The Ametek Jofra RTCt-700 is a high temperature reference temperature calibrator covering 33 to 700°C (91 to 1292°F). It brings the Touch (t) platform, with touchscreen, wireless connectivity and graphical calibration views, to the proven high temperature performance of the RTC-700, which it replaces.

Three independently controlled heating zones minimise axial gradients through the insert, while the patented Dynamic Load Compensation (DLC) system measures and compensates in real time for sensor load, size and position. The result is close to liquid bath uniformity in a portable 11.3kg dry block, with fast heating (33 to 700°C in 45 minutes) and cooling (700 to 100°C in 43 minutes). It is suited to energy production, metal processing, aerospace, pharmaceutical and advanced manufacturing work, and is rated best performing dry block against the EURAMET cg-13 guideline.

Models

• Model A, Basic: calibrator using the internal reference sensor, no inputs.
• Model C, Middle: adds the DLC sensor input, the external reference sensor input and Set-Follows-True.
• Model B, Full: as model C plus dual sensor-under-test inputs for RTD, thermocouple, mA, V and switch test, with 24VDC transmitter supply.

Triple-zone heating and patented DLC

The DLC sensor sits in the insert and checks the temperature profile in real time. Benefits include calibrating several sensors at once, calibrating thick sensors, independence from the sensor's thermo sensitive length, and reliable results with elements up to 60mm long. A DLC indicator shows green, red or grey so you can see when readings can be taken.

Touchscreen and wireless control

The touchscreen offers configurable views, six user-defined setpoints, auto stepping through up to 20 temperature steps with hold times, and user-defined data naming for easy retrieval. A web browser interface over the supplied Wi-Fi dongle lets you monitor, control and analyse a calibration from anywhere in the facility. Ethernet and USB are also provided.

Real-time calibration graph and switch testing

The patent pending real-time graph shows the setpoint, reference and sensor-under-test readings with stability status. Model B adds automatic switch testing with open, close and hysteresis results.

Accuracy features

• Set-Follows-True (models B and C): adjusts the setpoint from the external reference sensor so the calibration zone matches the target.
• Mains Variance Immunity (MVI): converts the incoming supply to steady DC for stable control on unstable power.
• Intelligent reference sensors: STS-200 sensors carry their coefficients, serial number and calibration date in the plug for plug and play use.
• Support rod set: holds sensors securely during calibration.

Key specifications

• Temperature range: 33 to 700°C at 23°C ambient
• Accuracy with external STS reference sensor: ±0.11°C (33 to 660°C, models B and C)
• Accuracy with internal reference sensor: ±0.29°C (33 to 420°C) up to ±1.2°C (660 to 700°C)
• Stability: ±0.008 to ±0.020°C
• Axial homogeneity: ±0.10 to ±0.40°C
• Resolution: down to 0.001°
• Time to stability: about 10 minutes
• Immersion depth: 200mm; insert 29.7mm OD x 210mm long
• Communication: Wi-Fi dongle, Ethernet and USB
• Power: 230V, 1150VA; operating temperature 0 to 40°C; IP-10
• Weight and size: 11.3kg, 362 x 171 x 421mm

How to order

Choose the model, then the optional DLC sensor and STS reference sensor (models B and C), the calibration certificate and any carry case or support rod. The builder follows the Jofra order code, for example RTCt700 B 230 F NON DLC R4 HS CT. Inserts are ordered separately: predrilled metric or imperial inserts, multi-hole kits or undrilled inserts. All predrilled inserts include holes for the 4mm and 1/4" reference sensors and the DLC sensor.

Extra parts available on request: Wi-Fi dongle 130817, extra sensor grip fixture 125066, extra sensor grip 125067, and thermocouple male plugs for types J, K, N, T, R/S and Cu-Cu.

See the data sheet under Downloads for full specifications.