clean the product.
2. Request a return delivery note from GEMÜ.
3. Complete the return delivery note.
4. Send the product with a completed return delivery note to
GEMÜ.
17 Returns

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www.gemu-group.com 19 / 20 GEMÜ 127x

GEMÜ Gebr. Müller Apparatebau GmbH & Co. KG
Fritz-Müller-Straße 6-8, 74653 Ingelfingen-Criesbach, Germany
Phone [phone] · [email protected]
www.gemu-group.com
Subject to alteration
08.2021 | 88659290
*88659290*