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home > Hioki U8551 Universal Unit Plug-in Module (15-Channel) for LR8450 Memory HiLogger > Hioki U8551 Universal Unit Plug-in Module (15-Channel) for LR8450 Memory HiLogger

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Hioki U8551 Universal Unit Plug-in Module (15-Channel) for LR8450 Memory HiLoggerHioki U8551 Universal Unit Plug in Module (15 Channel) for LR8450 Memory HiLogger Key Features At A Glance Modular portable data logger accepting plug in and wireless units for voltage, temperature, humidity, resistance, and strain LR8450 supports up to 4 plug in units (120 ch); LR8450 01 adds up to 7 wireless units for up to 330 channels Each unit incorporates its own A D converter, keeping the maximum sampling rate high even as channels are added

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Hioki U8551 Universal Unit Plug-in Module (15-Channel) for LR8450 Memory HiLogger

Name: Hioki U8551 Universal Unit Plug-in Module (15-Channel) for LR8450 Memory HiLogger
Brand: www.carladuclos.com
SKU: 6854615077
Price: 930.50 USD
Availability: InStock
Rating: 4.0684000000000005 (577 reviews)

Key Features At A Glance

Modular portable data logger accepting plug-in and wireless units for voltage, temperature, humidity, resistance, and strain
LR8450 supports up to 4 plug-in units (120 ch); LR8450-01 adds up to 7 wireless units for up to 330 channels
Each unit incorporates its own A/D converter, keeping the maximum sampling rate high even as channels are added
Sampling down to 1 ms for voltage and strain; 10 ms for temperature, humidity, and resistance measurement
7-inch WVGA (800x480) TFT color LCD with simultaneous waveform and numerical-value display
LAN (Ethernet) with HTTP/FTP servers and FTP/NTP clients, USB host and function ports, and SD memory card slot
8-channel alarm output and 8-channel pulse measurement, plus two switchable 5/12/24 V sensor power outputs
3-year product warranty; built-in buffer memory retains measurement data through power or wireless interruptions
Battery-pack operable for measurement where AC power is unavailable; 3-year product warranty

The Hioki LR8450 Memory HiLogger is a portable, modular multi-channel data logger built around your choice of plug-in and wireless measurement units. It is offered in two models: the Standard Model LR8450, designed for use with plug-in units only, and the Wireless LAN Model LR8450-01, which adds support for wireless units. A single logger can record voltage, temperature (thermocouple and RTD), humidity, resistance, and strain, gathering all of those signals into one synchronized time sequence.

The LR8450 is applied across a range of measurement tasks. It is used for voltage measurement of pressure-sensor and vibration-sensor outputs at up to a 1 ms sampling rate, for battery temperature-rise monitoring, automotive part temperature measurement, and road testing of automobiles. It is used to measure temperature near inverters and batteries, to test hydraulic equipment, and for strain measurement on pipes, aircraft wings, brakes, and the stress and load on moving parts. With wireless units, strain gages can be placed close to the measurement point so that the long, thin gage wires that are prone to breakage are kept short.

ValueTronics stocks and holds its own inventory in a 20,000 square-foot secure warehouse at 1675 Cambridge Drive in Elgin, Illinois, so the instruments we list are equipment we keep on hand. That combination lets engineers source a configured LR8450 logger with confidence in both its condition and its availability.

Compare Other Models in This Series

The Memory HiLogger LR8450 family is offered in two models that share the same instrument platform, display, and measurement-unit ecosystem. The Standard Model LR8450 is designed for use with plug-in units only, while the Wireless LAN Model LR8450-01 adds the ability to connect wireless measurement units in addition to plug-in units.

Both models accept the same plug-in measurement units and the same SD/USB storage, drive the same 7-inch color display, and provide the same LAN, USB, pulse, alarm, and voltage-output interfaces. The choice between them is driven by whether wireless measurement units and wireless LAN connectivity are needed for the application.

Each model below is its own dedicated product page with condition-matched pricing. Select the new LR8450 or LR8450-01 configuration that matches your required channel count and connectivity, and review that page for its specific availability and price.

The two models differ in connectivity and maximum channel count. The Standard LR8450 connects up to four plug-in units for as many as 120 channels. The LR8450-01 adds support for up to seven wireless units, which can be mixed with plug-in units for a maximum of 330 channels, and it includes a wireless LAN interface (IEEE 802.11b/g/n) with access point and station modes that the Standard model does not provide.

Beyond connectivity, the LR8450-01 introduces wireless-specific behavior: each wireless unit carries its own buffer memory for data retention during communication dropouts, and the logger periodically corrects the sampling-timing shift between mixed wireless and plug-in units. See the comparison table that follows for the per-model channel maximums and interface differences.

Model	Channels	Max Sampling Rate	Measurement Target
U8551	15	10 ms	Voltage, thermocouples, humidity, RTD, resistance
LR8450	120	1 ms	—
LR8450-01	330	1 ms	—
U8550	15	10 ms	Voltage, thermocouples, humidity

Additional differences in specifications beyond the few shown above are not listed here — see each model's full specifications below.

Accessories Supplied

Instruction Manual
Installation screws × 2

Product Core & Specifications

Specification	Value
General Specifications
Number of input channels	15 (set voltage, thermocouple, humidity, RTD, or resistor for each channel)
Input terminals	Push-button type terminal block (4 terminals per channel)
Output terminals	M3 screw-type terminal block (1 output, 2 terminals); Z2000 Humidity Sensor power supply (can power up to 15 Z2000 sensors)
Measurement target	Voltage, thermocouples, humidity, RTD, resistor
Input type	Scanning by semiconductor relays; all channels isolated (not isolated when measuring with RTD, resistance or humidity)
A/D resolution	16 bits
Maximum input voltage	±100 V DC
Maximum channel-to-channel voltage	300 V DC (not isolated when measuring with RTD, resistance or humidity)
Maximum rated terminal-to-ground voltage	300 V AC, DC (humidity measurement not isolated)
Input resistance	10 MΩ or greater (10 mV f.s. to 2 V f.s., thermocouple, RTD and resistor ranges); 1 MΩ ±5% (10 V f.s. to 100 V f.s., 1-5 V f.s., humidity)
Allowable signal source resistance	1 kΩ or less
Data refresh interval	10 ms to 10 s (10 selectable levels)
Dimensions	Approx. 134W × 70H × 63D mm (5.28″W × 2.76″H × 2.48″D)
Mass	Approx. 318 g (11.2 oz.)
Voltage Accuracy (23 ±5°C, 1 Year)
10 mV f.s.	Resolution 500 nV; measurable −10 mV to 10 mV; accuracy ±10 µV
20 mV f.s.	Resolution 1 µV; measurable −20 mV to 20 mV; accuracy ±20 µV
100 mV f.s.	Resolution 5 µV; measurable −100 mV to 100 mV; accuracy ±50 µV
200 mV f.s.	Resolution 10 µV; measurable −200 mV to 200 mV; accuracy ±100 µV
1 V f.s.	Resolution 50 µV; measurable −1 V to 1 V; accuracy ±500 µV
2 V f.s.	Resolution 100 µV; measurable −2 V to 2 V; accuracy ±1 mV
10 V f.s.	Resolution 500 µV; measurable −10 V to 10 V; accuracy ±5 mV
20 V f.s.	Resolution 1 mV; measurable −20 V to 20 V; accuracy ±10 mV
100 V f.s.	Resolution 5 mV; measurable −100 V to 100 V; accuracy ±50 mV
1-5 V f.s.	Resolution 500 µV; measurable 1 V to 5 V; accuracy ±5 mV
Temperature — Thermocouple (excluding reference junction compensation; JIS C1602-2015, IEC584)
K (100/500/2000°C f.s.)	0°C to 100°C: ±0.5°C; 500°C to 1350°C: ±0.7°C; −100°C to <0°C: ±0.7°C; −200°C to <−100°C: ±1.4°C
J (100/500/2000°C f.s.)	0°C to 1200°C: ±0.5°C; −100°C to <0°C: ±0.7°C; −200°C to <−100°C: ±0.9°C
E (100/500/2000°C f.s.)	0°C to 1000°C: ±0.5°C; −100°C to <0°C: ±0.7°C; −200°C to <−100°C: ±0.9°C
T (100/500/2000°C f.s.)	0°C to 400°C: ±0.5°C; −100°C to <0°C: ±0.7°C; −200°C to <−100°C: ±1.4°C
N (100/500/2000°C f.s.)	0°C to 1300°C: ±0.9°C; −100°C to <0°C: ±1.1°C; −200°C to <−100°C: ±2.1°C
R / S (500/2000°C f.s.)	0°C to <100°C: ±4.4°C; 100°C to <300°C: ±2.9°C; 300°C to 1700°C: ±2.2°C
B (2000°C f.s.)	400°C to <600°C: ±5.4°C; 600°C to <1000°C: ±3.7°C; 1000°C to 1800°C: ±2.4°C
C (100/500/2000°C f.s.)	0°C to 2000°C: ±1.7°C
Reference junction compensation (INT)	At INT RJC, total accuracy = add ±0.5°C
Humidity (use Humidity Sensor Z2000)
100% rh f.s.	Resolution 0.1% rh; measurable range 5.0% rh to 95.0% rh
Temperature — RTD (3-wire/4-wire; Pt100/JPt100/Pt1000)
Pt100 (100°C f.s.)	Resolution 0.01°C; measurable −100°C to 100°C; accuracy ±0.5°C
Pt100 (500°C f.s.)	Resolution 0.05°C; measurable −200°C to 500°C; accuracy ±0.7°C
Pt100 (2000°C f.s.)	Resolution 0.1°C; measurable −200°C to 800°C; accuracy ±0.9°C
JPt100 (100°C f.s.)	Resolution 0.01°C; measurable −100°C to 100°C; accuracy ±0.5°C
JPt100 (500°C f.s.)	Resolution 0.05°C; measurable −200°C to 500°C; accuracy ±0.7°C
JPt100 (2000°C f.s.)	Resolution 0.1°C; measurable −200°C to 500°C; accuracy ±0.9°C
Pt1000 (100°C f.s.)	Resolution 0.01°C; measurable −100°C to 100°C; accuracy ±0.5°C
Pt1000 (500°C f.s.)	Resolution 0.05°C; measurable −200°C to 500°C; accuracy ±0.7°C
Pt1000 (2000°C f.s.)	Resolution 0.1°C; measurable −200°C to 800°C; accuracy ±0.9°C
Resistance (4-wire; measurement current 1 mA)
10 Ω f.s.	Resolution 0.5 mΩ; measurable 0 Ω to 10 Ω; accuracy ±10 mΩ
20 Ω f.s.	Resolution 1 mΩ; measurable 0 Ω to 20 Ω; accuracy ±20 mΩ
100 Ω f.s.	Resolution 5 mΩ; measurable 0 Ω to 100 Ω; accuracy ±100 mΩ
200 Ω f.s.	Resolution 10 mΩ; measurable 0 Ω to 200 Ω; accuracy ±200 mΩ

Important: The LR8450 and LR8450-01 cannot perform measurement on their own; one or more plug-in units or wireless units are required (sold separately).

Important: The LR8450-01 and each wireless unit emit radio waves. Use of radio waves is subject to licensing requirements in certain countries. Using it in a country or region other than those indicated may violate the law and may result in legal penalties for the operator. For the latest information about supported countries and regions, please visit the Hioki website.

Important: Always use HIOKI optional storage media. Proper operation is not guaranteed when using storage media from other manufacturers, and may prevent the product from saving and loading data properly.

Important: Even in good wireless communication conditions (low interference), the sampling-timing between wireless devices may shift about 20 ms; in bad wireless conditions the shift will be much worse.

Important: The wireless unit buffer memory holds up to 5 min. of measurement data during a communications interruption; however, data collected using the Logger Utility software measurement cannot be restored in this manner.

Usage tip: pair the logger with HIOKI optional storage media (SD memory cards Z4001 or Z4003, or USB drive Z4006), as guaranteed save/load operation is specified with HIOKI media.

Important: Channels are isolated from each other with semiconductor relays. Never allow a voltage exceeding the product specifications (for example a lightning surge) to be applied across channels, as doing so may cause the semiconductor relays to short.

Important: Z3230 Wireless LAN Adapter: the LR8450/LR8450-01 instrument takes two adapters; each wireless unit takes one.

Recommended pairing: humidity measurement uses the HIOKI Z2000 Humidity Sensor together with the U8550, U8551, U8552, or LR8531 units.

About this New unit

This is a brand-new, factory-sealed unit, supplied exactly as it arrives from the manufacturer and backed by the full manufacturer warranty. For the exact configuration, available options, included accessories, or current lead time for your application, our Test Architects can confirm the details before you order.

ValueTronics supplies both new and used test and measurement equipment. New units ship factory-sealed, exactly as received from the manufacturer; every used unit is inspected and functionally verified in-house at our 20,000 sq ft secure facility in Elgin, Illinois before it ships. Our Test Architects can help you select the condition, calibration, and configuration that fit your application.

Please review the Manufacturer's Data Sheet to verify published specifications. Feedback on this webpage is always welcome — please reach out to your Test Architect at any time for questions or concerns. Thank you, we truly appreciate you being our customer.