What is the purpose of this article?
This article introduces the TMA-TT tank mount accessory for Rheonics Type-SR Teletube (X8) probe variants, with reference to compatible sensor configurations and relevant installation considerations.

What products are involved?
Rheonics Inline Viscometer SRV and Density and Viscosity meter SRD 

TABLE OF CONTENTS

• Introduction
• TMA-TT: Tank Mount Adapter for -TT coded probes
• Compatible Probes
• Assembly parts

Introduction

Rheonics Type-SR sensors — comprising the SRV inline viscometer and the SRD inline density and viscosity meter — are designed for installation in both pipelines and tanks, enabling real-time fluid monitoring and process control.

A range of mounting accessories is available to accommodate diverse installation requirements, including deployment in open tank environments. The TMA-TT is the designated accessory for open-tank installations. Although extended-insertion probe variants are available (SRV-X5, SRV-X8, SRD-X5, SRD-X8), the TMA-TT enables the use of a compact, standard-length probe in conjunction with a commercially available tube to achieve the required insertion depth. This approach offers advantages in terms of configuration flexibility, lead time, and overall cost.

Note: Rheonics TMA-TT is replacing former TMA-34N.

TMA-TT: Tank Mount Adapter for -TT coded probes

Figure 1: SRV probe in TMA-TT

Figure 2: SRD probe in TMA-TT

The TMA-TT is a tank mount adapter compatible with all SRV and SRD sensor probes equipped with a G¾" rear thread (designated by the -TT suffix). This rear thread provides the mechanical interface between the probe and the adapter, sealed by an O-Ring of 26×1.5 mm. The TMA-TT is the recommended solution for adapting a standard or short-insertion probe into a long-insertion assembly suitable for open-tank applications.

Technical Specifications:

• Material: Stainless Steel 316L
• Sealing: O-Ring ∅26×1.5 mm (FKM standard; FFKM available)
• Protection bars (TMA-TT-SPS) secured with M4×8 mm screws
• Maximum operating temperature: Governed by the rated limits of the probe and O-Ring materials
• Process connection: G¾" rear thread
• Process connection adapters: AT-TT (½" NPT male), AB-TT (½" NPT female).

The AT-TT and AB-TT accessories allow customers to connect a standard off-the-shelf tube — threaded with either a ½" NPT female or male end — directly to the TMA-TT, achieving the required total insertion length without custom components. Where NPT-threaded tubing is not preferred, Rheonics also offers proprietary extension tubes with a G¾" thread connection.

Compatible Probes

Compatibility with the TMA-TT requires the -TT probe designation, which indicates the presence of a G¾" rear thread. This configuration is available across nearly all SRV and SRD probe variants, with the exception of the -X6 Slimline and -X7 Reactor Probe. Notably, all -X8 probe variants incorporate this rear thread as a standard design feature.

Probes equipped with process connections such as NPT threads, Tri-Clamp fittings, or ANSI flanges may be ordered with the -TT designation, which adds the G¾" rear thread without altering the primary process connection. It should be noted, however, that certain flange configurations may be mechanically incompatible with the TMA-TT-SPS protection bars. 

The next figure shows an SRV-X3-15T-TT probe (1.5” Tri-Clamp flange with G3/4” rear thread).

Figure 3: SRV-X3-15T-TT: 1.5” Tri-Clamp SRV probe with rear thread (G3/4”)

Assembly parts

Figure 4: TMA-TT Exploded view

Related Information

1. Ultra-long insertion sensor type SR-TT assembly instructions