CEMB USA TR-26 ATEX User Manual

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VIBRATIONS TRANSMITTER mod. Ex TR-26

Function

The integrated transmitter mod. Ex TR-26 measures the Absolute Vibrations of any rotating
machine support and is able to interface itself directly (two-wires technique, current loop 4 to 20
mA) with an acquisition system (PLC or DCS).
The transmitter reduces at maximum installation and wiring incidence, that normally limits the
possibilities to apply the traditional systems for vibration monitoring.

The transmitter is certified for applications in areas classified as:

- Ex II 2 G Ex ia IIC T6 or T5 or T4

General description

The transmitter, assembled through direct fastening on the machinery, generates a current signal (4
to 20 mA) that is proportional respectively to vibration speed or acceleration.
The transmitter is composed of a stainless steel body having a threaded machine connection; the
connection with the users is performed bymeans of a MIL-C-5015 connector (2 poles), included.

NOTE: The transmitter is available in different configurations and becomes operative only after its
correct electrical connection, as per drawing no. 85465-P; it doesn’t need setup or maintenance.

Technical characteristics

Composition

 Integrated transmitter body, in AISI 316L stainless steel material.

Power supply

 24 Vdc (10 to 35 Vdc) current loop 4 to 20 mA (two-wires)
 Maximum load as per figure 2

External connections

 MIL-C-5015, 2 poles connector (conductors max section 2,5 mm²)

Environmental use field

 - 50°C to + 120°C
 IP 65 EN 60529/10.91 standards

Measurement type

 Omnidirectional seismic (absolute vibrations)

Dynamic field

 ± 18 g

Transversal sensitivity

 < 5 %

Linearity

 ± 2% - 75 Hz

Dynamic performances

 ±3% / 10Hz-1kHz (See figure 1)
 -3db / 1.5Hz – 2.5kHz

Insulation

  108 between signal and container

Application axis

 any

Process standard connections

 M8x1,25
 ¼”-18NPT
 ¼’’-28UNF

Maintenance

 none

Electrical connections

 bipolar shielded cable, typical conductors section 2x1mm²

Possible prearrangements to the order

 measuring field
 fastening
 ATEX certification type

Figure 1 – Frequency response [db]

2

Figure 2 – Maximum allowable load on current loop

900

Power supply [V]

800

700

600

500

400

300

Maximum load [Ohm]

200

100

0

0 5 10 15 20 25 30 35

3