Samson 3760 Service manual

Mounting and
Operating Instructions
EB 8385 EN
Edition July 2012
Pneumatic Positioner
Electropneumatic Positioner
Type 3760
Type 3760 Positioner

Contents
1 Design and principle of operation. . . . . . . . . . . . . . . . . . . . 6
2 Attachment to actuators . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Adjusting the operating direction . . . . . . . . . . . . . . . . . . . . 8
2.2 Installing the clamp . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Pneumatic connections . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.1 Signal pressure indication . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.2 Supply pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.3 Degree of protection IP 65 . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.2.1 Switching amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4 Operation – Setting . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Starting point and reference variable . . . . . . . . . . . . . . . . . . 15
4.2 Adjustment for "Actuator stem extends". . . . . . . . . . . . . . . . . 16
4.3 Adjustment for "Actuator stem retracts". . . . . . . . . . . . . . . . . 17
5 Adjusting the limit switch . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Retrofitting a limit switch . . . . . . . . . . . . . . . . . . . . . . . . 18
6 Converting the positioner . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 Conversion from pneumatic p/p to electropneumatic i/p . . . . . . . . 20
6.2 Conversion from electropneumatic i/p to pneumatic p/p . . . . . . . . 21
7 Dimensions in mm. . . . . . . . . . . . . . . . . . . . . . . . . . . 22
2EB 8385 EN
Contents

EB 8385 EN 3
Safety instructions
4The positioner is to be mounted, started up or operated only by trained and
experienced personnel familiar with the product.
According to these Mounting and Operating Instructions, trained personnel re-
fers to individuals who are able to judge the work they are assigned to and
recognize possible dangers due to their specialized training, their knowledge
and experience as well as their knowledge of the applicable standards.
4Explosion-protected versions of this positioner may only be operated by per-
sonnel who have undergone special training or instructions or who are autho-
rized to work on explosion-protected devices in hazardous areas.
4Any hazards that could be caused by the process medium, the operating pres-
sure, the signal pressure or by moving parts of the control valve are to be pre-
vented by means of the appropriate measures. If inadmissible motions or for-
ces are produced in the actuator as a result of the supply pressure, the supply
pressure must be restricted by means of a suitable supply pressure reducing
station.
4Proper shipping and appropriate storage are assumed.
4Note: The device with a CE marking fulfils the requirements of the Directives
94/9/EC (ATEX) and 89/336/EEC (EMC). The declaration of conformity is
available on request.

4EB 8385 EN
Versions
Positioner Type 3760- XXXXXX
Explosion protection Without
II 2G Ex ia IIC T6 acc. to ATEX
CSA/FM
II 3G Ex nA II T6 acc. to ATEX
0
1
3
8
Additional equipment Without
Inductive proximity switches
0
1
Pneumatic connections G 18
18NPT
1
2
Electrical connections Without
M20 x 1.5 blue
M20 x 1.5 black
Connector DIN 43650
0
1
2
3
Reference variable 0.2 to 1 bar/3 to 15 psi
4 to 20 mA with i/p module 6109
0 to 20 mA with i/p module 6112
1 to 5 mA with i/p module 6112
0
1
2
2
0
1
2
3

EB 8385 EN 5
Technical data
Travel range 0 to 5 mm · 0 to 7.7 mm · 0 to 15 mm
(see page 11 for range spring table)
Reference variable pneumatic 0.2 to 1.0 bar (3 to 15 psi)
electric 4 to 20 mA (also 0 to 20 mA with 6112 i/p module) · 1 to 5 mA
Split-range operation
0 to 50 % or
50 to 100 %
with 7.5 and 15 mm travel
Internal resistance at 20 °C
4 to 20 mA: 200 Wfor safe areas · 250 Wfor hazardous areas
0 to 20 mA: 200 W
1 to 5 mA: 850 W
Supply air 1.4 to 6 bar (20 to 90 psi)
Signal pressure 0 to 6 bar (0 to 90 psi)
Characteristic Linear, deviation from terminal-based conformity £1.5 %
Direction of action Reversible
Hysteresis £0.5 %
Sensitivity £0.1 %
Steady-state air consumption £100 ln/h at 0.6 bar signal pressure and supply pressure up to 6 bar
Air output capacity At Dp 1.4 bar: 1600 ln/h · At Dp 6 bar: 5000 ln/h
Transit times with Type 3277 Actuator
(15 mm travel, 0.2 to 1 bar signal
pressure)
120 cm²: £2 s · 240 cm²: £6 s · 350 cm²: £8 s
Permissible ambient temperature
–20 to +70 °C
Down to –30 °C with metal cable gland
Down to –40 °C with metal cable gland and Type 6112 i/p Converter
Limits in test certificates additionally apply for explosion-protected devices.
–40 to +70 °C for Type 3760-00x000 Pneumatic Positioner without inducti-
ve limit switch
Influence
Temperature: zero point: £0.03 %/°C · Span: £0.03 %/°C
Vibrations: between 5 and 120 Hz as well as 2 g £0.5 %
Supply air: £0.6 %/1 bar
Electromagnetic compatibility Requirements specified in EN 61000-6-2, EN 61000-6-3 and EN 61326-1
fulfilled
Variable position when turned 180° < 3.5 %
Degree of protection IP 54 (IP 65 with filter check valve, refer to accessories)
Weight Approx. 0.6 kg
Materials Housing: polyamide · External parts: stainless steel
Additional electrical equipment
Inductive limit switch Type SJ2-SN
Control circuit Values corresponding to downstream switching amplifier
Hysteresis at rated travel £1 %