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).
- Intrinsically safe
- Modular design - available in four different configurations
- Converter is compatible with various element types (Pt100, Cu90, Cu100 and PtCu100)
- Easily configurable via Varec's 6005 STG or 4590 TSM
- Continuous water bottom measurement
- Variety of process connections and cable entries available to meet worldwide classifications and requirements
- Contact Varec for ATEX or IECEx approved devices
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.
- 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)
- 1 x G (PF) ½, thread
- 1 x NPT ½, thread
- 1 x PG16, thread
- 1 x M20, thread
- 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
- 3m (3000mm or 118")
- 2m (2000mm or 79")
- 1.5m (1500mm or 59")
- 1m (1000mm or 39")
- Custom element position & spacing
- 3 ft to 131 ft (1 to 40 Meters) below flange to edge of probe
- Anchor weight (tall profile)
- Anchor weight (short profile)
- Tensioning wire + top anchor