Water activity measurement

Measurement range a_w
Accuracy
     0 ... 0.9
     0.9 ... 1.0
Sensor

0 ... 1

±0.02
±0.03
Vaisala HUMICAP^®

Operating environment

Operating temperature
     for probes
     for transmitter body
     with display
Pressure range for probes
     MMT332
     MMT337
     MMT338
Complies with EMC standard

-40 ... +180 °C (-40 ... +356 °F)
-40 ... +60 °C (-40 … +140 °F)
+0 ... +60 °C (+32 … +140 °F)

0 ... 250 bar (0 ... 3625 psia)
0 ... 10 bar (0 ... 145 psia)
0 ... 40 bar (0 ... 580 psia)
EN61326-1:1997 + Am1:1998 + Am2:2001; Industrial Environment

Inputs and outputs

Operating voltage
     with optional power supply module
Power consumption @ 20 °C
(U_in 24VDC)
     RS-232
     U_out 2 x 0 ... 1V / 0 ... 5V / 0 ... 10V
     I_out 2 x 0 ... 20 mA
     display and backlight
Analog outputs
(2 standard, 3rd optional)
     current output
     voltage output
Digital outputs
Relay outputs

Optional data logger with
real-time clock
     Logged parameters
     Logging interval
     Max. logging period
     Logged points
     Battery lifetime

Ethernet interface (optional)
     Supported standards
     Connector
     Protocols
WLAN interface (optional)
     Supported standards
     Antenna connector type
     Protocols
     Security
Authentication / Encryption
     Open / no encryption
     Open / WEP
     WPA Pre shared key / TKIP
     WPA Pre shared key / CCMP (a.k.a. WPA2)

Display

Display menu languages

10 ... 35 VDC, 24 VAC
100 ... 240 VAC 50/60 Hz


max. 25 mA
max. 25 mA
max. 60 mA
+20 mA


0 ... 20 mA, 4 ... 20 mA
0 ... 1 V, 0 ... 5 V, 0 ... 10 V
RS-232, RS-485 (optional)
0.5 A, 250 VAC, SPDT, Potential Free (optional)



max. three with trend/min/max values
10 sec (fixed)
4 years 5 months
13,7 million points per parameter
min. 5 years


10/100Base-T
RJ45
Telnet

802.11b
RP-SMA
Telnet
WEP 64/128,WPA







LCD with backlight, graphic trend display of any parameter
English, French, Spanish, German, Japanese, Russian, Swedish, Finnish, Chinese

Mechanics

Probe cable length
Housing material
Housing classification

Probe cable lengths 2 m, 5 m or 10 m
G-AlSi 10 Mg (DIN 1725)
IP 65 (NEMA 4X)

Options and accessories

Mounting kits

Wall Mounting Kit
DIN Rail Installation Kit
Installation Kit for Pole or Pipeline
Mounting Rain Shield

Calibration services

Calibrated quantities
Traceability

relative humidity, temperature
NIST

Calibration services are available at Vaisala service centers for a fixed price.
-Factory calibrations (ISO9001)

Calibration price includes:
-calibration and certificate before adjustment
-adjustment to meet specifications
-calibration and certificate after adjustment
-replacement of wearing parts

Spare parts

Common spare and wearing parts are available. For availability contact sales.

Repair

Repair services are available at Vaisala service centers for a fixed price.

Repair price includes:
-repair work
-required parts
-calibration certificate
-service report

Technical support

Technical support for your installed units, contact helpdesk@vaisala.com.