VMETEK SENSORS, TEST & CALIBRATION User manual Reference Temperature Calibrator Jofra RTCt-156/157/168 A/B/C

User Manual Reference Temperature Calibrator JOFRA RTCt -156/157/168 A/B/C  Copyright 2025 AMETEK Denmark A/S

This user manual applies to the following instruments: Temperature calibrator Temperature calibrator with sensor and reference inputs Temperature calibrator with reference input Temperature calibrator Temperature calibrator with sensor and reference inputs Temperature calibrator with reference input Temperature calibrator Temperature calibrator with sensor and reference inputs Temperature calibrator with reference input These instruments are temperature calibrators designed to calibrate temperature sensors and thermostats. The RTCt -156/157 A/B/C instruments are designed as dry-block calibrators,...

• RTC -168 A/B/C only (liquid bath) - OPTIONAL : • 1 liquid bath kit consisting of : - 1 sensor basket with temperature equalizer tube - 1 insulating ring for spill tray - 1 liquid drainage syringe - 1 oil material safety data sheet

Read this manual carefully before using the instrument! Please follow the instructions and procedures described in this manual. They are designed to allow you to get the most out of your calibrator and avoid any personal injuries and/or damage to the instrument. The screen menus shown in this manual represent the menus displayed when using a B-model. /v-®\ These calibrators contain Electrical and Electronic circuits and must be recycled or disposed of properly (in accordance with the WEEE Directive 2012/19/EU). • Always supply the calibrator using a power circuit which is separate from essential...

• When cleaning the well or the insertion tube, REMEMBER to wear goggles when using compressed air in the dry-block calibrator and cleaning oil in the liquid bath calibrator. • Remember to use appropriate protective equipment or get help when carrying the calibrator (for a longer distance) to prevent injuries from dropping the calibrator. About the front panel: • For B and C models only, the sockets on the input module must NEVER be connected to voltages exceeding 30V with reference to ground. • Thermostats connected to the switch test input must not be connected to any other voltage source during...

By reducing the "Max. SET-temperature allowed”, the calibrator cannot be used outside this temperature range. Be aware of the flash point, the boiling point and other liquid properties applicable to the usage when setting the Max. SET-temperature. Read the MSDS (Material Safety Data Sheet) of the liquid before use. The Max. SET-temperature must never exceed liquid flash point –50°C. Always remove the liquid from the calibrator before transportation. Product information on the liquid must be carefully investigated before use. Do not handle hot liquid. Do not pour water or any other liquids into...

Remove the insulation plug while heating up. It is very important that humidity in the well and insertion tube is removed to prevent corrosion and frost expansion damages. • Do not use the instrument if the internal fan is out of order. • Before cleaning the calibrator, you must switch it off, allow it to cool down and remove all cables. • Always place power cables and cables for attached accessories, such as sensors, in a safe way to reduce the risk of tripping. • When transporting (carrying) the calibrator, be extra careful not to drop it on other materials, equipment, and body parts. • Ensure...

• The insertion tube must never be forced into the well. The well could be damaged as a result, and the insertion tube may get stuck. • The insertion tube must always be removed from the calibrator after use. The humidity in the air may cause corrosion oxidation on the insertion tube inside the instrument. There is a risk that the insertion tube may get stuck if this is allowed to happen. • If the calibrator is to be transported, the insertion tube must be removed from the well to avoid damage to the instrument. • The tip of the sensor should rest at the bottom of the sensor basket for optimum...

The RTC -B-models have a precision reference input. To achieve the high precision, a set of sensor coefficients relating to the specific sensor must be present in the RTCt. Before use of the RTCt, ensure that the correct coefficients in the RTC are equal to those from the sensor’s calibration certificate. This is done with the included PC software JOFRACAL. Please read how to do in the chapter "Reference Sensors” in the JOFRACAL user manual. • The calibrator must not be used for any purposes other than those described in this manual, as it might cause a hazard. • The calibrator has been designed...

About the liquid bath (RTC* -168 A/B/C only): • For liquid bath ensure that the sensor is absolutely clean and dry as a few drops of water in the well (liquid baths) might cause a steam explosion. • Do not pour cold liquid into a hot well - it might cause an explosion. • AMETEK Denmark A/S does not take any responsibility, if the well is filled with other liquids than those recommended. • Liquid baths should only be operated by trained personal. • Heat transfer liquids must only be used in calibrators prepared as a liquid bath. If these liquids are heated above specified temperature, they will...

Setting up a dry-block calibrator Follow the instructions below before using the calibrator: Warning Always position the calibrator to enable easy and quick disconnection of the power source (mains inlet socket). 1. Place the calibrator on an even horizontal surface where you intend to use it. Do not use the instrument if the internal fan is out of order. The well must be clean before use. Ensure a free supply of air to the internal fan located at the bottom of the instrument (pos.). The area around the calibrator should be free of draught, dirt, flammable substances, etc. Check that the fuse...