www.vaisala.com MMT310 Series Moisture and Temperature Transmitter for Oil Water content as ppm calculation for transformer oils PPM units are traditionally used in transformer applications. They indicate the average mass concentration of water in oil. The ppm calculation for mineral oil based transformer oil is optional in the MMT310 series. Diverse applications and demanding conditions The MMT310 series can be used in lubrication and hydraulic systems as well as in transformers. It can be used for on-line moisture monitoring and as a control function, allowing separators and oil purifiers to be started only when necessary. Two probe options: MMT317 and MMT318 Features/Benefits ▪ Continuous measurement of moisture in oil ▪ Proven Vaisala HUMICAP® sensor, 10 years in oil applications ▪ Measurements in lubrication, hydraulic and transformer oils ▪ Excellent pressure and temperature tolerance ▪ Measuring water activity - ppm calculation for transformer oil ▪ ▪ ▪ Small size, easy to integrate NIST traceable calibration Applications: e.g. monitoring of transformer oil and of lubrication systems in marine and paper industry The Vaisala HUMICAP® Moisture and Temperature Transmitter Series for Oil MMT310 is a fast and reliable online detector for moisture in oil. Reliable Vaisala HUMICAP® technology The MMT310 series incorporates the latest generation of the Vaisala HUMICAP® Sensor, developed for demanding moisture measurement in liquid hydrocarbons. The sensor’s excellent chemical tolerance provides accurate and reliable measurement over the wide measurement range. Measuring water activity The MMT310 series measures moisture in oil in terms of the water activity (aw) and temperature (T). Water activity directly indicates if there is a risk of free water formation. The measurement is independent of oil type, age, and temperature. Installation options The MMT318 has two adjustable probe lengths. The transmitter can be ordered with a ball valve set that enables the insertion and removal of the moisture probe for calibration, without the need to empty the oil system. The MMT317 has a small pressuretight probe with optional Swagelok fittings. Several outputs, one connector The MMT310 series has two analog outputs and an RS-232 serial output. The output signals and the supply power travel in the same cable, the only cable connected to the unit. Technical data Measured values General Water activity Measurement range aw Accuracy (including non-linearity, hysteresis and repeatability) 0 ... 0.9 0.9 ... 1.0 Response time (90 %) at +20 ˚C in still oil (with stainless steel filter) Sensor 0 ... 1 ±0.02 ±0.03 10 min Vaisala HUMICAP® Temperature Measurement range Typical accuracy at +20 ˚C Typical temperature dependence of electronics Sensor -40 ... +180 ˚C (-40 ... +356 ˚F) ±0.1 ˚C (±0.18 ˚F) ±0.05˚C/ ˚C (±0.005 ˚F/˚F) Pt100 IEC751/3 class B Electrical connections Two analog outputs, selectable and scalable 0 ... 20 mA or 4 ... 20 mA Typical accuracy of analog output at +20 ˚C ±0.05 % full scale Typical temperature dependence 0.005 %/˚C (0.003 %/˚F) of analog output full scale Serial output RS-232C Connections 8-pole connector with RS-232C, current outputs (two channels) and Uin Operating voltage Uin 24 VDC (10 ... 35 VDC) Minimum operating voltage Uin with RS-232C 10 VDC 11 VDC + (Rload/60) VDC Iout 0 ... 20 mA, 4 ... 20 mA Power consumption at +20 ˚C, Uin = 24 VDC with RS-232C 20 mA 60 mA Iout 2 x 0 ... 20 mA For more information, visit www.vaisala.com or contact us at [email protected] Operating temperature range for electronics -40 ... +60 ˚C (-40 ... +140 ˚F) Storage temperature -55 ... +80 ˚C (-67 ... +176 ˚F) Pressure range for MMT318 with ball valve up to 120 ˚C 0 ... 40 bar Pressure range for MMT317 0 ... 10 bar External load R1<500 Ohm Material transmitter housing G-AlSi 10 Mg transmitter base ABS/PC Housing classification IP65 to be protected from direct rain Cable feed through alternatives 8-pole connector with 5 m cable, female 8-pin connector screw joint for cable diameter 4 ... 8 mm Sensor protection stainless steel grid Probe cable length MMT317 0.5, 2, 5 or 10 meters MMT318 2, 5 or 10 meters Probe installation MMT317 NPT 1/2”, ISO 3/8” or ISO 1/2” Swagelok® Probe installation MMT318 Fitting bodies ISO 1/2”, NPT 1/2” Ball Valve Set BALLVALVE-1 Complies with EMC standard EN61326-1, Industrial environment Note: When using the current output, the RF field susceptibility level according to standard EN61000-4-3 with a frequency band of 110 ... 165 MHz, is only 3 V/m (generic environment) with the specified accuracy. HUMICAP® is a registered trademark of Vaisala. Ref. B210831EN-A ©Vaisala 2009 This material is subject to copyright protection, with all copyrights retained by Vaisala and its individual partners. All rights reserved. Any logos and/or product names are trademarks of Vaisala or its individual partners. The reproduction, transfer, distribution or storage of information contained in this brochure in any form without the prior written consent of Vaisala is strictly prohibited. All specifications — technical included — are subject to change without notice.