HIOKI LR8431-20 Memory HiLogger | 10 ch isolated analog input, all channels 10 ms, ±100mV to ±60 V, K/J/E/T/N/R/S/B thermocouples

HIOKI LR8431-20 Memory HiLogger: 10 ch Isolated Input, 10 ms on All Channels

Overview

The LR8431-20 is the English-version order code of the HIOKI MEMORY HiLOGGER LR8431. Its 10 analog channels are isolated from each other (scanned with semiconductor relays) and record all channels at 10 ms, suitable for portable on-site voltage and temperature recording. It also has 4 ch pulse inputs that share a common ground with the main unit and are not isolated.

Key Specifications

• Voltage: ±100mV to ±60 V and 1-5 V f.s., 6 ranges, highest resolution 5 µV; maximum input DC 60 V.
• Thermocouple: K/J/E/T/N/R/S/B, -200 to 1800°C (depending on sensor); Pt100 and humidity sensors cannot be connected.
• Recording interval: 10 ms–1 h, 19 settings.
• Memory: Internal 3.5 M-words; external HIOKI PC card (9728 / 9729 / 9830) or USB flash drive.
• Dimensions and weight: 176 × 101 × 41 mm, 550 g; battery pack 9780 sold separately.

Applications

• Multi-point on-site recording of equipment temperature and voltage.

Specifications per the HIOKI product page (retrieved 2026-10-20).