BL765 Relative Humidity Generator (5~95%RH)
The BL765 is a bench-top relative humidity generator for calibrating a large workload of probes in the laboratory or on site in the field. The system comprises a humidity and temperature controlled chamber that can house up to six humidity sensors. The BL765 works by time-proportioning the flows of dry and saturated air according to the pre-selected relative humidity value. The chamber temperature is controlled by a four-zone Peltier heat pump arrangement for maximum stability and minimum temperature gradient. The saturator assembly can be filled easily with the distilled water reservoir at the front of the unit and the easily accessible desiccator can be re-charged by heating when required.
FEATURES
5%-95%RH humidity range, temperature range 5℃-50℃
Better than ±0.5%RH and 0.1℃ uncertainty for dependable humidity probe calibration
Rapid humidity and temperature stabilization time, much faster than traditional two-pressure generator.
2.4L chamber, 1.6L effective work volume
Program 6 multi-points calibration
Compact size and lightweight
Modular design, maintenance free
Touch screen operation
APPLICATION
Test and calibration laboratory
Pharmaceutical and biomedicine
Automobile manufacturing industry
Food industry
Dust free workshop
Youtube video https://youtu.be/JygbjFxTeL0
SPECIFICATION
Control sensor: HygroClip2-S, PT100
Humidity measurement range: 5…95%RH @23±2℃
Temperature measurement range: 5 … 50 ℃ (Environment temperature is not more than 23 ± 1℃ while chamber temperature is set at 5℃ )
Humidity stability: < ±0.1%RH
Temperature stability: < ±0.02℃
Humidity ramp/soak changes: < 10 minutes (5…95%RH)
Temperature changes: < 10 minutes (20 to 50℃), < 20 minutes (20 to 5℃)
Typical calibration uncertainty (k=2): ±0.5 %RH @ 20℃, ±0.10℃ @ 5…95%RH
Uniformity: ±0.3%RH @ 23℃, ±0.10℃ @ 23℃
Resolution: ±0.1%RH, ±0.1℃
Ports size on the door: 1xΦ12, 7xΦ15, 2xΦ30, 2xΦ50mm
Maximum Calibration probes: 8 pcs
Water level observation: Front panel window
Request water: 80ml – 120ml distilled water
Gas connection: Input and output on rear side
Desiccant type: Molecular Sieve (screen shows lack)
Chamber volume: 2.4L, effective working volume is 1.6 L (14 cm x Φ12cm )
Communication ports: RS485
Power supply: 220VAC 60Hz 3A (110V is optional)
Dimension: 475mm L x 360mm W x 240mm D
Weight: 15 kg
Operation environment: 10°C to 35°C, < 80%RH
SCOPE OF DELIVERY
BL765 Humidity generator
Square door with 8 ports (1xΦ12, 7xΦ15, 2xΦ30, 2xΦ50mm)
Desiccant cartridge
Fill syringe
Power cord
User manual
Metal Carrying case with wheels and handle
OPTIONAL ACCESSORIES AND SERVICES
ISO17025 accredited calibration certificate (CAL-765)
Desiccant cartridge with desiccant material (765-DC)
Transparent window for transmitter w/o probe (765-TW)
Door with custom ports from Φ6mm to Φ50mm (765-CP)
ORDERING MODEL NUMBER
BL765-220V
BL765-110V
Direct calibrate the UUTs
Examples:
Work with ±0.20% ℃ DP Chilled Mirror Hygrometer
Examples:
Work with ±0.15% ℃ DP Chilled Mirror Hygrometer
Examples:
Work with ±0.10% ℃ DP Chilled Mirror Hygrometer
Examples:
Customer reference:
Shanghai Academy of Spaceflight Technology http://www.sast.spacechina.com/
Shanghai Centre Testing International https://www.cti-cert.com/en/
China National Environmental Monitoring Centre https://www.cnemc.cn/en/
China Meteorological Administration https://www.cma.gov.cn/en/
Xichang Satellite Launch Center https://english.spacechina.com/
Do you have recomendation for communication software?
We recommend PuTTY.
PuTTY is a communications tool for running interactive command-line sessions on other computers, usually via the SSH protocol. It can also communicate over a serial port, or speak various legacy Internet protocols such as Telnet.
If necessary, please also download the driver of USB cable.
What is the accuracy of internal control sensor?
The error tolerance of standard control sensor is ±0.8%RH.
Also, the more accurated ±0.6%RH sensor is available, extra cost will be charged.
What is reference standard of BL765?
The BL765 humidity generator can generate a uniform and stable temperature and humidity environment in its chamber. In general, the BL765 can refer the following methods as humidity reference standard:
Internal control humidity sensor
External high precision humidity probe
External chilled mirror hygrometer
External standard platinum resistance thermometer (SPRT)
Each methods has its pros and cons, user could select the most reliable reference standard as per the actual measurement requirements.
N.B: It is very important to compare the temperature of reference standard, BL765 humidity generator itself, and the unit under test (UUT). To get a very accurate humidity test value, the temperature uncertainty should be optimized firstly. Humidity uniformity is based on temperature uniformity because water molecules in air (water vapor) evenly disperse in a closed system unless temperature is not uniform. Also, since relative humidity (RH) is the percent of water vapor saturation at a particular temperature, it varies with air temperature.
How to measure the 5%RH precisely?
The 5%RH is not easy to get a precised measurement results. It is recommended to use an external air pump to assist the humidity control. And, it will be better to input the whole UUT sensor inside of test chamber.