GENEQ > Essais sur Matériaux > Humidité dans l'huile

Appareil portatif de mesure de l'humidité et de la température de l'huile
Modèle MM70


The MM70 is an ideal tool for the preventive maintenance of oil-filled systems. The water activity measurement indicates the margin to free water formation, which causes severe problems in lubrifications systems. The HUMICAP handheld moisture meter for oil MM70 enables reliable detection of moisture in oil.

FEATURES & BENEFITS
  • Measurement independent of oil type, age and temperature
  • In-line process checking through ball valve, no need to drain the oil
  • Ruged and reliable construction
  • Excellent pressure and temperature tolerance
  • Data can be logged and transferred to a PC
  • Vaisala HUMICAP Sensor - proven field performance since 1973
  • Compatible with Vaisala's fixed oil moisture instruments
  • Temporary outdoor logging possible with carrying case
  • No reference oil needed for recalibration

IN-LINE PROCESS CHECKING THROUGH BALL VALVE
The probe can be inserted directly into the process pipe through a ball valve without draining the oil in the system.

WATER ACTIVITY MEASUREMENT
The MM70 measures moisture in oil in terms of the water activity (aw) and temperature (T). Water activity directly indicates whether there is a risk of free water formation. The measurement is independent of oil type, age and temperature.

NUMERICAL AND GRAPHICAL DISPLAY
The MM70 features a multilingual, menu-based user interface and a backlit LCD display. The measurement parameters can be numerically and graphically displayed and logged into the meter's memory at the same time. An analog output option is also available.

CONNECTION TO PC
The optional MI70 Link Windows software is used to transfer logged data and real time measurement data from the MM70 to a PC.

PROVEN VAISALA HUMICAP TECHNOLOGY
The MM70 incorporates the latest generation of the Vaisala HUMICAP Sensor, developed for demanding moisture measurements in liquid hydrocarbons. The sensor's excellent chemical tolerance provides accurate and reliable measurement over the measurement range.

SPEEDY SERVICE - ONCE A YEAR
The meter can be recalibrated by sending the probe to Vaisala Service, or customers can calibrate the instrument themselves using a standard relative humidity calibration.

MULTI-PROBE OPERATION
One or two probes can be connected simultaneously. Maintenance teams can use additional Vaisala dewpoint or relative humidity probes for other tasks. For example, a dewpoint probe is ideal for checking the moisture inside washed and dried oil tanks.

SPECIFICATIONS
Performance
Water Activity
Measurement range 0 to 1 aw
Accuracy (including nonlinearity, hysteresis and repeatability) when calibrated agaisnt salt solutions (ASTM E104-85) ±0.02 (0 to 0.9)
±0.03 (0.9 to 1.0)
Accuracy (including nonlinearity, hysteresis and repeatability) maximem achievable accuracy when calibrated against high quality, certified humidity standards ±0.01 (0 to 0.9)
±0.02 (0.9 to 1.0)
Response time (90%) 10 min. (at 20°C) in still oil with stainless steel filter
Sensor Vaisala HUMICAP
Recommended recalibration interval 1 year
Temperature
Measurement range -40 to 100°C (-40 to 212°F)
Typical accuracy at 20°C ±0.2°C (±0.36°F)
Typical temp. dependence of electronics ±0.005°C/°C (±0.005°F/°F)
Sensor Pt 100 IEC 751 1/3 class B
Typical long-term stability better than 0.001 aw/year
Operating Environment
Probe
Operating temp. for electronics -40 to 60°C (-40 to 140°F)
Operating pressure range Max. 20 bar
Max. 10 bar (during installation through ball valve)
Oil flow range Max. 1 m/s
Indicator
Operating temp. range -10 to 40°C (14 to 104°F)
Operating humidity range non-condensing
Electromagnetic compatibility
Complies with EMC standard EN61326-1:1997 + Am1:1998, Electrical equipment fr measurement, control and laboratory use - EMC requirements: Portable test and measurement.
Inputs and Outputs
Power supply Rechargeable NiMH battery pack with AC-POWER or 4 x AA-size alkalines, type IEC LR6
Battery operation time continuous use 48 hours typical at 20°C (68°F)
Battery operation time datalogging use Up to 31 days
Menu languages English, French, Spanish, German, Sweidish, Finninsh
Display LCD with backlight, graphic trend display of any parameter character hight up to 16mm
Analog output 0 to 1 VDC
Output resolution 0.6 mV
Data interface RS232
Datalogging capacity 2700 points
Alarm Audible alarm function
Mechanics
Probe
Housing classification IP65 (NEMA 4)
Housing material ABS/PC blend)
Probe material Stainless steel (AISI316L)
Cable length between probe and indicator 1.9m (10m extension available)
Weight 506g
Indicator
Housing classification IP54
Weight 400g
Probe inputs 1 or 2

CAT. NO. DESCRIPTION
VAMM70-000 Handheld moisture and temperature meter for spot-checking in oil
Probes
VAHM75-000 Relative humidity measurement probe model HM75
VAHM76-000 Relative humidity measurement probe model HM76
VAHM77-000 Relative humidity measurement probe model HM77
VADMP74A/B Dewpoint measurement probes
Options and accessories
VAMI70CASE2 Carrying case
VAHMP228BVS Ball valve set (incl. fitting body and blanking plug)
VA213017SP Probe cable extension, 10m
VA27159ZZ Transmitter connection cable for HMP228
VADRW216050 Transmitter connection cable for MMT318
VA27168ZZ- Analog output cable
VAMI70LINK Windows software, inclides PC connection cable
VAHM47453SP Sensor protection