T 4749 ENType 4749 Position Transmitter

Application
Position transmitter with magnetoresistive measuring system in type of protection Ex d (flameproof enclosure) or Ex i(intrinsic safety) for attachment to pneumatic linear actuators or rotary actuators according to VDI/VDE 3845

The SAMSON Type 4749 Position Transmitter is mounted onto
control valves and converts the linear or rotary motion of acontrol valve into a 4 to 20 mA standardized signal.
Special features• Mounting kits for linear actuators according toIEC 60534-6-1, rotary actuators with interface according
to VDI/VDE 3845 or SAMSON direct attachment• Electrical connection using M20x1.5 or ½ NPT cablegland to terminals• Easy menu-driven operation using two pushbuttons andtwo LEDs
• Corrosion-resistant, rugged enclosure with degree ofprotection IP66 for adverse environmental conditions• Permissible ambient temperature –40 to +85 °C(standard)

Fig. 1: Type 4749 Position Transmitter

SAMSON AKTIENGESELLSCHAFT · Weismüllerstraße 3 · 60314 Frankfurt am Main, Germany
Phone: +49 69 4009-0 · Fax: +49 69 4009-1507 · samson@samsongroup.com · www.samsongroup.com

Edition March 2023

Design and principle of operation
The Type 4749 Position Transmitter converts the linear or rotary motion of a control valve into an electric 4 to 20 mA standardized signal. The angle of the position transmitter's axis ismeasured by the magnetoresistive measuring system and converted into an electric signal.
Attachment

1

The position transmitter is suitable for the following types ofattachment:–

Direct attachment to SAMSON Type 3277 Actuator–

Attachment to actuators according to IEC 60534-6(NAMUR rib)–

Attachment to Type 3510 Micro-flow Valve–Attachment to rotary actuators according to VDI/VDE 3845

Operation
Two pushbuttons are used to operate the device and changedevice settings. Two LEDs (red and green) indicate the menu
items and settings.

23To operate the position transmitter, a transmitter supply
voltage of UB = 12 to 36 V is required for the 4 to 20 mA
measuring circuit.
45Dimensions in mm

867+–

940

94

77

101234567891099

3080

Enclosure cover
Stop screw
Grounding connection (external)
 key keyRed LED
Green LEDTerminal
Grounding connection (internal)
Shaft locking

Fig. 2: Design and operating controlsof the Type 4749 Position Transmitter

2T 4749 ENTechnical data
Type 4749 Position Transmitter
Measuring range
Measurement method

Magnetoresistive measuring system

Measured travel for

Direct attachment to Type 3277:
3.6 to 30 mm
Attachment according to IEC 60534-6 (NAMUR): 5 to 300 mm
Attachment to rotary actuators:
24 to 100°

Power supply
Input voltage

12 to 36 V DC

Output4 to 20 mA · Two-wire device, reverse polarity protection

Residual current≤3.6 mA

Permissible load RB in Ω

RB = (UB – 12 V)/0.020 A

Static destruction limit

38 V DC, 30 V AC

Power consumption<0.2 W

Measuring accuracy
Reference conditions

Calibrated with U = 24 V DC, TU = 20 °C

Zero error<0.1 % according to DIN EN 60770

Hysteresis≤0.1 % according to DIN EN 60770

Nonlinearity<0.3 % according to DIN EN 60770

Effect of supply voltage on zero and span

<0.05 % according to DIN EN 60770

Effect of ambient temperature on zero andspan<0.1 %/10 K according to DIN EN 60770

Long-term stability<0.1 % according to DIN EN 60770

Start-up time

1200 ms

Output rate

1 ms

Environmental conditions and permissible temperatures
Permissible environmental conditions according to EN 60721-3
Storage

1K6 (relative humidity ≤95 %)Transport

2K4Operation

4K2 or 4K3 (depending on the temperature range)–20 to +85 °C:
All versions–40 to +85 °C:
With metal cable glands
Observe the limits in the test certificate for explosion-protected versions.

Resistance to vibration
Vibrations (sinusoidal)

According to DIN EN 60068-2-6:
2 to 9 Hz; 3.5 mm amplitude
10 to 200 Hz; 10 m/s² acceleration
200 to 500 Hz; 15 m/s² acceleration

Noise

According to DIN EN 60068-2-64:
10 to 200 Hz; amplitude 1 (m/s²)²/Hz
200 to 2000 Hz; amplitude 0.3 (m/s²)²/Hz

Requirements
EMC

Complying with EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4, EN 61000-6-7, EN 61326 andNAMUR Recommendation NE 21

Degree of protection

IP 66

Conformity
Electrical connections
Cable glands

M20x1.5 or ½ NPT

Terminals

Screw terminals for 0.2 to 2.5 mm² wire cross-section

Explosion protection
ATEX, IECEx

Refer to Summary of explosion protection approvals on page 4Materials
Enclosure and coverDie-cast aluminum EN AC-44300/EN AC-43000 according to DIN EN 1706, chromate and powder coating

Cable glands

Polyamide, nickel-plated brass

Other external parts

Stainless steel 1.4301/1.4310 + 1.4404/1.4409 (316 L)

Weight0.7 kg

T 4749 EN

3

Article codePosition transmitter

Type 4749-xxxx0xxxx

Without

00/1

SIL

1

300xxxx

991.00.02

981.00.04

97VersionAnalog position transmitter

0Explosion protectionWithout

000ATEXII 2 G Ex ia IIC T6...T4 Gb/II 2 D Ex ia IIIC T85 °C Db

110IECEx

Ex ia IIC T6...T4 Gb/Ex ia IIIC T85 °C Db

111ATEXII 2 G Ex ia IIC T6...T4 Gb/II 2 D Ex ia IIIC T85 °C Db
or
II 2 G Ex db IIC T6…T4 Gb/II 2 D Ex tb IIIC T80 °C Db

180IECEx

Ex ia IIC T6…T4 Gb/Ex ia IIIC T85 °C Db
orEx db IIC T6…T4 Gb/Ex tb IIIC T80 °C Db

181ATEXII 2 G Ex db IIC T6...T4 Gb/II 2 D Ex tb IIIC T80 °C Db

2

10IECExEx db IIC T6...T4 Gb/Ex tb IIIC T80 °C Db

2

1

1

Electrical threaded connections
M20x1.5

0

½ NPT

1

Enclosure material
Aluminum (standard)0

Special applications

Temperature range–20 to +85 °C (standard)

0–40 to +85 °C (versions with metal cable glands)

1–35 to +75 °C (SIL version with metal cable gland)3

Hardware version
1.00.00
Firmware version

Summary of explosion protection approvals
Certification

4749-1104749-111

EC type examination certificate
IECEx4749-1804749-181

EC type examination certificate

IECEx

4749-210
4749-211

EC type examination certificate
IECEx

Specifications subject to change without noticeType of protection
Number

KIWA 18ATEX0031 X

Date

2019-01-09

NumberIECEx KIWA 18.0014X

Date

2019-01-09

Number

KIWA 19ATEX0038 X

Date

2019-10-10

NumberIECEx KIWA 19.0022X

Date

2019-10-10

Number

KIWA 18ATEX0036 X

Date

2018-11-11

NumberIECEx KIWA 18.0017X

Date

2018-11-11

II 2 G Ex ia IIC T6...T4 Gb/
II 2 D Ex ia IIIC T85 °C Db
Ex ia IIC T6...T4 Gb/
Ex ia IIIC T85 °C DbII 2 G Ex ia IIC T6…T4 Gb
II 2 D Ex ia IIIC T85 °C Db
or
II 2 G Ex db IIC T6…T4 Gb
II 2 D Ex tb IIIC T80 °C Db
Ex ia IIC T6…T4 Gb
Ex ia IIIC T85 °C Db
orEx db IIC T6…T4 Gb
Ex tb IIIC T80 °C Db
II 2 G Ex db IIC T6...T4 Gb/
II 2 D Ex tb IIIC T80 °C Db
Ex db IIC T6...T4 Gb/
Ex tb IIIC T80 °C Db

T 4749 EN

2023-04-11 · English

Type