Nagman 650H Medium Temperature Dry Block Calibrator

Nagman 650H Medium Temperature Dry Block Calibrator (20°C above Ambient to 650°C)

The Nagman 650H is a heavy-duty, portable dry block temperature calibrator engineered specifically for fast, accurate on-site calibration of thermal sensors. Built to withstand rigorous shipboard environments and heavy industrial plants, it meets strict quality and safety compliance benchmarks. It features an advanced auto-tune PID temperature controller, an integrated switch test facility, and interchangeable single or multi-hole thermowell inserts to accommodate diverse probe dimensions without fluid media hazards.

Model Details

• Manufacturer: Nagman Instruments & Electronics (P) Ltd.
• Model Series: 650H (Standard Heavy-Duty Portable Bench-Top Unit)
• MPN (Manufacturer Part Number): NAG-650H

Key Features & Functional Ratings

1. Precision Auto-Tune PID Controller: Ensures tight temperature control loops, fast thermal settling, and steady-state thermal stability within ±0.5°C.
2. Integrated Switch Test Facility: Built-in terminals evaluate thermal switches and thermostats with open/closed contact status via a safe 5V DC excitation loop.
3. Interchangeable Insert Blocks: Standard multi-hole and single-hole thermowell sleeves match outer diameters of 1/4” and 1/2” probes, with customized metric/imperial sizing optional.
4. Dry Block Architecture: Eliminates messy, hazardous silicone oil baths, ensuring clean and dry execution during high-temperature engine room checks.
5. Rugged Heavy-Duty Chassis: Compact, robust enclosure designed to endure vibration, frequent transit, and harsh marine climate operations.

Compatible Equipment Models

• Temperature Sensors: Industrial RTDs (Pt100, 3-wire/4-wire configurations), Thermocouples (Type K, J, S, T), and bimetallic dial thermometers.
• Switches & Indicators: Local temperature alarm switches, exhaust gas temperature (EGT) safety cut-outs, and digital panel indicators.
• Software Interfacing: Compatible with optional Caltemp calibration software via RS-232 communication port.

Applications

• Marine Engineering: Exhaust gas temperature monitoring checks for auxiliary and main marine diesel engines (MAN, Wärtsilä, Sulzer, etc.).
• Process Plants: Heat exchangers, boiler feed water line temperature sensor verifications, and reactor thermowell testing.
• Offshore Rigs: Calibration of safety trip loops, HVAC duct sensors, and hydraulic oil temperature transmitters.

Marine Engineer’s Guide

• Thermal Equilibrium: Always allow a stabilization soak time of at least 15 to 20 minutes after the block reaches its set point before logging calibration data. Premature reading leads to span errors due to thermal gradient lags between the block and the sensor tip.
• Insertion Depth Matching: Ensure the unit under test (UUT) is inserted to the absolute bottom of the thermowell block (110 mm depth). Inadequate immersion depth causes stem conduction errors, pulling heat away from the sensor element.
• Cleanliness Protocol: Never use thermal paste inside the dry block at temperatures exceeding 400°C unless specified, as carbonization will fuse the insert sleeve to the well wall, making extraction impossible. Keep the bores clean using a brass wire brush.

Frequently Asked Questions

What is the maximum operating temperature of the Nagman 650H?

The Nagman 650H operates from 20°C above ambient up to a maximum temperature of 650°C, making it ideal for medium-temperature industrial and marine applications.

Can this calibrator test temperature switches?

Yes. It features an integrated switch test function with 5V DC open circuit terminals to automatically capture trip and reset points for mechanical and electronic thermostats.

Does the unit require liquid media?

No, the Nagman 650H is a dry block calibrator utilizing precision-machined aluminum/alloy insert blocks, eliminating messy silicone oils or salt baths.

What calibration standards do the test certificates follow?

Calibration certificates provided are traceable to national/international standards, aligned with ISO/IEC 17025 laboratory guidelines.