Vaisala HMT310 Technical data

HMT310 Humidity and Temperature Transmitter

www.vaisala.com

The Vaisala HUMICAP

(from left to right): HMT313, HMT317, HMT314, HMT318, HMT315 and HMT311.

Features/Beneﬁts

Next-generation Vaisala

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HUMICAP® Sensor for excellent accuracy and stability

Full 0 ... 100 %RH

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measurement, temperature range up to +180 °C (depending on model)

Small size, easy to integrate

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Insensitive to dust and most

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chemicals

NIST traceable

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Humidity and Temperature Transmitter HMT310 models

Reliable Vaisala HUMICAP® technology

The HMT310 incorporates the latestgeneration Vaisala HUMICAP® Sensor. The Vaisala HUMICAP® Sensor is a capacitive thin-lm polymer sensor. It features high accuracy, excellent long-term stability and negligible hysteresis. It is insensitive to dust, particulate dirt and most chemicals.

Several outputs, one connector

The HMT310 is powered up with 12 ... 35 VDC. It has two analog outputs and an RS-232 serial output. The output signal and the supply power travel in the same cable, the only cable connected to the unit.

Chemical purge

Chemical purge helps to maintain measurement accuracy between calibraton intervals and it involves heating the sensor to remove harmful chemicals. The function can be initiated manually or programmed to occur at set intervals.

Optional functions

The following optional functions are available: several probes for various applications, calculated humidity quantities, different mounting kits, sensor protection options and probe cable lengths, warmed probe and sensor heating for high humidity conditions (HMT317), and chemical purge for applications risking an interference with chemicals in the measuring environment.

Technical data

°C

-0.7

0.7

0.6

0.5

0.4

0.3

0.2

0.1

-0.1

-0.2

-0.3

-0.4

-0.5

-0.6

0-60 -40 -20 20 40 60 80 100

120

140

160

180

-80

Measured values

RELATIVE HUMIDITY

Measurement range 0 ... 100 %RH Sensor

Vaisala HUMICAP Vaisala HUMICAP

Accuracy (incl. non-linearity, hysteresis and repeatability) at a temperature range of

+15 ... +25 °C ±1 %RH (0 ... 90 %RH)

-20 ... +40 °C ±(1.0 + 0.008 x reading) %RH

-40 ... +180 °C ±(1.5 + 0.015 x reading) %RH Factory calibration uncertainty (+20 °C)

* Deﬁned as ±2 standard deviation limits. Small variations possible, see also calibration certificate.

Response time (90 %) at +20 °C 17 s with grid ﬁlter in 0.1 m/s air ﬂow 50 s with grid and steel, netting ﬁlter

TEMPERATURE

HMT311 -40 ... +60 °C (-40 ... +140 °F) HMT313 -40 ... +80 °C (-40 ... +176 °F)

HMT314, HMT315, HMT317, HMT318 -70 ... +180 °C (-94 ... +356 °F)

Accuracy over temperature range (see graph below)

180R typical applications

180RC applications with chemical

purge and/or warmed probe

±1.7 %RH (90 ... 100 %RH)

±0.6 %RH (0 ... 40 %RH)*

±1.0 %RH (40 ... 97 %RH)*

60 s with sintered ﬁlter

or -40 ... +120 °C (-40 ... +248 °F)

Electrical connections

Two analog outputs, selectable and scalable Typical accuracy of analog output at +20 °C Typical temperature dependence of analog output Serial output RS--232C Connections M12 8-pole connector with RS-232C,

current outputs (two channels) and U

Operating voltage 12 ... 35 VDC, the maximum

operating voltage for a device with

Power consumption 30 mA with RS-232 External load R Startup time after powerup 3 s

0 ... 20 mA or 4 ... 20 mA

+0.05 % full scale

0.005 %/°C (0.003 %/°F) of full scale

sensor heating is 24 VDC

< 500 Ohm

General

Operating temperature range for electronics -40 ... +60 °C (-40 ... +140 °F)

Storage temperature range -55 .... +80 °C (-67 ... +176 °C)

Operating pressure

HMT314 0 ... 100 bar HMT318 0 ... 40 bar

HMT315, HMT317 vapor tight Transmitter housing material G-AlSi10Mg Transmitter base material ABS/PC Housing classiﬁcation IP65 Cable feed through alternatives

Sensor protection PPS grid with stainless steel net,

Complies with EMC standard EN61326-1, Industrial environment

8-pole connector with 5 m cable,

Female 8-pin connector screw joint for

cable diameter 4 ... 8 mm

PPS grid, Sintered ﬁlter

Membrane stainless steel ﬁlter

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 3V/m (generic environment) with the speciﬁed accuracy.

Typical temperature

+0.05 °C/°C (+0.005 °F/°F) dependence of electronics Temperature sensor Pt100 IEC751/3 class B

For more information, visit www.vaisala.com or contact us at sales@vaisala.com

HUMICAP® is a registered trademark of Vaisala.

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.