ATAGO® PAL‑91S Digital Ethylene Glycol Refractometer

ATAGO® PAL‑91S Digital Ethylene Glycol Refractometer

The ATAGO® PAL‑91S is a digital handheld refractometer designed for fast, accurate measurement of ethylene glycol concentration and freezing temperature. The main scale displays ethylene glycol (% V/V), while the secondary scale displays freezing temperature in °C. As stated in the manual, “The main scale indicates the concentration of Ethylene glycol and the secondary scale indicates the freezing temperature.” Automatic Temperature Compensation (ATC) ensures stable readings across a wide operating range, and the IP65 water‑resistant housing allows easy cleaning under running water.

Key Features

• Dual‑scale measurement: ethylene glycol concentration and freezing temperature
• Wide Automatic Temperature Compensation (ATC) range: 10–100°C
• Fast 3‑second measurement
• IP65 water‑resistant design (not submersible)
• NFC data output with 100‑record memory
• Backlit display (30‑second auto‑off)
• Requires only water for zero‑setting
• Compact 100 g handheld design

More About This Item

The PAL‑91S requires only ~0.3 mL of sample and provides immediate readings of ethylene glycol concentration and freezing temperature. Measurements stabilize once the prism acclimates to sample temperature — “Wait for approximately 20 seconds… measurements will stabilize once the instrument acclimates to the sample temperature.” The sapphire‑coated prism and spill‑resistant sample stage support routine industrial use. NFC output allows transfer of date/time, glycol %, freezing temperature (°C), and prism temperature to compatible devices.

Technical Specifications

• Model: PAL‑91S
• Catalog Number: 4491
• Main Scale: Ethylene glycol 0.0 to 90.0% (V/V)
• Secondary Scale: Freezing temperature 0 to –50°C
• Temperature Display: 10.0 to 100°C
• Resolution: Ethylene glycol 0.2%; Freezing temperature 1°C; Temperature 0.1°C
• Accuracy: Ethylene glycol ±0.4%; Freezing temperature ±1°C; Temperature ±1°C
• Automatic Temperature Compensation Range: 10 to 100°C
• Ambient Temperature Range: 10 to 40°C
• Sample Volume: At least 0.3 mL
• Measurement Time: Approx. 3 seconds
• Backlight: Stays on for 30 seconds after any button press
• Data Storage: 100 measurements
• Output: NFC Forum Type 4 Tag / ISO/IEC 14443 Type A
• Output Fields: Date/time, ethylene glycol (mL/100 mL), freezing temperature (°C), prism temperature (°C)
• Power Supply: 2 × AAA alkaline batteries
• Battery Life: Approx. 11,000 measurements
• Protection Class: IP65 (water‑resistant)
• Dimensions: 55(W) × 31(D) × 109(H) mm
• Weight: 100 g
• Warranty: 1 year (extendable to 2 years with registration)

Included Accessories

• Main unit
• Instruction manual
• Calibration report
• 2 × AAA alkaline batteries

The PAL‑91S is ideal for HVAC technicians, chiller system maintenance, industrial cooling loops, and laboratory workflows requiring fast, repeatable ethylene glycol concentration and freezing‑temperature measurements. Its wide ATC range, NFC data output, and rugged IP65 housing make it a dependable tool for daily use.

This item is NON-REFUNDABLE/NON-RETURNABLE once the order is placed. Please call if you are unsure this item will work for you