Which Products are Involved?

SRV, SRD, DVM, DVP, SME-TR/TRD.

For SME-TR/TRD (Outdoor Mount) transmitter. Visit our product page to learn more about the full features.

Visit Rheonics product page: Products » inline fluid viscometer and density meter 


What is the purpose of this article?

To give guidance and highlight good practices when preparing Rheonics sensor cables with a crimp of length 8mm and terminal diameter 1mm. The terminals of the SME-TR/TRD are rated for wires of 0.2 - 1.5 mm2 i.e. AWG 24 - 16.

1. Tools and BoM list

Tools

  •  Crimping Tool

Crimping tools are used to deform materials and create connections. To connect wires together or to other connectors, crimping is commonly used in electrical work.

Figure 1. Crimping Tool - 24-10 AWG.[1]

  •  Precision Micro Wire Cutter

A wire cutter or cable cutter is a tool that cut wires and cables in a safe manner without damaging the insulation or conductors.

Figure 2. Precision Micro Wire Cutter. [2]

  •  Measuring Tape

A Measure Tape is a tool used to measure length.

Figure 3. Measuring Tape.[3]

  •  Stripping tool

Wire strippers are portable handheld tools used by workers, especially electricians, to remove the protective coating of electric wires for replacement or repair.

Figure 4. Stripping tool.[4]

  •  Knife

Tool used to cut wires or cables.

Figure 5. Knife. [5]

 

  •  Soldering Equipment

A durable, permanent connection can be created by joining conductive metal elements with solder. Soldering machines are essential tools for building, modifying, and repairing electronics.

Figure 6. Soldering Equipment.[6]

  •  Hot air gun

Heat guns are devices that emit a jet of compressed air toward a particular point or surface.

Figure 7. Hot air gun.[7]

BoM list

Item name

Manufacturer name 

Manufacturer Part Number

Vendor Part number

Examples

Ferrule

RND

RND 465-00566

301-10-345

https://www.distrelec.ch/

Solder wire

RS PRO

800-7661

800-7661

Industrial Solutions | RS formerly known as RS Components 

Heat Shrink tube

HellermannTyton

380-03005

711-4783

Industrial Solutions | RS formerly known as RS Components 

Eyelet

Vogt

2007.68

300-73-088

https://www.distrelec.ch/

Cable gland

JACOB® PERFECT

BN 22155

3692903

Bossard Group - Fasteners, Engineering, Logistics 

  • Ferrule

Correct ferrule size must be selected based on the gauge of the wire, as a standard Rheonics uses ferrule with a pin length of 8mm and diameter of 1mm.

Figure 8. 22 AWG (8mm Pin) Insulated Ferrules. [8]

  •  Solder wire

Solder wires are wires with a low melting point, used to create joints using a soldering iron.

Figure 9. Solder wire.[9]

  •  Heat shrink tube

Heat shrink tubing is a common element in most electrical installations that protects wires from moisture, dust, abrasion, and sharp objects that might otherwise damage them.

Figure 10. Hear shrink tube[10]

  • Cable gland


Figure 11. Cable gland.[11]


2. Cable Lenght

Required tools:

  1. Knife

  2. Measurement tape

  • Take the cable and cut the required length for your application by measuring with tape. We recommend stripping out the cable sheath at 18 cm (7 inches) from the end as a suitable length to prepare the cables for attachment to SME-TR/TRD.

 Figure 12. Cutting cable to the correct length.

3.Cable Strip

Requirements:

  1. Knife

  • Strip out the sheath with the help of the cutter and a previous cut.


Figure 13. Strip cable sheath.


4. Cutting´s cable shield

Requirements:

  1. Knife

  2. Cutter

  • Loosen the metal shield from the black cable cover and cut it out.


Figure 14. Removing the cable shielding to get access to the internal wires.

5. Cable gland installation


Requirement:

  1. Cable gland

  • Take the cable gland and open it up into 3 parts as shown below – Part 1(Cap), Part 2(Cable holding part with packing), and Part 3(Body).  


Figure 15. Cable gland-all pieces.

  • Pass Part 1 and Part 2 through the cable as shown. 


Figure 16. Sensor cable passing through the cable gland.

  • Open up the metal shield and cut it a bit shorter. 


Figure 17. Cleaning shield remnants.

  • Fold the metal shield back on the plastic insert(part-2) . That way the metal shield makes electrical contact with the cable gland and this is the grounding for the TR/TRD case.


Figure 18. Cable shield is folded back into the plastic part.

  • Make sure that the shield is in contact with the cable gland.

Figure 19. The cable shield is in full contact with the cable gland.

  • Press Part 3 onto Part 2 and rotate it so it goes all the way to the end.



Figure 20. The cable gland body is inserted through a sensor cable.

  • Take Part 1 and tighten over Part 3. Part 2 is completely enclosed by Part 1 and Part 3. 


Figure 21. The cable gland is fully assembled.

It is important that the metal shield from the cable is in contact with the cable gland so the electronics housing is connected to the sensor cable shield like in figure 20.

Figure 22. The cable shield is in contact with the cable gland[12]
6. Stripping the wire ends

Requirement:

  1. Cable stripper

  • Stripping the wire at 9mm from the end with the stripping tool.


Figure 23. Stripping wire end.
7. Properly usage of crimpers

Requirement:

  1. Crimping tool

Your crimping tool should have a nest for inserting the terminal. After inserting in the correct slot, squeeze the crimp tool firmly and release it to get a long-lasting, tight fuse. 

Unused wires should be neither stripped nor crimped. We recommend protecting the ends with a shrink tube to avoid the ends making any electrical contacts.

We recommend crimping the ferrules on two sides instead of 4 sides as they work better with the terminals on the SME.

  • Twist the wire and Crimp them (Crimpers) using the Crimping Tool.


Figure 24. Crimping the wire end.

  • Final results after crimping all wires from the sensor cable.


Figure 25. Crimped wires.

8. Grounding of the SME TR/TRD

The grounding in the SME TR/TRD is achieved with the ground lug shown in figure 26. 

Figure 26. SME-TRD