Changeover contact, GEMU 1250
Limit switches, GEMU 1251-1257 for flowmeters operating on the variable area principle. Reading of the level of the float at the switching points.
Instrument sensors, GEMU 1270-1273 for flowmeters operating on the variable area principle. Continuous reading of the level of the float.
A change-over contact is built into the limit switch.
Bistable reed contacts are built into the limit switches which are actuated by the magnet incorporated in the float.
The instrument sensors contain reed contacts which are triggered by the magnetic flowmeter float. GEMU 1270/1271 have a voltage output signal via voltage divider.
GEMU 1272/1273 are equipped with an integrated 2-wire measuring transducer and realize a current output signal.
The limit switches and instrument sensors are fixed to the dovetail sections moulded onto the flowmeter type series GEMU 800 and GEMU 850 (see data sheets 800/850). The float in the flowmeter is equipped with a permanent magnet for this application.
When the magnetic float has passed the contacts fixed to the tube at least once, the following conditions occur:
|Max. contact (GEMU 1251/1256)||closed||open|
|Min. contact (GEMU 1252/1257)||open||closed|
The contacts then remain in this position, even if the float moves a long way from the min. or max. contact and will only change when the float passes the respective contact again.
The reading from the GEMU 1270/1271 instrument sensor is emitted as voltage output signal via a voltage divider (0-10 kΩ). GEMU 1272/1273 produce a current output signal which can be directly processed without any further conversion. The function of the limit switches or instrument sensors is neither affected by the working pressure, nor by the conductivity, concentration or density of the medium. The application of the flowmeters with continuous reading or limit switches together with a measuring transducer is suitable for use with conducting, non-conducting and also with turbid media.
|Type||1250 1251 1252 1256 1257 1270 1271 1272 1273|
|Housing Material||Impact resistant plastic PBTP|
|Electrical Connection||Standard connector supplied with instrument sensor Standard connector supplied with switch|
|Protection Class to EN 60529||IP 65|
|For Flowmeter Type||800 800/850 DN 10-20 800/850 DN 25 850 DN 10-20 850 DN 25|
|Combination within the GEMU modular System||GEMU 1275 GEMU 1284|
Note on Index X
Operation in potentially explosive areas only in conjunction with an isolation switch amplifier complying with ATEX which is designed for operating electro-mechanical switching contacts and for which separate operating instructions apply.
For Flowmeter Type
Number of Switch Points
Distance of Reed Contact
|1250||Change-over Contact||1250||800/850 DN 25||N/A||N/A||N/A||N/A|
|1251||Max. Limit Switches||1251||800/850 DN 25||N/A||N/A||N/A||N/A|
|1252||Min. Limit Switches||1252||800/850 DN 25||N/A||N/A||N/A||N/A|
|1256||Max. Limit Switches||1256||800/850 DN 10-20||N/A||N/A||N/A||N/A|
|1257||Min. Limit Switches||1257||800/850 DN 10-20||N/A||N/A||N/A||N/A|
|1270 000Z2501||Instrument Sensors||1270||800||Without||230 mm||55||4.25|
|1270 000Z2503||Instrument Sensors||1270||800||Without||230 mm||100||2.3|
|1271 000Z10O1||Instrument Sensors||1271||850 DN 10-20||Without||118 mm||35||3.5|
|1271 000Z2501||Instrument Sensors||1271||850 DN 25||Without||147 mm||43||3.5|
|1272 000Z2501||Instrument Sensors||1272||800||With Integrated two wire transducer||210 mm||55||4.25|
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