SGE985 Limit Switch

Description

The SGE985 Limit Switch serves as end position signaling of actuators and can be mounted to stroke actuators as well as to rotary actuators. It is constructed with inductive sensors or micro switches and signalizes exceeding or declining of two adjustable positions.

FEATURES

Inductive limit switch according to DIN 19 234 rsp. NAMUR or three-wire system
Variable switching functions
Precise switching points through adjustable transmission
The switches can be set precisely, even with very small strokes – independently one of the other
Designed for stroke valves
Specially suitable for small strokes by using a movement amplification mechanism
Robust design; low vibration effect in all directions
Mounting according to DIN IEC 534 part 6 (NAMUR)
Rotation adapter for angles up to 120 °
Explosion protection: II 2 G Ex ib/ia IIB/IIC T4/T6 according to ATEX, class I, zone 0 or 1, groups IIC, IIB, IIA class I, division 1, groups A, B, C, D, acc. to CSA; Explosion protection according to CU TR
EMC in accordance with international standards and laws (CE)

TECHNICAL DATA

Input

Stroke	up to 100 mm with standard attachment kit for diaphragm actuators; for larger stroke please consult us
Rotary angle	up to 120 °with attachment kit for rotary actuators

Output Inductive Limit Switch, two-wire system Code S, T

Output

2 inductive proximity sensors acc. to DIN 19 234 resp. NAMUR for connection to a switching amplifier with intrinsically safe control circuit 1) 2) 3) Code S . . Sensors SJ3.5-N from Pepperl+Fuchs Code T . . Sensors SJ3.5-SN from Pepperl+Fuchs Code T + ECEP EP0094 . . Sensors SJ3.5-S1N from Pepperl+Fuchs

Current consumption

Vane clear	> 3 mA
Vane interposed	< 1 mA

For control circuit with the following electrical values

Supply voltage	DC 8 V, Ri approx. 1 kΩ
Residual ripple	< 5 %
internal inductance	160 µH
internal capacitance	20 nF
Perm. line resistance	< 100 Ω
Switching differential	< 1 %

Output Inductive limit switch, three-wire system Code U

Output	2 inductive proximity sensors, three-wire system, contact, PNP 2) 4), LED indication Code T . . Sensors SB3.5-E2 from Pepperl+Fuchs
Supply voltage U_S	DC 10 to 30 V
Residual ripples	± 10 %, US = 30 V
Switching frequency	2 kHz
Constant current	100 mA
Switching differential	< 1 %

Output Limit switch assy. with micro switches Code V

Output	2 micro switches
Code V	Switch V4NT7UL from Saia Burgess

Connected load, alternating current

Switching capacity	max. 250 VA
Switching voltage	max. 50 V
Switching current with
Ohmic resistance	max. 5 A
inductive resistance	max. 2 A
Bulb, metal filament	max. 0.5 A

Connected load, direct current

Switching voltage	Ohmic load	Inductive load
max. 30 V max. 50 V	max. 5 A max. 1 A	max. 3 A max. 1 A

Switching differential

< 2.5 %

Response characteristic

Gain	continuously adjustable from 1:1 to approx. 7:1
Switching point repeatrability	< 0.2 %

Ambient conditions

Temperature

Code S	–25 to 85 °C / –13 to 185 °F
Code T	–40 to 85 °C / –40 to 185 °F
Code T with EAC Cert	–60 to 85 °C / –76 to 185 °F
Code U	–25 to 70 °C / –13 to 158 °F
Code V	–40 to 85 °C / –40 to 185 °F
Relative humidity	up to 100 %

Transport and storage Temperature	–40 to 85 °C / –40 to 185 °F
with EAC Cert	–60 to 85 °C / –76 to 185 °F
Protection class	IP 65

The device can be operated at a class D1 location according to DIN IEC 654, part 1

MountingFor attaching to diaphragm actuators acc. to DIN IEC 534-6 (NAMUR) and to rotary actuators acc. to VDI/VDE 3845

Mounting orientation

any

Electric connection

Line entry	1 cable gland M20x1.5 (others with Adapter AD-...)
Cable diameter	6 to 12 mm (0.24 to 0.47 in)
Screw terminals	Screw terminals for wires up to 2.5 mm2 (AWG 14)

Materials

Housing and cover	Aluminium (Alloy No. 230) finished with DD varnish
Control vanes	Aluminium
Setting mechanism	Fiber glass reinforced polyamide
Transmission shaft	1.4571
Mounting bracket	1.4301

Weight

SGE985

approx. 0.6 kg (1.3 lbs)

SAFETY REGULATIONS

ATEX Explosion protection

Inductive proximity sensor	Type SJ 3,5-N resp. Type SJ 3,5-SN (security version)
Type of protection	II 2 G Ex ib/ia IIB/IIC T4/T6
Certificate of conformity	PTB 02 ATEX 2153 (Option Limit switch)

For operation in certified intrinsically safe circuits with the following maximum values:

U_max	16 V
I_max	25 mA
P_max	64 mW
Internal inductance	100 µH
Internal capacitance	30 nF

The certificate of conformity refers to the inductive sensor installed. Mounting conforms to the stipulations of the certificate and the mounting conditions.

CSA Explosion protection

Class I, zone 0 or 1, groups IIC, IIB, IIA
Class I, division 1, groups A, B, C, D, acc. to CSA

CE Marking

Electromagnetic compatibility 2004/108/EC

Low voltage regulations

w/o Ex: 73/23/EWG fulfilled (with Ex: not applicable)

Electromagnetic compatibility EMC

Operating conditions

Industrial environment

Immunity according to

NAMUR recommendation NE21	fulfilled
EN 61 326	fulfilled
EN 61 000-6-2	fulfilled

Emission according to

EN 55 011, Group 1, Class A	fulfilled
EN 61 000-6-2	fulfilled

Safety requirements

Safety	Safety class III
as per DIN EN 61010-1 (DIN IEC 61010-1) (VDE 0411 part 1) Overvoltage category	1
Infernal fuses	None
External fuses	Limitation of power supplies for fire protection has to be observed due to EN 61010-1 9.3. ff.

SWITCHING FUNCTIONS

The switching functions may be freely selected and set. The control vanes may be adjusted as desired in order to reach the wanted switching behavior. The illustration here shows the four basic settings and adjacent the respective switch behavior (gray = immersed vane).

The examples are based on the following setting: Mounting left = feedback level right; transmission is selected so that at stroke x from 0 to 100 % the guidance shaft travels through a rotary angle of 180°. Illustrated in resting position x = 0%

2-wire technique: If control vane is immersed the initiator power circuit becomes high-ohmic

3-wire technique: If control vane is immersed the contact is closed against plus.

Micro switch: Contact opens during passing of the control vanes.

SGE985 Switching Functions