Vaisala HMD70U Service Manual Page 15
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13
HMT338 Humidity and Temperature Transmitter
for Pressurized Pipelines
The Vaisala HUMICAP
®
Humidity and
Temperature Transmitter HMT338 is
designed for pressurized processes.
Insert or Remove Probe
While the Process is
Running
With “hot tapping”, the probe is
inserted directly into the process
while it is running, without the need
for venting or lowering the process
pressure.
The probe is screwed into a ball
valve assembly that has been fixed
to the process pipe or wall. The
adjustable hex nut is hand-tightened
to temporarily hold the probe to the
process. Then the probe is pushed
Features/Benefits
▪
Installed through ball valve
– can be inserted and removed
while the process is running
▪
Adjustable probe depth
▪
Pressure tolerance 40 bar
▪
For temperatures
-70 ... +180 °C (-94 ... +356 °F)
▪
Two probe lengths available
The HMT338 is ideal for installations in pressurized processes where the probe
needs to be removed while the process is running.
down to the appropriate depth. The
hex nut is tightened with a wrench
to lock the probe in its place. Hot
tapping is possible in pressures up to
10 bar.
Graphical Display of
History and Measurement
Trends
From the display, the user can
easily monitor operational data,
measurement trends and one-year
measurement history.
The optional data logger with
real-time clock makes it possible
to generate more than four years
of measured history, and zoom in
on any desired time or time frame.
The battery backup of the real-time
clock guarantees a reliable logging of
measured data.
Vaisala HUMICAP®
The HMT338 incorporates Vaisala’s
more than 30 years of experience in
industrial humidity measurement.
The sensor provides accurate and
reliable measurement and is immune
to particulate contamination and
most chemicals.
Technical Data
Temperature measurement range
-70 ... +180 °C (-94 ... +356 °F)
Operating pressure
0 ... 4MPa (0 ... 40 bar)
Accessories
Ball valve set BALLVALVE-1
Pressure fitting ISO 1/2 to NPT 1/2 210662
PC software + cable 215005
USB-RJ45 Serial Connection Cable 219685
Connection cable for HM70 211339
Wall mounting plate (plastic) 214829
Pole installation kit 215108
Rain shield 215109
DIN rail installation set 215094
Dimensions
Dimensions in mm (inches)
- HUMIDITY / DEW POINT / 1
- PRESSURE / WEATHER 1
- ACC URATE 2
- Humidity 4
- Dew Point 4
- Mounting Options 9
- Graphical Display of 10
- History and 10
- Measurement Trends 10
- Outputs and Power Supply 10
- Options for Every Need 10
- Flexible Installation 11
- For Moderate Humidities 11
- Vaisala HUMICAP® 12
- Performance 12
- Measurement Trends and 12
- Real Time History 12
- 41 (1.6) 13
- 51 (2.0) 13
- 192 (7.56) 13
- 253 (9.96) 13
- 37.5 (1.48) 14
- 79.5 (3.13) 14
- 99.5 (3.92) 14
- Temperature Transmitters 16
- HMP361 for wall mounting 17
- HMP363 for confined spaces 17
- HMP364 for high pressure 17
- HMP365 for high temperature 18
- HMP367 for high humidities 18
- HMP368 for pressurized 18
- Transmitter 22
- Interchangeable Probe 24
- Fast, On-Site Calibration 26
- Measures both Humidity 26
- Resistant to Chemicals 28
- Vaisala INTERCAP 30
- Humidity and Temperature 30
- Transmitter Series HMW80 30
- HVACApplications 32
- Demanding Applications 34
- Unique Warmed Probe 34
- Vaisala HUMICAP® Sensor 34
- Chambers 36
- Probe HMP60 38
- Vaisala HUMICAP 40
- Probe HMP110 40
- Three Probes 42
- MI70 Link 42
- Reliable and Cost-ecient 47
- HVAC Products 47
- Fast and Easy-to-Use 48
- HMK15 Humidity Calibrator 50
- DTR500 Solar Radiation 54
- Versatile Outputs and 61
- (Wireless) Data Collection 61
- Easy Installation 61
- Probe Specifications 62
- Ensure dry 65
- Measure Humidity Directly 66
- DMT345, Accurate in Hot 66
- OEM Applications 70
- Low Maintenance 72
- Dewpoint temperature (°C) 75
- DMT132 Dewpoint Transmitter 76
- DEW POINT 77
- CALCULATED VARIABLES 77
- Indoor Applications 78
- 110 (4 .33) 79
- 85 (3.35) 79
- 33 (1.30) 79
- DSS70A Portable 82
- Sampling System 82
- Sampling Cells for 82
- Pressurized Processes 82
- Online Reliability 86
- Savings Across the Board 86
- Risk-Free, Greener 86
- Solution 86
- The Fruit of Experience 86
- Multiparameter Transmitter 88
- When Moisture is a Problem 89
- Knowledge is Power 89
- Literally 89
- Transmitter Series for Oil 90
- Moisture in Oil 90
- The Vaisala HUMICAP 91
- Hand-Held 91
- R1/2" ISO7/1 92
- Prevent it 95
- Transmitter for Oil 96
- Features/Benefits 100
- Technical Data 101
- 0 ... 2 % 102
- Interchangeable Probes 104
- Demanding OEM Applications 106
- GMM111 Carbon Dioxide Module 108
- Vaisala CARBOCAP 110
- Technology 110
- Two Sampling Methods 110
- Features/Benefi ts 112
- Demand-controlled Ventilation 114
- GMM112 Carbon Dioxide Module 118
- GMM20W Carbon Dioxide Module 120
- Pressure 122
- PTU300 Models 123
- Mechanics 126
- Accessories 126
- Dimensions 126
- IN CONTROLLED ENVIRONMENTS 127
- Take the Lab to the Field 130
- For more information, visit 131
- Standard PTB330TS 132
- PTB210 Digital Barometer 134
- Calculate 137
- Vaisala BAROCAP® 138
- Accuracy and Stability 138
- Applications 138
- Ideal for outdoor 140
- Carefree maintenance 140
- Operating Environment 142
- Available Options 142
- Figure 1 143
- Figure 2 with Process 143
- Valve Actuator and 143
- Test Jacks 143
- Measuring Acoustic 146
- Precipitation 146
- Wind Measurement 150
- Vaisala Service Offering 152
- Accredited Body 153
- Accredited Parameters 153
- Vaisala Filters 154
- Vaisala Filters continued 155
- Vaisala Contact Information 158
- ASIA AND PACIFIC 159
- NORTH AMERICA 159
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