Omega DT-121 Specification

Product specification

Displacement Transmitter Series DT-120

Non-contacting integrated displacement transmitter

Features

• Maximum linear range 2 mm (0.5 - 2.5 mm from target)

• Loop-powered

• Driver electronics are built into the transmitter housing

• Temperature range: -40 °C ... +105 °C.

• Dynamic signal output for easy installation (raw signal)

• Cost-saving installation – no separate driver needed

Measurement

Radial shaft vibration

DT-12x.RV

1

Axial shaft position

DT-12x.AP

1

Product description

The integrated DT-120 series displacement transmitters are based on the non-contacting eddy current measurement principle, which has proven itself in the machine monitoring sector for several decades. It allows the distance between the tip of the displacement transmitter and an electrically conductive surface to be measured. The integrated electronics measure the axial shaft position or the radial shaft vibration from the displacement signal, depending on the model being used. The measurement result is outputted to a subsequent controller, via the loop-powered interface, as a 4 - 20 mA signal. An additional dynamic output provides a diagnostic signal for simple system setup or signal analysis. Our series DT-120 eddy current displacement transmitters are distinguished by their innovative design. All of the measuring electronics and the loop-powered interface are integrated in the transmitter's housing. This considerably simplifies the installation of these systems as compared to those with external driver electronics. The displacement transmitter is available in both forward and reverse mount versions.

Contents

Non-contacting integrated displacement transmitter 1

Features 1 Measurement 1 Product description 1 Technical data 2 Notes on operation 4 Clearances and minimum distances 5 Mechanical versions 6 Displacement transmitter order code 8 Accessories 9 Approval / Declaration of Conformity 10

1

"x" option defines the housing version

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EN

Technical data

The following performance data applies under the following standard conditions, unless stated otherwise: +18 °C to +27 °C ambient temperature, +24 VDC supply voltage, 250 Ω loop resistance, dynamic output not connected, B&K Vibro original reference material, Material-No. 1.7225 (42CrMo4) as per EN10083-3 and as per AISI/SAE 4140, +6 V gap voltage; all components are at operating temperature (approx. 1h).

Measurement type: Radial Vibration (RV) Radial shaft vibration in [μm peak-to-peak] Axial Position (AP) Axial shaft position in [μm]

Measuring principle Eddy current method

Functional characteristics:

Loop output:

Output signal 4 - 20 mA, live-zero Signaling (range overshoot, error) As per NAMUR Recommendation 43 System error < 3,6 mA Full scale range overshoot (RV + AP) 20,5 mA Full scale range undershoot (AP only) 3,8 mA Loop Nominal 250 Ω Maximal depends on the supply voltage V (see Fig. 1) Accuracy 0 °C … + 45 °C ±0,2 % from full scale (FS) Overall operating temperature range ±0,5 % (FS)

Installation Position Transmitter (GAP):

Transmitter must be gapped from target (shaft) between +2V to +18V equal to linear range > 0.5mm to < 2.5mm

Radial shaft vibration (DT-12x.RV):

Full scale range, nominal [µm peak-peak] 0 – 100 | 0 – 250 | 0 – 600 Loop sensitivity, nominal [µm p-p/mA] 6,25 | 15,63 | 37,5 Full scale range, nominal [mils peak-peak] 0 – 4 | 0 – 10 | 0 – 24 Loop sensitivity, nominal [mils p-p/mA] 0,25 | 0,625 | 1,5 Sensitivity accuracy in the temperature range of: 0 °C ... +45 °C ±5 % Overall operating temperature range ±10 % Loop frequency range 5 Hz … 4 kHz Loop refresh time 15 ms

Axial shaft position (DT-12x.AP):

Full scale range, nominal [mm] 0 – 1,2 | 0 – 1,5 Loop sensitivity, nominal [µm/mA] 75,0 | 93,8 Full scale range, nominal [mils] 0 – 50 | 0 – 60 Loop sensitivity, nominal [mils/mA] 3,125 | 3,75 Accuracy Deviation (DSL) from best fit straight line with nominal loop sensitivity in the temperature range of: 0 °C ... +45 °C ±25 µm Overall operating temperature range ±75 µm Loop frequency range DC … 0,8 Hz Loop refresh time 100 ms

resistance

Loop

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Technical data

EN

Dynamic output:

Application Connection of a potential-free portable measuring instrument for system setup or signal analysis; not designed for continuous operation; limited cable length Cable length max. 15 m (including transmitter integrated cable length) Cable capacity max. 150 pF/m Output resistance 8 kΩ DC (load > 500 kΩ, 1,5 nF) Output signal Depends on the loop voltage and loop resistance, see Table 1

Sensitivity, nominal +8 mV/µm

Frequency range DC … 8 kHz (-3 dB output signal damping) Accuracy 0 °C … +45 °C ±5 % Overall operating temperature range ±10 % Behaviour in the event of maximum linear range Output remains active; max. output voltage overshoot or system error depends on loop voltage; short voltage dips at the start of signaling of a measuring range overshoot is possible Design short circuit proof and miswiring proof

Electrical properties:

Operating voltage +24 VDC (+12 VDC ... +32 VDC) Current consumption max. 21 mA

Mechanical properties:

Cable: Design 4 wire Cable sheath and colouring PTFE, black Wire assignments: Loop white (+), black (-) Dynamic output red (+), blue (-) Diameter Ø 2,9 mm (±0,15 mm) Wire cross-section 0,16 mm²

Length 5 m or 10 m

Transmitter tip: Material Ceramic Tip diameter Ø 7,2 mm (± 0,1 mm)

Transmitter sleeve: Material Stainless steel (Material-No.1.4404 X2CrNiMo17-12-2 nach EN10088-3) Recommended tightening torque 5 Nm Transmitter weight (5m version): approx. 150 g

Environment:

Pressure tightness: Transmitter tip 25 bar Transmitter with corrugated tube protection 25 bar (valid only for DT-122) Temperature range: Operating temperature range -40 °C ... +105 °C Storage temperature range -55 °C ... +125 °C IP protection degree according to EN 60529 IP68, IP69

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EN

20 V

1)

24 V

11.4 V

28 V

15.4 V

1250

Loop

Notes on operation

Maximum loop resistance R

Loop-max

The total loop resistance consists of the measuring resistance of the supplying electronics and the effective cable resistance:

Loop

= R

• R

The maximum permissible loop resistance for a given voltage supply V

Meas

+ R

Cable

is calculated using the following

Loop

formula:

• R

Loop-max

= 47 x (V

- 12) [Ohm]

Loop

The diagram shows the relationship between the supply voltage V

and the maximum permitted loop

Loop

resistance.

R-Loop-max

(Ohm)

1000

750

500

250

No operation

Operating area

0

12 16 20 24 28 32 36

Supply voltage V

Figure 1) Dependency of the supply voltage on the maximum loop resistance

(Volt)

Range of the maximum dynamic output signal

The output of the diagnostic signal via the dynamic output DYN_OUT requires a sufficiently high supply voltage

for a given loop resistance R

V

Loop

DYN_OUT < V

Table 1) shows the relationships between the maximum outputted DYN_OUT and R

R

V

Loop

Table 1) DYN_OUT

1) No operation possible

2) Voltages higher than 21.4 V cannot be outputted.

100 Ω 250 Ω 500 Ω

15.4 V 12.4 V

19.4 V 16.4 V

21.4 V2) 20.4 V

(R

Loop

, V

Max

In case of insufficient supply voltage V

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Loop

:

– I

Loop

x R

– 2.6 V

Loop

and V

Loop

)

, the DYN_OUT dynamic output signal range might be limited.

Loop

Distance to the shaft

Required minimum shaft

Transmitters installed

Transmitter Series DT-120

Clearances and minimum distances

EN

Clearances and minimum distances

The clearances and minimum distances specified below must be observed when installing the transmitter.

Protruding transmitter tip

shoulder Transmitter parallel to electrically conductive material

Flush transmitter tip

Distance to a shaft end

Distance to the shaft shoulder Transmitter parallel to electrically conductive material

diameter for one transmitter

Required minimum shaft diameter with two transmitters

in parallel

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EN

Mechanical versions2

Displacement transmitter with continuous thread DT-121...

• Without cable protection: DT-121.MT/MR/TT/LLL/UUU/PPP/000/R (upper image)

• With steel protective conduit, Length XX: DT-121.MT/MR/TT/LLL/UUU/PPP/2XX/R (centre image)

• With PTFE protective conduit, Length XX: DT-121.MT/MR/TT/LLL/UUU/PPP/3XX/R (lower image)

Displacement transmitter with continuous thread and pressure-tight corrugated tube DT-122…

• With corrugated tube protection design A, Length XX: DT-122.MT/MR/TT/LLL/UUU/PPP/4XX/R

(upper image)

• With corrugated tube protection design B, Length XX:

(lower image)

2

Comments about drawings: all information is in [mm]

DT-122.MT/MR/TT/LLL/UUU/PPP/5XX/R

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EN

Displacement transmitter for reverse mount DT-123...

• Without cable protection DT-123.MT/MR/TT/073/013/PPP/000/R (upper image)

• With steel protective conduit, Length XX: DT-123.MT/MR/TT/073/013/PPP/2XX/R (centre image)

• With PTFE protective conduit, Length XX: DT-123.MT/MR/TT/073/013/PPP/3XX/R (lower image)

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EN

“D” transmitter type

D

Continuous thread with corrugated tube



2

Reverse mount

 3

“MT” Measurment type

.MT

RV

AP

“MR” Measuring Range

/ MR

0

1

2

5

6

7

“T” Thread

/ TT

10

3/8 – 24 UNF-2A



62

“L” Length of the transmitter body [mm]

Increment 005 = 5 mm

Displacement transmitter order code

DT–12D.MT / MR / TT / LLL / UUU / PPP / CXX / R

DT-121 DT-122 DT-123 DT-12…

Continuous thread

Radial shaft vibration (RV)

Axial shaft position (AP)

RV [µm] / AP [mm]

RV [mils] / AP [mils]

M10 x 1



250 1.5

600

10 60

24

1



100 1.2

4 50

 



Preferred lengths

Fixed length 73 073

Other lengths min - max 75 - 250 75 - 250 xxx

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/ LLL

75 75 075

90 90 090

105 105 105

125 125 125

Preferred length

15

15 015

Fixed length

13

013

Other lengths min - max

20 - 210

XXX

/ R

Transmitter Series DT-120

“U” unthreaded section [mm]

U

= L – 40 mm ; increment ‘005’ = 5 mm (as from “U” = 15 mm)

max

Distance measured from tip of transmitter to non-threaded section

DT-121 DT-122 DT-123 DT-12…

Accessories

/ UUU

EN

“P” Length of the integrated cable [dm]

5.0 5.0 5.0 050

10.0 10.0 10.0 100

“CXX” Cable protection for integrated cable [dm]

The minimum length is ‘05’ = 0,5 m with fixed increments of 0.1 m. CXX = ‘000’ means "no protection" and XX = ‘99’ for maximum possible cable

protection for the transmitter version (the protection ends approx. 0.4 m from the end of the cable).

No protection

Steel protective conduit

PTFE protective conduit

Corrugated tube protection, design A

Corrugated tube protection, design B

“R” Special requirements

No

Yes (need to be put in writing)



  



Upon request



/ PPP

/ CXX

000

2XX

3XX

4XX

5XX

0

1

Accessories

AC-2140: two channel connection module

We reserve the right to make technical changes!

EN

Order example

Approval / Declaration of Conformity

Displacement transmitter systems are:

CE Conformity as per EMC Directive EN 61326-1: 2013 EN 50581: 2012

RCM for Australia and New Zeeland

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Approval / Declaration of Conformity

EN

We reserve the right to make technical changes!

Contact details

Brüel & Kjaer Vibro GmbH

Leydheckerstrasse 10 64293 Darmstadt Germany Telephone: +49 6151 428 0 Fax: +49 6151 428 1000