BL621 High Precision Reference Thermometer (±5ppm)

The BL621 is a compact size, highly rugged and robust high precision reference thermometer.

The BL621 perfectly works with SPRTs or IPRTs probes. It delivers exceptional accuracy, wide measurement range with   logging and trending all in a handheld tool. The meter uses resistance ratio topology with a builtin temperature compensated reference that normally has only been seen in high-end resistance bridges. To achieve a super low noise level and high-accuracy measurement, the BL621 also uses the thermal EMF canceling technique (Real AccT®) to remove EMF from measurements, allowing BL621 to reach a new level of short and long term stability.

FEATURES

• High accuracy: up to ±1mK Full range*

• High resolution: 0.1mK

• Thermal Electromotive Force (EMF) canceling with Real AccT®

• Fast updating rate: up to 0.4s

• Flexible sensor selection: 25 ohm and 100 ohm Standard PRT probes, industrial PRT probes

• Supports ITS-90 and CVD coefficients

• Smart Probe with auto-load parameter

• Data logging

• Built-in Probe Library

• SCPI protocol supported

APPLICATION

• Secondary laboratory calibration

• Laboratory, education, research testing

• Industries: chemical, pharmaceuticals and cosmetics; food and beverage; petroleum industry; renewable energy applications

SPECIFICATION

• Temperature measuring range: -200 °C to +780 °C***

• Temperature resolution: 0.1mK

• Temperature accuracy**: ±1mK (Pt 25 , PT 100), ±20mK (Pt 1000)

• Resistance measuring range: 0 Ω to 400 Ω, 400 Ω to 3400 Ω,

• Resistance resolution:   < 50μΩ

• Resistance accuracy: ±0.0001 Ω (0...25Ω), ±5 ppm (25...400 Ω)

• Channels: 2

• Sensor types：SPRT, IPRT

• Sensor connection: 4-wire #

• Excitation current: 0.5mA

• Number of sensor inputs: 2

• Measuring time: 0.4 seconds

• Data output interface: USB

• Display units: °C, °F, K, Ω

• Communication protocol: SCPI or customized

• Operating condition: -10°C to 35°C (for highest accuracy, 10°C to 30°C recommended; wider temperature range upon request)

• Power: lithium Iron battery cell (USB-C 5V 3A max  rapid charging).

• Power on stabilizing time: 60 seconds (max)

• Battery life: 72 hours (24-7 working continuously with Working-While-Charging® Technique)

• Custom Sensor calibration data：Up to 18 calibration values can be stored, 60 with optional multiplexer

• Dimension: 180 mm × 85 mm × 35 mm

• Weight: 625 g

• Data logging memory: 16MB

• Logging intervals: from 1 second to 60 seconds

• Enclose rating: IP65

*    BL621 reference thermometer only, accuracy of the connected probe or sensor is not counted.

** Refers to the calibration of the reference resistor without contribution of the sensor (confidence level: 95 %, number of measurement values: 50, reference temperature: 23 °C)

*** For PT100

#   Default   Setting

SCOPE OF DELIVERY

• BL621 High precision reference thermometer

• 4-wire binding post connection adapter x 1pc

• Protection case

OPTIONAL ACCESSORIES AND SERVICE

• ISO17025 accredited calibration (SN: CAL-621)

• 4-wire binding post connection adapter

ORDERING MODEL NUMBER

• BL621