Dry block temperature Calibrator (TH/TH(i))

Overview:

The Model 650 TH / 650 THi Dry Block Temperature Calibrator is a high-temperature precision calibration instrument designed for accurate testing and verification of thermocouples, RTDs, temperature gauges, thermometers, switches, and transmitters across industrial and laboratory environments. Operating over a wide temperature range from 35°C to 650°C (at ambient 23°C), the calibrator delivers reliable and stable performance with a display accuracy of ±0.2°C and excellent bath stability of ±0.03°C at 50°C and ±0.05°C at 650°C.

The system features fast heating capability, reaching 650°C from 50°C in approximately 20 minutes, and cooling from 650°C to 100°C in about 35 minutes, with a stabilization time of around 20 minutes to ensure efficient calibration workflow. Controlled through an advanced PID controller, the unit maintains precise temperature regulation with high radial and axial uniformity, ensuring consistent and repeatable calibration results.

The calibrator incorporates a multi-hole insertion tube with a 25.3 mm insert diameter and 150 mm immersion depth, allowing simultaneous calibration of multiple probes and improving operational productivity. A built-in temperature switch test facility enables accurate set-point verification for thermal switches, while selectable temperature units (°C/°F) and a clear LCD display enhance usability. Designed for reliable operation under conditions of 0 to 50°C ambient temperature and up to 90% non-condensing humidity, the instrument operates on a 230 V AC ±5%, 50 Hz power supply with 1800 W heating capacity. With compact dimensions of 175 × 305 × 260 mm and a weight of approximately 10 kg, the Model 650 TH / 650 THi provides a dependable, portable, and high-performance solution for high-temperature calibration, maintenance, commissioning, and quality assurance applications across industries such as power generation, oil & gas, manufacturing, and process automation.

Dry block temperature Calibrator (TH/TH(i)) Applications:

Calibration of thermocouples across medium to high temperature ranges up to 650 °C.
Calibration and verification of RTD (Resistance Temperature Detectors).
Testing and calibration of industrial temperature gauges and dial thermometers.
Calibration of temperature transmitters used in process industries.
Functional testing and set-point verification of temperature switches.
On-site and laboratory temperature sensor calibration in power plants, refineries, and manufacturing units.
Quality control and maintenance support for instrumentation departments.
Suitable for calibration service providers requiring stable and uniform temperature sources.
Calibration of long-stem temperature sensors where deeper immersion is required for improved measurement accuracy.

Model	650 TH & 650 THi
Range	35°C to 650°C
Resolution	0.1°C
Accuracy	±0.2°C @ 50°C to ±0.4°C @ 650°C
Stability	±0.03°C @ 50°C to ±0.05°C @ 650°C
Stabilization Time	20 minutes
Units	°C/°F Switchable
Measurements (Only for ‘I’ Model)	8 Types of TC & RTD Pt-100(385), mV, mA
Radial Uniformity	±0.02°C @ 50°C to ±0.04°C @ 650°C
Axial Uniformity	±0.05°C @ 50°C to ±0.5°C @ 650°C
Display	LED Green
Heating Time (50 to 650°C)	20 minutes (approx.)
Cooling Time (650 to 100°C)	35 minutes (approx.)
Switch Test Facility	Provided (only for ‘I’ Model)
Insertion Tube Diameter	25.3mm
Insertion Tube Depth	150mm
Power Supply	230V AC ±2.5/50 Hz
Weight	10 Kgs.