TABLE OF CONTENTS
Rheonics Teletube
For simplicity of construction of long insertion probes, especially when the insertion length is ultra-long (above 600 mm), Rheonics offers the Teletube Variant for the SRV and SRD. This variant allows the unit to be delivered in smaller parts that are assembled by the user before final installation. Assembly is straightforward and simplified based on threaded joints.
SRV and SRD Teletube probes are used to simplify the assembly and reduce the costs of using a long and ultra-long insertion length.
The Teletube assembly is composed of the parts shown above. At the fluid end, it requires the Teletube version of the SRV or SRD (SRV-TT or SRD-TT). At the other end, it has two variants with a cable gland version (SRx-TT-CAB) and another where the transmitter SME-TR(D) is mounted directly (SRx-TT-TR).
The Teletube variant is defined by the user with the process connection, total length (if needed), and insertion length of the probe.
Figure 1: Rheonics SRV and SRD Teletube with SME-TRD and cable gland end
Common installations of the SRV and SRD Teletube are in tanks, vessels, reactors, or big pipes.
Figure 2: Installation Example of SRV and SRD Teletubes
| For smaller insertion lengths, Rheonics offers the SRV-X5 and SRD-X5, with 30 mm diameter body as the Teletube. Users can define the process connection and insertion length upon order. |
Teletube Sensor Variant - Parts List
The next table details all parts that can be used for the assembly, depending on the Teletube back-end variant, some parts may not be included. Quantities vary depending on the insertion length.
| Part | Quantity | Comment | Images |
| SRV-TT or SRD-TT | 1 | Sensor Probe |  |
| OR-TT | 1 for Sensor 1 for back-end connector 1 for each extension tube | ∅27X1.5 O-ring Select the right material for your process fluid and operational temperature compatibility. |  |
EXT-TT | Defined by insertion length (distance from sensor probe tip to process connection) | Extension tubes: May be one or many. These parts are numbered from 1 to X. The part with the process connection flange is generally the last one. |  |
| AB-TT | 1 | End back adapter Female G3/4" - Female NPT 1/2”. Only for -TT-CAB option. |  |
| CG-TT | 1 | Only for -TT-CAB option (Cable gland for sensor cable) |  |
| AT-TT | 1 | End back adapter Female G3/4" - Male NPT 1/2”. Only for -TT-TR option (Transmitter mount adapter). |  |
The OR-TT is a standard O-Ring that is used for sealing all the G threaded in the Teletube assembly. This is available in various materials from Rheonics and third-party O-ring suppliers. Order the correct O-ring material that is compatible with your process fluid and operational temperature. |
| Follow the specified temperature for your probes as components are only rated for the ordered temperature. The use of probes outside of their specified operational range will result in irreversible damage. |
Assembly Tools
| Tools | Quantity | Comment | Images |
| TOW-M12 | 1 | Torque Wrench for M12 connector |  |
| TLG | 1 | Thread Locker Glue Standard: LOCTITE 242 For High Temperatures: LOCTITE 2422 HI TEMP TL MS 30G |
|
It is recommended to use TLG (Thread Locker Glue) to avoid the threads coming loose. However, when the sensor needs to be disassembled, then you can assemble the Teletube sensor without the TLG and only apply TLG when the permanent configuration is fixed. TLG is reworkable in some cases - check the TLG is appropriate for your use case and process fluid. For sensor rentals the TLG is not included as the installation is intended to be disassembled later. |
Assembly Instructions
| N | Instruction | Drawing | Picture |
| Verify all parts for assembly and tools to be used. | |||
| I. Prepare extension Tubes: If only one extension tube EXT-TT is delivered, no preparation is required, go to step 5. If multiple EXT-TT parts are delivered, follow the next steps. | |||
| 1 | Identify female and male G3/4” thread port of the EXT-TT part. Identify the EXT-TT with flange, this will be the last tube to assemble - not applicable if APC adapter is used. |  |  |
| 2 | Place an O-Ring OR-TT at the male thread port base. |  |   |
| 3 | Apply some of the TLG paste in the male G3/4" threads for secure thread lock. Not applicable for rentals. |  |  |
| 4 | Thread in the G3/4” male and female port until faces get in contact and O-Ring is compressed. Hand tightening is enough. Repeat the process (step 2 to 4) for all EXT-TT delivered in the assigned order. If there is a tube with a process connection, this one will be the last in the assembly. |  |   |
| 5 | Place an OR-TT on the G3/4" male port base of the last EXT-TT. Piece may look different depending on the process connection you ordered. |  |   |
| 6 | Apply some TLG paste in the male G3/4" threads. Not applicable for rentals. |  |  |
| 7 | A. For -TT-CAB Thread in the AB-TT G3/4” female port to the last EXT-TT G3/4” male port. |  |   |
B. For -TT-TR Thread in the AT-TT G3/4” female port to the last EXT-TT G3/4” male port. |  |   | |
| II. Sensor probe and cable | |||
| 8 | Insert the sensor cable through the assembled extension tube. NOTE: If you used the AT-TT part the back-end will look different. |  |   |
| 9 | Place an OR-TT at the base of the G3/4” thread port of the sensor probe SRV-TT or SRD-TT. |  |   |
| 10 | Thread in the sensor cable M12 connector to the M12 port at the sensor probe back end. Use the TOW-M12 tool for a secure connection. |  |    |
| 11 | Apply some TLG paste in the male G3/4" threads of the sensor probe. Not applicable for rentals. |  |  |
| 12 | Thread in the sensor probe G3/4" port into the extension tube assembly. |  |   |
| 13 | A. For -TT-CAB Pass the cable through the CG-TT Cable Gland, add PTFE tape to the thread, and thread it in the AB-TT NPT 1/2” port. Your probe is now ready. Once assembly is installed, connect the sensor cable to the appropriate electronics unit (SME-XXX). Refer to the SME wiring guidelines to connect the sensor cable wires to the appropriate terminal block in the Transmitter. |  |   |
B. For -TT-TR Wire the sensor cable in the SME-TRD or -TR electronics, add PTFE tape to the 1/2” NPT thread, and thread the sensor probe to the SME. Refer to the SME wiring guidelines to connect the sensor cable wires to the appropriate terminal block in the Transmitter. |  |   | |
Assembly Video Tutorial
- Assembly Teletube with Cable Gland video tutorial.
- Assembly Teletube with SME-TR(D) video tutorial.
Teletube Order Code
How to Order Rheonics long insertion viscometer and density meter | |||
 | |||
| 1 | Rheonics SR- Type sensor SRV: Inline Viscometer SRD: Inline Density and Viscosity meter | 4 | Insertion Depth - “A” Defined by client. Distance from sensor connection to sensor tip. Probe wetted zone. |
| 2 | Process Connection Configuration TT: Teletube Assembly | 5 | Process Connection "B" Defined by client. The connection ID must be bigger than 32mm. Ask Rheonics Sales Team for availability of connections. Code is defined by Rheonics. BA20B: Flange ANSI B16.5 2” 300 lb RF B30T: 3” Tri Clamp |
| 3 | Total Length - L Defined by client. Total length of the sensor probe. If not defined, it will be the shorter available based on the Insertion Length A. | 6 | Back End Variant Select between: TR: Adapter for SME -TR or -TRD CAB: Cable gland end |
| The appropriate RFQ page for SRV viscometer or SRD density and viscosity meter should be used to configure other options of the sensor, like viscosity range, calibration accuracy, pressure rating, etc. | |||
Downloads
References[1] Wiring of standard sensor electronics (SME)
[2] How to wire EX - Explosive Proof sensor electronics (SME)
[3] SR- Type Sensor Installation Guidelines
[4] Tank and Recirculation Line Installation