HERMetic Onecal without Frame for Storage Tanks

HERMetic Onecal without Frame for Storage Tanks

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Accurate temperature measurement is very important in the petroleum industry. Great care is, therefore, required in the selection of temperature measuring instrument. Designed for use in hazardous environments, Honeywell’s HERMetic Onecal is a highly accurate, intrinsically safe portable digital field thermometer for temperature verification in Zone 0 areas.

​Honeywell Tanksystem’s Onecal is specifically designed to meet the highest accuracy standards (ISO 4268, API Manual of Petroleum Measurement Standards Chapter 7) in the oil industry for temperature verification. The electronic display unit is fitted with a 2-meter cable and sensor for temperature verification. This unit can be used for temperature verification in laboratories or in smaller tanks having with an opening of more than 16 mm (or 5/8”) in order to allow penetration of the sensor inside the tank.

​The goal of the measurement is to determine as accurately as possible the platinum resistance temperature detector (RTD) resistor value and to calculate the corresponding temperature. For achieving such a high standard in accuracy, repeatability and reproducibility, the resistance of the cable and instrument electronics is continuously measured and compensated for any external variation, The measurement routine is totally under the control of the micro-controller. A high precision resistor is used as the reference to calibrate the measuring chain. This allows best possible accuracy for a field thermometer and permits the use of the Onecal as the reference thermometer against all other potential temperature devices.

​Due to the relatively high thermal expansion coefficients of crude oil and petroleum products, a 1°C / 2°F error in temperature measurement can equate to an error of approximately 0.1 percent in the standard volume calculation. Honeywell’s Onecal not only provides highly accurate temperature measurement but also ensures increased repeatability and accuracy of measurements, safety, ease of operation, reliability and cost-effective maintenance.

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HERMetic OnecalThe HERMetic Onecal is a portable electronic digital thermometer for field temperature measurement in above ground storage tanks.795.77 KBProduct Information Note30 May 2012
Product Catalogue for Land Based Applications Complete product portfolio of Honeywell Tanksystem portable level gauging and sampling solutions for land based applications2.14 MBProduct Information Note30 May 2012

Maintenance and support are critical aspects to consider when choosing a technology partner.  Honeywell Tanksystem provides all its equipment with a comprehensive and detailed operation & service manual which allows the user to perform repairs or parts exchange without sending back the unit to factory. Please contact tanksystem@honeywell.com if you miss the operation manual of your particular model. If required an official service station network is available to assist you for maintenance or calibration purpose. Check the Service Station list in the operation manual to find the closest service station.

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