Technical Data
ComparePoint Level / Liquids
| Measuring Principle | Vibration Liquids |
| Characteristic / Application | Switching unit NAMUR technology for rail mounting SIL2, according 61511 Intrinsically safe |
| Supply / Communication | NAMUR 24V AC,DC / 230V AC |
| Ambient temperature | Single installation: -20 °C ... 60 °C (-4 °F ... 140 °F) Rail mounting: -20 °C ... 50 °C (-4 °F ... 122 °F) |
| Communication | 1 Channel: 1 level SPDT + 1 alarm SPST 3 Channel: 3 level SPDT + 1 alarm SPST |
| Certificates / Approvals | ATEX, FM, CSA, IEC Ex, INMETRO, NEPSI, EAC |
| Safety approvals | Overfill prevention WHG SIL |
Point Level / Solids
| Measuring Principle | Vibration Solids |
| Characteristic / Application | Switching unit NAMUR technology for rail mounting SIL2, according 61511 Intrinsically safe |
| Supply / Communication | NAMUR 24V AC,DC / 230V AC |
| Ambient temperature | Single installation: -20 °C ... 60 °C (-4 °F ... 140 °F) Rail mounting: -20 °C ... 50 °C (-4 °F ... 122 °F) |
| Communication | 1 Channel: 1 level SPDT + 1 alarm SPST 3 Channel: 3 level SPDT + 1 alarm SPST |
| Certificates / Approvals | ATEX, FM, CSA, IEC Ex, INMETRO NEPSI |
| Safety approvals | Overfill prevention WHG SIL |
The Nivotester FTL325N switch unit is used for point level detection in liquid tanks, is suitable for hazardous areas and can also be used for overfill protection of tanks containing toxic, flammable or non-flammable liquids. With two-point control and point level detection, it is perfectly suited to safety-related systems. When used together with Liquiphant with FEL56 or FEL58 electronic inserts, it complies with IEC 61508/IEC 61511 and meets SIL2 functional safety requirements.
Advantages
The Nivotester FTL325N can be connected to 1, 2 or 3 measuring elements (1, 2 or 3-channel device)
The intrinsically safe signal circuit reaches EEx ia level and can be used in hazardous areas
Online monitoring ensures functional safety up to SIL2
The DIN rail housing facilitates side-by-side installation on the standard rail of a switch box
Pluggable terminal module, simple wiring
The NAMUR interface complies with EN 50227 (DIN 19234; NAMUR) or IEC 60947-5-6, for connecting NAMUR sensors or electronic inserts
Application
The switch unit uses NAMUR input and can be rail-mounted or installed separately.
Ambient temperature: -20 to +50 °C (-4 to +122°F)
International explosion protection certification; suitable for overfill protection of tanks containing toxic, flammable or non-flammable liquids; suitable for marine use
Configurator / Comparison
Accessories/Spare parts
Source:Endress+Hauserwebsite public information
Measuring principle video
Click to playManuals & Documents 8
All documents for this model8 documents · click to expand
Nivotester FTL325N（三通道型） Chinese
Nivotester FTL325N（单通道型） 操作手册 Chinese
Nivotester FTL325N, 3-channel English
Nivotester FTL325N, single-channel Operating Instructions English
Nivotester FTL325N Chinese
技术资料 Nivotester FTL325N Chinese
Nivotester FTL325N English
Nivotester FTL 325 N Technical Information English
Case Studies
Municipal Wastewater Treatment · tuning fork — Application Case
Site Conditions
This is a Municipal Wastewater Treatment customer whose plant is at the inlet, biological and outlet stages of a municipal plant. The main task was vibrating-fork point level detection and high/low alarms.
The Problem
The difficulty lies in high solids and corrosive fractions, with large diurnal flow swings; at the same time effluent parameters drift and probes foul with sludge and biofilm. Specification therefore means choosing fork length and surface finish by density and stickiness.
What We Did
We took a level range approach — level solution matched to the actual tank and silo geometry. Delivery was built around choosing fork length and surface finish by density and stickiness, with point-by-point checks on: stable compliance with Grade 1A discharge limits and online data reporting.
Operating Outcome
In service the system performs as intended — no calibration needed, with dependable switching, with routine maintenance falling noticeably.
Food & Beverage · tuning fork — Application Case
Application Context
dosing, pasteurising, filling and CIP stages is a typical Food & Beverage duty. The project started from tuning fork, focusing on vibrating-fork point level detection and high/low alarms.
Process Constraints
frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, and syrups, dairy and beverages that scale easily, under strict hygienic requirements only amplify it. The tuning fork specification must therefore cover choosing fork length and surface finish by density and stickiness.
Delivery Approach
Delivery was handled as the level range — level solution matched to the actual tank and silo geometry. Execution centred on choosing fork length and surface finish by density and stickiness, together with food-safety and hygienic design per 3-A / EHEDG.
Field Results
Operation shows the benefit clearly — no calibration needed, with dependable switching, with confidence in this measuring point improving markedly.
Chemical & Pharmaceutical · tuning fork — Application Case
Customer Profile
The typical setting in Chemical & Pharmaceutical is reactors, metering vessels and finished-product tanks. The measuring point is tuning fork; the focus is vibrating-fork point level detection and high/low alarms.
Key Difficulties
Conditions are highly corrosive media with solvents and crystallisation, partly in explosive atmospheres and, on top of that, corrosion plus Ex protection shortens instrument life and makes downtime costly, which a standard configuration cannot handle for long. The design therefore starts with choosing fork length and surface finish by density and stickiness.
Implementation
The scope ran through the level range: level solution matched to the actual tank and silo geometry. Technically it hinges on choosing fork length and surface finish by density and stickiness, and on these requirements: Ex certification and GMP traceability of records.
Customer Benefit
In practice this means no calibration needed, with dependable switching, which cut the workload on the site maintenance team.
Power & Energy · tuning fork — Application Case
Project Background
The project covers boiler feedwater, turbine condensate and FGD/DeNOx systems. The work centres on tuning fork and the core task is vibrating-fork point level detection and high/low alarms.
Operating Challenges
The medium and duty are characterised by high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. So tuning fork cannot be specified generically — it calls for choosing fork length and surface finish by density and stickiness.
Solution
The Ainstru engineering team worked through the level range: level solution matched to the actual tank and silo geometry. The configuration involves choosing fork length and surface finish by density and stickiness, with these requirements in view: compliance with power-industry codes and unit availability targets.
Results
Since start-up the system has run steadily; the practical result is no calibration needed, with dependable switching.
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