Prothermo NMT539 Average Temperature Converter
The Prothermo NMT539 provides a single, intrinsically safe solution for average temperature and water bottom (interface) measurement. Choose the modules you need – temperature probe, water bottom sensor, converter – or combine them together into a single new instrument.
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Meets API Standards
The Prothermo NMT539 is installed vertically onto spheres, bullets, cone, dome or floating roof tanks. Measurements are based on API (American Petroleum Institute) Manual of Petroleum Measurement Standard, Chapter 7. It is ideal for high accuracy or custody transfer applications.
Liquid and Vapor Profiles
The Prothermo NMT539 can contain up to 16 temperature elements. A continuous measurement profile of average liquid and/or average vapor temperature throughout the tank is available by reading the position and temperature of each element.
Water Bottom Sensor
The Prothermo NMT539 can determine the interface between water and petroleum products in the bottom 3 or 6 ft (1 or 2 m) of a tank. Temperature (Pt 100) elements can be set inside of the water bottom sensor so that water bottom functionality does not affect overall temperature measurement.
Tank Gauging System
Power and local HART communications are provided over a 2-wire, intrinsically safe (i.s.) connection from compatible instruments, such as servo gauges or monitors, and the 4590 Tank Side Monitor (TSM).
Converter Compatibility: Pt100, Cu100, Cu90, PtCu100, JPt100 (maximum 16 elements)
With probe: up to 16 Platinum (Pt. 100), Class A elements per IEC PUB 751 1995
Temperature Accuracy: ±0.15 °C (±0.27 °F), or better conversion accuracy based on IEC 60751 class A standard
Water Bottom: 4mm (±2mm) or better accuracy (at reference condition)
‐40…+100 °C (‐40…+212 °F), ‐55…+235 °C (‐67…+455 °F), -170… +60 °C (‐328…+158 °F)
Water bottom probe: 0 to +100 °C (‐32 to +212 °F)
Power & Communications
DC16‐30V input (DC24V ±10% is supplied by the HOST i.s. HART communication line for standard applications.)
The Prothermo NMT539 consumes an average fixed current of 6 to 12 mA depending on configuration.
Factory Mutual (FM) ‐ Intrinsically Safe ‐ Class I, Division 1, Groups C/D
Contact Varec for ATEX and IECEx approved devices.
Housing: rated IP65 (open housing: IP20)
Probe: rated IP68
For complete technical specifications, download the technical document or product manual.
03 Temperature Measuring Range
04 Water Bottom Measuring Range
05 Cable Entry
06 Process Connection
07 Number of Elements
08 Element Spacing
09 Probe Length
10 Mounting Accessories
Parts and Accessories