What products are involved?
Rheonics Inline Viscometer SRV and Density and Viscosity meter SRD.What is the purpose of this article?
To give an overview of the Teletube version of the SRV and SRD sensor and installation information.1. Overview
Rheonics viscometer SRV and density meter and viscometer SRD sensors have a Teletube variant. The Teletube is a long insertion probe based on a short probe and extension tubes that are easily assembled on-site by the final user without weldings. This allows for a customizable insertion and total length of the probe, easier delivery and handling of the probe. Learn how to assemble the SR-Teletube here.
This variant is convenient mostly in applications that require an ultra-long (longer than 600 mm) insertion depth, since the sensor probe can be delivered in smaller parts that the user can easily assemble. Probe assembly can be fixed using a thread locker glue or planned for later disassembly. The Teletube variant is also useful for early tests with smaller insertion lengths.
The Teletube assembly is composed of the parts shown below. At the fluid end, it requires the Teletube probe version of the SRV or SRD (SRV-TT or SRD-TT). At the other end, it has two end-variants, the cable gland end (SRx-TT-CAB) and the SME TR(D) end (SRx-TT-TR) in which the sensor electronics are mounted on the probe.
Figure 1. Teletube Type-SR sensor probe assembly parts
For the SRV and SRD Teletube variants, the user should define the process connection, total length (optional), and insertion length of the probe.
| The Teletube variant can be complemented with the APC accessory, which enables a flexible process connection and insertion length. See more in the sections below or visit the APC page here. |
Figure 2. Type-SR sensor dimensions
| Specifications | |
| Sensor compatibility | Viscometer SRV and Density and Viscosity meter SRD |
| Order code | SRV-TT and SRD-TT |
| Insertion length A | Customizable (min. 80mm) |
| Connection type B | Customizable (ID at least 30mm) |
| Drawings | SR- Teletube Drawing |
With the SR- Teletube there are many installation advantages. Some installation scenarios of this sensor variant are:
- Simplify the assembly and reduce the costs of using an ultra-long insertion length.
- Installation in big reactors, tanks, or pipes.
- The Probe length can be easily modified to adjust the probe to different applications.
2. When to use the long insertion -X5 version of the probe and when to select the Teletube version?
Property | -X5 Probe | -TT probe |
| Maximum Pressure | 100 bar (1500 psi) | Low Pressure |
| Maximum Temperature | Above 200 °C (400 °F) | Low Temperature |
| Probe length and Insertion length | Maximum length 1 meter. | Suitable for installations longer than 500 mm. |
| Process connections | Any and hygienic versions available. | Not suitable for hygienic applications. |
| Assembly | Single body probe which is ready for installation. | This probe has to be assembled by the customer. O-rings are required for the threaded joints. |
| Customization | Customizable but not variable after order. | Customizable and variable* after order. |
* When the sensor needs to be disassembled, then you can assemble the Teletube sensor without the TLG, and only apply TLG when permanent configuration is fixed. TLG is reworkable in some cases - check the TLG is appropriate for your use case and process fluid.
3. Installation principles
The Rheonics SR-TT probes require the next installation criteria to be followed to ensure accurate, repeatable, and reproducible viscosity and/or density readings.
Figure 3. Teletube Type-SR sensor probe sensing area
4. Configuration examples
Some examples of possible configurations for the SRV and SRD Teletube variants sensor are shown below:
| The customer has to specify the process connection (Norm and Size), for the order code prefix B can be defined as BXXX and Rheonics will define that in the order. |
1.25” NPT Thread: NPT stands for National Pipe Thread, a standard from North America used for tapered threads that are used in our Rheonics Type-SR sensor probes. There are different NPT thread sizes like 3/4”, 1/2”, 1”, 1 1/4”, etc. The Teletube probes are compatible with NPT 1.25” and bigger sizes. Using an SR-TT probe allows a longer customizable length as in the next figure which uses an NPT 1.25”. Process connection code for this thread size is -B1N25.
| Other thread norms like M, G, and PG are compatible with the Teletube probe variant as long as the minimum ID is 30 mm |
Figure 4. SRV-TT 1.25” NPT. Drawing units: mm [in]
SRV TT A: 264mm B: 1.25” NPT SRV Teletube 1.25” NPT | |||
| Part | Order Code | Drawing | CAD Model |
| SRV Viscometer | SRV-TT-L369-A264-B1N25-CAB L : Total length of the probe, eg. 369 mm in the order code above. A : Insertion length, eg. 264 mm. B : Process connection type, norm, and size, eg. 1.25” NPT in the order code above. | ||
Flanges: This connection has different norms available, depending on the region, like ANSI/ASME B16.5, DIN 2527, JIS B2220, and BS/EN1092. The user should define the norm, size, and all relevant information to specify the flange required. The next example shows a 150lb - 2” flange ANSI/ASME B16.5. Process connection code is BA20A.
Figure 5. SRD-TT Flange BA20A. Drawing units: mm [in]
SRV TT A: 237mm B: Flange B16.5 - 2” SRV Teletube Flange B16.5 - 2” | |||
| Part | Order Code | Drawing | CAD Model |
| SRV Viscometer | SRV-TT-L363-A237-BA20A-CAB L : Total length of the probe, eg. 363 mm in the order code above. A : Insertion length, eg. 237 mm. B : Process connection type, norm, and size, eg. Flange B16.5 - 2” in the order code above. | ||
Tri-Clamp D50.5: Tri-Clamp is used in hygienic installations for food, pharmaceutical, and other industries. The SRV Teletube probes can be ordered with Tri-Clamp sizes from ∅50.5 mm (equivalent to ISO 1127 DN32) and up. The next example shows a Tri-Clamp ∅64 mm (2”) process connection code for it is: -B20T. You can learn more about TC compatibility here.
Figure 6. SRV-TT Tri-Clamp 2” - D64 mm [in]
SRV TT A: 242mm B: Tri-Clamp 2” - D64 SRV Teletube Tri-Clamp 2” - D64 | |||
| Part | Order Code | Drawing | CAD Model |
| SRV Viscometer | SRV-TT-L369-A242-B20T-CAB L : Total length of the probe, eg. 369 mm in the order code above. A : Insertion length, eg. 242 mm. B : Process connection type, norm, and size, eg. Tri-Clamp 2" in the order code above. | ||
Adaptable Process Connector (APC): The SR-TT with the APC process connection is the best choice to make the installation fully customizable. The APC is a process connection system that allows to place a flange on the probe and move it along the shaft to suit different application needs. Teletube allows the change of the probe length easily and the APC can change the insertion length to suit the customer installation. The APC also allows different interchangeable process connections (e.g. flange, tri-clamp) as long as the thickness of the connections is less than 1”. You can learn more about the APC here, and see an assembly’s example below.
Figure 7. SRV-TT with an Adaptable process connector and Tri- Clamp
SRV TT A: XXX mm with the APC SRV Teletube Tri-Clamp 2” - D64 | |
| Part | Order Code |
| SRV Viscometer | SRV-TT-L369-AXXX-BAPC-CAB L : Total length of the probe, eg. 369 mm in the order code above. A : Insertion length, eg. XXX mm. B : Process connection type, norm, and size, eg. Adaptable process connection and Tri-Clamp 2” in the order code above. |
5. Installation examples
Installation in Tank: The common installation of the SR-TT is in a big tank due to the necessary insertion length to have the sensing element fully submerged in the fluid and ensure the highest accuracy on the readings. The next example uses a Flange B16.5 - 2” connection at the top and the side of the tank.
Figure 8. Installation Example of SRV and SRD Teletube probes
5. How to order the Rheonics Teletube Probe?
How to Order Rheonics ultra-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. Connection ID must be bigger than 32mm. Ask Rheonics Sales Team for availability of connections. Rheonics define code. 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. | |||
References
[1] Wiring of standard sensor electronics (SME)
[2] Ultra-long insertion sensor type SR-TT assembly instructions
[3] How to wire EX - Explosive Proof sensor electronics (SME)
[4] SR- Type Sensor Installation Guidelines
[5] Tank and Recirculation Line Installation