Certificate for marine applications
Trafag's ECL 8439 level transmitter is certified for marine applications by BNV-GL with EU RO mutual recognition. Type approvalThis certificate is regonized by all major classification societies ; ABS, BV, CCS, CRS, IRS, KR, LR, ClassNK, PRS, RINA & RS.
Marine Approval EU RO MR by DNV-GL
MRC stands for Mutual Recognition Certificate, often also referred to as MR TAC (Mutual Recognition Type Approval Certificate): One classification society evaluates the product and assesses the conformity with the respective specifications, and this organization also issues the MRC certificate.
The MR TAC is intended to enable Mutual Recognition (MR) of certain type approved products, through the uniform application of MR Technical Requirements, to enable those products to be installed on board of ships for which MR TACs are issued by one or more of the EU ROs.
- DNV GL
Configurable measuring ranges (Google Play / Bluetooth)
The submersible pressure transmitter (ECL 8439) offers optionally adjustable measuring ranges which can easily be configured by non-experts. The adjustment of the measuring range via the SMI Sensor Master Interface and the Android app eases the commissioning for the actual installation including last-minute changes on the spot. Standard types can be individually adjusted, allowing a massive reduction of stock variety and complexity and fast availability for spare parts.
The combination of configurable measuring ranges with EU MR RO marine approval by DNV-GL is unique in the price class of the ECL 8439. For companies in the marine business which have to cover a wide range of installation varieties, the ECL 8439 is an excellent solution to reduce complexity and streamline ordering and stocking of level sensors.
Clogging and viscous media
In water treatment, pressure sensors are often not only measuring level of clean water, but also liquids which contain particles or might be of a high viscosity. For these cases, the submersible pressure transmitter (ECL 8439) offers a wide process opening to avoid any clogging of the sensor. To protect the sensitive membrane from accidental damage, the housing was designed with a conical, non-flush process interface.
Different steels for salt water and corrosive liquids
The submersible pressure transmitter (ECL 8439) is a preferred solution for water applications with potentially corrosive salt content, because of the extremely corrosion resistant ceramic sensor and the option to select between the cost-effective AISI316L (1.4404) stainless steel housing material and the more corrosion resistant duplex steel 1.4462. Typical applications are tank level measurement for ballast water management systems or desalination equipment and plants.
Although in many cases regular stainless steel is used for cost reasons, experience in the field shows even the relatively common AISI316L can fail before time due to corrosion. Typically, the higher the temperature and / or the higher the salt or corrosive content, the faster it fails.
There are two major criteria to assess the corrosion resistance against salt water of a stainless steel: both depending on the contents of the material.
PREN Pitting Resistance Equivalent Number and CPT Critical Pitting Temperature
Exact testing procedures to measure the PREN corrosion resistance of various types of stainless steel are specified in the ASTM G48 standard. Generally, the higher the PREN-value, the more corrosion resistant the steel is, and steels with PREN-values above 32 are considered seawater (corrosion) resistant. The PREN of 1.4404 (AISI316L) is 23...28.5 whereas the 1.4462 duplex steel is at 31...38, depending on the exact composition of contents.
There are different methods to assess the CPT which is defined as the "lowest temperature on the surface of the specimen at which stable propagating pitting occurs under specified test conditions" (ISO 17864:2005), some basic empiric rules of thumb based simply on the Molybdenum content. The CPT of 1.4404 (AISI316L) is between 24 and 27.5°C compared to 27.5...34.5°C of the 1.4462 duplex steel. Therefore, particularly for higher temperatures e.g. in tropical seawater, 1.4462 is the safer choice.
- For an easy cable mount
- To reduce tension in the cable
- Stainless steel
Venting Box IP67
- To ensure proper venting through transmitter cable.
- To optimize cabling cost --> vented cable is not for the whole length required