Portable calibrator LTR-90

temperaturedry-block

Description
The LTR-90 is a portable dry-block calibrator designed for on-site calibration of temperature sensors used in cold rooms, freezers, freeze dryers, incubators and sterilizers. Operating from −90 °C to +140 °C with Stirling cooling, it combines fast response and high stability for ultra-low temperature applications. It supports standalone operation via the front panel or integration with Kaye Validator systems for automated calibration.

Key features

• Operating range: −90 °C to +140 °C
• Stirling cooler: reaches −90 °C in ≈80 minutes (−95 °C in ≈90 minutes)
• Temperature stability: ±0.015 °C (listed) / 0.02 °C (table)
• Axial uniformity: 0.05 °C across full range
• Custom block: 2 IRTD reference wells + 4 inserts (each insert supports up to 3 thermocouples)
• Well sizes: calibration wells 6 × 9 mm × 155 mm; reference wells 2 × 6.7 mm × 155 mm
• LED display resolution 0.01 °C; RS232 interface
• Rubber insulator cap to reduce frost; two-handle carry design for portability
• Weight: 16 kg (35 lb)

Applications

• Calibration in cold rooms and stability chambers
• Freezers and ultra-low freezers
• Freeze dryers (lyophilizers)
• Incubators and glove boxes
• Autoclaves and steam sterilizers
• Fermenters and SIP processes

Specifications

• Model: LTR-90
• Temperature range: −90 °C to +140 °C
• Temperature stability (table): 0.02 °C; listed stability ±0.015 °C
• Transfer calibration accuracy (IRTD → thermocouples): −40 °C to −25 °C: ±0.15 °C; −25 °C to 80 °C: ±0.1 °C; 80 °C to 130 °C: ±0.15 °C
• Typical heat-up / cool-down times: 25 °C→80 °C = 6 min; 25 °C→140 °C = 14 min; 23 °C→−90 °C = 80 min; 140 °C→23 °C = 60 min
• Block configuration: 2 × 6.7 mm × 155 mm (reference); 6 × 9 mm × 155 mm (calibration)
• Display: LED, 0.01 °C resolution
• Interface: RS232
• Dimensions: 343 × 198 × 318 mm
• Power: 115 VAC 60 Hz, 3 A or 230 VAC 50 Hz, 1.5 A — 350 W

Documents & compatibility
Compatible with Kaye Intelligent RTD (IRTD) probes and Kaye Validator systems. Backward compatible with Validator 2000, Validator AVS, ValProbe RT and RF ValProbe for automated calibration; can operate standalone via front panel.