Campbell Scientific HMP155A User Manual
INSTRUCTION MANUAL
HMP155A Temperature
Copyright © 1990- 2014
Campbell Scientific, Inc.
and Relative Humidity Probe
Revision: 5/14
Limited Warranty
“Products manufactured by CSI are warranted by CSI to be free from defects in
materials and workmanship under normal use and service for twelve months
from the date of shipment unless otherwise specified in the corresponding
product manual. (Product manuals are available for review online at
www.campbellsci.com.) Products not manufactured by CSI, but that are resold
by CSI, are warranted only to the limits extended by the original manufacturer.
Batteries, fine-wire thermocouples, desiccant, and other consumables have no
warranty. CSI’s obligation under this warranty is limited to repairing or
replacing (at CSI’s option) defective Products, which shall be the sole and
exclusive remedy under this warranty. The Customer assumes all costs of
removing, reinstalling, and shipping defective Products to CSI. CSI will return
such Products by surface carrier prepaid within the continental United States of
America. To all other locations, CSI will return such Products best way CIP
(port of entry) per Incoterms ® 2010. This warranty shall not apply to any
Products which have been subjected to modification, misuse, neglect, improper
service, accidents of nature, or shipping damage. This warranty is in lieu of all
other warranties, expressed or implied. The warranty for installation services
performed by CSI such as programming to customer specifications, electrical
connections to Products manufactured by CSI, and Product specific training, is
part of CSI's product warranty. CSI EXPRESSLY DISCLAIMS AND
EXCLUDES ANY IMPLIED WARRANTIES OF MERCHANTABILITY
OR FITNESS FOR A PARTICULAR PURPOSE. CSI hereby disclaims,
to the fullest extent allowed by applicable law, any and all warranties and
conditions with respect to the Products, whether express, implied or
statutory, other than those expressly provided herein.”
Assistance
Products may not be returned without prior authorization. The following
contact information is for US and international customers residing in countries
served by Campbell Scientific, Inc. directly. Affiliate companies handle
repairs for customers within their territories. Please visit
www.campbellsci.com to determine which Campbell Scientific company serves
your country.
To obtain a Returned Materials Authorization (RMA), contact CAMPBELL
SCIENTIFIC, INC., phone (435) 227-9000. After an application engineer
determines the nature of the problem, an RMA number will be issued. Please
write this number clearly on the outside of the shipping container. Campbell
Scientific’s shipping address is:
CAMPBELL SCIENTIFIC, INC.
RMA#_____
815 West 1800 North
Logan, Utah 84321-1784
For all returns, the customer must fill out a “Statement of Product Cleanliness
and Decontamination” form and comply with the requirements specified in it.
The form is available from our web site at www.campbellsci.com/repair. A
completed form must be either emailed to repair@campbellsci.com or faxed to
(435) 227-9106. Campbell Scientific is unable to process any returns until we
receive this form. If the form is not received within three days of product
receipt or is incomplete, the product will be returned to the customer at the
customer’s expense. Campbell Scientific reserves the right to refuse service on
products that were exposed to contaminants that may cause health or safety
concerns for our employees.
Precautions
DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND
TRIPODS, TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES,
ANTENNAS, ETC. FAILURE TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS,
TOWERS, AND ATTACHMENTS, AND FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS
INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE. TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS.
CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE
EQUIPMENT PRIOR TO PERFORMING ANY WORK.
Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design
limits. Be familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com or
by telephoning 435-227-9000 (USA). You are responsible for conformance with governing codes and regulations, including safety
regulations, and the integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation
sites should be evaluated and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or
maintenance of tripods, towers, attachments, or electrical connections, consult with a licensed and qualified engineer or electrician.
General
• Prior to performing site or installation work, obtain required approvals and permits. Comply
with all governing structure-height regulations, such as those of the FAA in the USA.
• Use only qualified personnel for installation, use, and maintenance of tripods and towers, and
any attachments to tripods and towers. The use of licensed and qualified contractors is highly
recommended.
• Read all applicable instructions carefully and understand procedures thoroughly before
beginning work.
• Wear a hardhat and eye protection, and take other appropriate safety precautions while
working on or around tripods and towers.
• Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take
reasonable precautions to secure tripod and tower sites from trespassers.
• Use only manufacturer recommended parts, materials, and tools.
Utility and Electrical
• You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are
installing, constructing, using, or maintaining, or a tool, stake, or anchor, come in contact with
overhead or underground utility lines.
• Maintain a distance of at least one-and-one-half times structure height, or 20 feet, or the
distance required by applicable law, whichever is greater, between overhead utility lines and
the structure (tripod, tower, attachments, or tools).
• Prior to performing site or installation work, inform all utility companies and have all
underground utilities marked.
• Comply with all electrical codes. Electrical equipment and related grounding devices should
be installed by a licensed and qualified electrician.
Elevated Work and Weather
• Exercise extreme caution when performing elevated work.
• Use appropriate equipment and safety practices.
• During installation and maintenance, keep tower and tripod sites clear of un-trained or non-
essential personnel. Take precautions to prevent elevated tools and objects from dropping.
• Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.
Maintenance
• Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks,
frayed cables, loose cable clamps, cable tightness, etc. and take necessary corrective actions.
• Periodically (at least yearly) check electrical ground connections.
WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS,
THE CUSTOMER ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR
MAINTENANCE OF TRIPODS, TOWERS, OR ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS,
ENCLOSURES, ANTENNAS, ETC.
Table of Contents
PDF viewers: These page numbers refer to the printed version of this document. Use the
PDF reader bookmarks tab for links to specific sections.
1. Introduction ................................................................. 1
2. Cautionary Statements ............................................... 1
3. Initial Inspection ......................................................... 1
3.1 Ships With ............................................................................................ 2
4. Quickstart .................................................................... 2
4.1 Assembly and Mounting ...................................................................... 2
4.2 Use SCWin to Program Datalogger and Generate Wiring Diagram .... 5
5. Overview ...................................................................... 7
6. Specifications ............................................................. 8
6.1 Temperature Sensor ........................................................................... 10
6.2 Relative Humidity Sensor .................................................................. 11
7. Installation ................................................................. 11
7.1 Siting .................................................................................................. 11
7.2 Wiring ................................................................................................ 11
7.3 Datalogger Programming ................................................................... 13
7.4 Long Lead Lengths ............................................................................ 14
7.5 Absolute Humidity ............................................................................. 15
8. Sensor Maintenance ................................................. 16
8.1 Periodic Maintenance ......................................................................... 16
8.1.1 Cleaning ...................................................................................... 16
8.1.2 Changing the Probe Filter ........................................................... 16
9. Troubleshooting........................................................ 17
10. References ................................................................ 18
Appendices
Importing Short Cut Code ...................................... A-1
A.
A.1 Importing Short Cut Code into a Program Editor ........................... A-1
A.1.1 CRBasic Datalogger ................................................................. A-1
A.1.2 Edlog ........................................................................................ A-2
i
Table of Contents
B. Example Programs .................................................. B-1
B.1 Single-Ended Voltage Measurement Examples .............................. B-1
B.1.1 CRBasic Single-Ended Measurement Program ........................ B-1
B.1.2. Edlog Single-Ended Measurement Program ............................ B-2
B.2 Differential Measurement Examples ............................................... B-3
B.2.1 CRBasic Differential Measurement Program ........................... B-3
B.2.2 Edlog Differential Measurement Program ............................... B-4
B.3 Mean Vapor Pressure Examples ...................................................... B-5
B.3.1 CRBasic Vapor Pressure and Saturation Vapor Pressure
Program ................................................................................ B-5
B.3.2 Edlog Vapor Pressure and Saturation Vapor Pressure
Program ................................................................................ B-6
C. Interfacing with HMP155A RS-485 Output ............ C-1
C.1 RS-485 Interface Options ................................................................ C-1
C.2 SDM-SIO1 Serial I/O Module Interface Option .............................. C-1
C.2.1 Program Example for SDM-SIO1 Module ............................... C-1
C.3 MD485 Multidrop Interface Option ................................................ C-4
C.3.1 MD485 Multidrop Interface Configuration .............................. C-6
C.3.2 CR1000 Example Program for use with MD485 ..................... C-7
Figures
Tables
4-1. HMP155A in shipping box .................................................................. 2
4-2. Cable routed through the connector cover ........................................... 3
4-3. Cable connected to the sensor ............................................................. 3
4-4. HMP155A with connector cover in place and without protective
cap .................................................................................................... 3
4-5. HMP155A and 14-plate radiation shield on a tripod mast .................. 4
4-6. HMP155A and 14-plate radiation shield on a CM200-series
crossarm ........................................................................................... 4
6-1. Probe dimensions ................................................................................ 9
6-2. Wiring of HMP155A 8-pin connector ................................................. 9
8-1. Changing the filter ............................................................................. 16
5-1. Recommended Lead Lengths .............................................................. 8
7-1. Connections for Single-Ended Measurements ................................... 12
7-2. Connections for Differential Measurements ...................................... 13
7-3. Power Connections using SW12V Power Switch ............................. 13
7-4. Parameters for Temperature .............................................................. 14
7-5. Parameters for Relative Humidity ..................................................... 14
8-1. Chemical Tolerances of HMP155A .................................................. 17
B-1. Wiring for Single-ended Measurement Examples ........................... B-1
B-2. Wiring for Differential Measurement Examples ............................. B-3
B-3. Wiring for Vapor Pressure Examples .............................................. B-5
ii
HMP155A Temperature and Relative
Humidity Probe
1. Introduction
The HMP155A probe monitors relative humidity (RH) for the range of 0 to
100% RH and temperature for the range of –80° to +60°C. It can provide
reliable measurements for a wide range of applications, as part of a weather
station system or as a single instrument. All Campbell Scientific dataloggers
are compatible.
Before using the HMP155A, please study
• Section 2, Cautionary Statements
• Section 3, Initial Inspection
• Section 4, Quickstart
More details are available in the remaining sections.
2. Cautionary Statements
• READ AND UNDERSTAND the Precautions section at the front of this
manual.
• Care should be taken when opening the shipping package to not damage or
cut the cable jacket. If damage to the cable is suspected, consult a
Campbell Scientific application engineer.
• Although the HMP155A is rugged, it should be handled as a precision
scientific instrument.
• Do not touch the sensor element.
• The black outer jacket of the cable is Santoprene® rubber. This
compound was chosen for its resistance to temperature extremes, moisture,
and UV degradation. However, this jacket will support combustion in air.
It is rated as slow burning when tested according to U.L. 94 H.B. and will
pass FMVSS302. Local fire codes may preclude its use inside buildings.
3. Initial Inspection
• Upon receipt of the HMP155A, inspect the packaging and contents for
damage. File damage claims with the shipping company.
• The model number and cable length are printed on a label at the
connection end of the cable. Check this information against the shipping
documents to ensure the correct product and cable length are received.
• Refer to the Ships With list to ensure that parts are included (see Section
3.1).
1
HMP155ATemperature and Relative Humidity Probe
Protective Cap
Connector Cover
3.1 Ships With
The HMP155A ships with:
(1) Adjustment Screwdriver from manufacturer
(1) Calibration Sheet
(1) Instruction Manual or ResourceDVD
4. Quickstart
Review Section 7, Installation, for siting, wiring, and CRBasic and Edlog
programming information.
4.1 Assembly and Mounting
Tools Required:
• 1/2 inch open end wrench
• small screw driver provided with datalogger
• UV resistant cable ties
• small pair of diagonal-cutting pliers
To install the HMP155A, you will need the 41005-5 14-Plate Radiation Shield.
The HMP155A is packaged with a white connector cover and a yellow sensor
head protective cap. See FIGURE 4-1.
FIGURE 4-1. HMP155A in shipping box
1. Slide the white connector cover off the sensor head before removing the
sensor from the box.
2
HMP155A Temperature and Relative Humidity Probe
Connector Cover
Cable Connector
2. Squeeze the sides of the white connector cover and insert the cable’s
connector through it (see FIGURE 4-2).
FIGURE 4-2. Cable routed through the connector cover
3. Attach the cable to the mating connector on the bottom of the HMP155A
(see FIGURE 4-3).
FIGURE 4-3. Cable connected to the sensor
4. Slide the white connector cover over the connector and gently push it up as
far as it will go. The white connector cover has built-in molded stops that
will only allow it to slide up so far. See FIGURE 4-4.
FIGURE 4-4. HMP155A with connector cover in place and without
protective cap
5. Loosen the split-nut on the bottom plate of the 41005-5 14-plate radiation
shield.
6. Remove the yellow protective cap on the HMP155A, and insert the sensor
into the shield.
7. Tighten the hex plug such that it compresses against the body of the
HMP155A to hold it inside the 41005-5 radiation shield.
8. If mounting the 41005-5 directly to a mast, place the 41005-5 U-bolt in the
side holes and secure the 41005-5 to the mast by tightening the U-bolt nuts
(FIGURE 4-5).
9. If using a CM200-series crossarm, mount the crossarm to the tripod or
tower. Then place the 41005-5’s U-bolt in the bottom holes and secure the
41005-5 to the crossarm by tightening the U-bolt nuts (see FIGURE 4-6).
10. Route the cable to the datalogger, and secure the cable to the mounting
structure using cable ties.
3
HMP155ATemperature and Relative Humidity Probe
CM200 Series Crossarm
14-Plate
Radiation Shield
Split Nut
U-bolt
Connector Cover
FIGURE 4-5. HMP155A and 14-plate radiation shield on a tripod mast
4
FIGURE 4-6. HMP155A and 14-plate radiation shield on a
CM200-series crossarm
HMP155A Temperature and Relative Humidity Probe
4.2 Use SCWin to Program Datalogger and Generate Wiring Diagram
Short Cut is an easy way to program your datalogger to measure the HMP155A
and assign datalogger wiring terminals. The following procedures shows using
Short Cut to program the HMP155A.
1. Install Short Cut by clicking on the install file icon. Get the install file
from either www.campbellsci.com, the ResourceDVD, or find it in
installations of LoggerNet, PC200W, PC400, or RTDAQ software.
2. The Short Cut installation should place a shortcut icon on the desktop
of your computer. To open Short Cut, click on this icon.
3. When Short Cut opens, select New Program.
5
HMP155ATemperature and Relative Humidity Probe
4. Select Datalogger Model and Scan Interval (default of 5 seconds is
OK for most applications). Click Next.
5. Under the Available Sensors and Devices list, select the Sensors |
Meteorological | Relative Humidity & Temperature | HMP155
folder. Select HMP155 (constant power) or HMP155 (panel
switched power) (shown). Click to move the selection to the
Selected device window. The temperature defaults to degrees
Celsius. This can be changed by clicking the Temperature box and
selecting one of the other options.
6
HMP155A Temperature and Relative Humidity Probe
6. After selecting the sensor, click at the left of the screen on Wiring
Diagram to see how the sensor is to be wired to the datalogger. The
wiring diagram can be printed out now or after more sensors are
added.
5. Overview
7. Select any other sensors you have, then finish the remaining Short Cut
steps to complete the program. The remaining steps are outlined in
Short Cut Help, which is accessed by clicking on Help | Contents |
Programming Steps.
8. If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC,
and the PC to datalogger connection is active, you can click Finish in
Short Cut and you will be prompted to send the program just created
to the datalogger.
9. If the sensor is connected to the datalogger, as shown in the wiring
diagram in step 6, check the output of the sensor in the datalogger
support software data display to make sure it is making reasonable
measurements.
The HMP155A Temperature and Relative Humidity probe contains a Platinum
Resistance Temperature detector (PRT) and a Vaisala HUMICAP
capacitive relative humidity sensor.
The HMP155A outputs a 0 to 1 Vdc signal for temperature and relative
humidity that can be measured by all models of Campbell Scientific
dataloggers with model HMP155ACBL1 cable. The HMP155A also has
RS-485 outputs for temperature and relative humidity that can be interfaced to
the CR800, CR850, CR1000, and CR3000 dataloggers using model
HMP155ACBL2 cable and the SDM-SIO1 Serial I/O Module (Appendix C,
Interfacing with HMP155A RS-485 Output). The RS-485 outputs has a higher
current drain than that listed in the specifications.
180
The HMP155A can be powered continuously or the power may be switched to
conserve battery life. The HMP155A consumes less than 3 milliamperes
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