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4532 ATC Intrinsically safe temperature and water bottom measurement for inventory control and custody transfer applications

4539 Average Temperature/Water Bottom Sensor and Converter

The 4539 Average Temperature/Water Bottom Sensor and Converter (ATC) provides a single intrinsically safe solution for average temperature and water bottom (interface) measurement and signal conversion. Any of the 4539 ATC elements - temperature sensor (Pt100 elements), water bottom sensor (water to oil layer detection) or converter - can be combined to produce a single new instrument or retrofit device. Data collected, converted and transmitted can be used in temperature compensated volumetric calculations for inventory management and custody transfer tank gauging applications.

The 4539 ATC can be combined with various HART compatible devices and tank sensors, such as Varec's 6005 Servo Tank Gauge (STG) , 7200/7500 Radar Tank Gauges (RTG) and the 4590 Tank Side Monitor (TSM).

Spot temperature Measurment Optional 40-240 VAC power supply PCB includes four (4) output contacts and an additional two (2) discrete inputs Simple connector board - no messy wire connectors 3-wire temperature input (PT100, Cu90, Cu100) for volume calculations and two (2) discrete inputs for mechanical level switches Upgrade provisions for additional or future software and communications functions Precision direct-drive stainless steel gearing eliminates the problems associated with Geneva gears Infrared optical sensors not affected by direct sunlight Absolute encoder - maintains correct level reading even after a power outage - no battery required On-board galvanically-isolated power circuit (20-65 DC) and optically-isolated communications Rotary switches allow you to configure the transmitter without a handheld device Single electronics assembly snaps in and locks down for easy retrofit Dual-encoder discs with reflective gold plating and reference tracks ensure an accurate level reading

Average Temperature Converter

The 4539 ATC can be retrofitted onto an existing average temperature probe. It converts Cu90, Cu100, PtCu100 and Pt100 temperature element resistance values into digital numeric data on HART protocol signal output. It is compatible to both multi-resistance thermometers (MRT) and multi-spot thermometers (MST).

Average Temperature Sensor & Converter

To meet the tough demands of custody transfer applications, the 4539 ATC sensor and converter combination is intrinsically safe and provides a maximum of 16 class A Pt100 elements for average temperature measurement.

Water Bottom Sensor & Converter

Combining only the 4539 ATC water bottom sensor with converter allows independent measurement of water interface level.

Average Temperature & Water Bottom Sensor and Converter

Both high accuracy temperature and continuous water interface measurement data are transmitted by the HART converter to host gauges, such as the 6005 Servo Tank Gauge or 4590 Tank Side Monitor.


Custody Transfer Approved Measurement

The 4539 Average Temperature Converter and Sensor combination is custody transfer approved and provides less than ±0.1 °C of measurement deviation. Once configured to "W&M mode", all the changeable parameters are frozen by software and mechanical switch protection.

Average Temperature Calculation

Both liquid and gas average calculation are performed based on level input from the host gauge. In order to provide sufficient averaging data, the 4532/9 Series ATC considers appropriate elements, positioning 300 mm (11.8") below (for liquid average) or above (for gas average) liquid surface, to be a factor of precise average temperature calculation (default setting).

Water Bottom Sensor

The water bottom (capacitance) sensor is important for the detection of water below product (mainly crude oil) and determines water level by sensing the dielectric constant of the product in the tank. Measured data is transmitted via coaxial cable to the converter housing, where the capacitance signal is converted to a HART signal. The sensor is generally set at the bottom of the average temperature sensor. The 4539 ATCs standard water bottom measurement ranges are 1m (3.3 ft) and 2m (6.6 ft). Pt 100 elements can be set inside of this tube structure so that water bottom functionality does not affect temperature measurement.


Product Options

Protection class

Measuring function

  • Converter only
  • Temperature + Converter
  • Water Bottom + Converter
  • Temperature + Water Bottom + Converter

Temperature measuring range

  • -40...+100 °C (-40...+212 °F)
  • -55...+235 °C (-67...+455 °F)
  • -200... +71 °C (-328...+158 °F)

Water Bottom measuring range

  • 1 m (3.3 ft)
  • 2 m (6.6 ft)

Cable entry

  • 1 x G (PF) ½, thread
  • 1 x NPT ½, thread
  • 1 x PG16, thread
  • 1 x M20, thread

Process connection

  • JIS 10K 50A RF, flange
  • ANSI 2" 150Ib RF, flange
  • DIN DN50 PN 10RF, flange
  • JPI 50A150Ib RF, flange
  • Universal coupling, PF(NPS)3/4, (converter only)
  • Thread M20 (converter only)

Number of elements

  • 2...16 Pt100 elements

Element spacing

  • 3m (3000mm or 118")
  • 2m (2000mm or 79")
  • 1.5m (1500mm or 59")
  • 1m (1000mm or 39")
  • Custom element position & spacing

Probe length

  • 3 ft to 131 ft (1 to 40 Meters) below flange to edge of probe

Mounting attachment

  • Anchor weight (tall profile)
  • Anchor weight (short profile)
  • Tensioning wire + top anchor