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Warranty and Assistance 

The

 

HMP50 TEMPERATURE AND RELATIVE HUMIDITY PROBE 

is 

warranted by CAMPBELL SCIENTIFIC, INC. to be free from defects in 
materials and workmanship under normal use and service for twelve (12) 
months from date of shipment unless specified otherwise.  Batteries have no 
warranty.  CAMPBELL SCIENTIFIC, INC.'s obligation under this warranty is 
limited to repairing or replacing (at CAMPBELL SCIENTIFIC, INC.'s option) 
defective products.  The customer shall assume all costs of removing, 
reinstalling, and shipping defective products to CAMPBELL SCIENTIFIC, 
INC.  CAMPBELL SCIENTIFIC, INC. will return such products by surface 
carrier prepaid.  This warranty shall not apply to any CAMPBELL 
SCIENTIFIC, INC. products which have been subjected to modification, 
misuse, neglect, accidents of nature, or shipping damage.  This warranty is in 
lieu of all other warranties, expressed or implied, including warranties of 
merchantability or fitness for a particular purpose.  CAMPBELL SCIENTIFIC, 
INC. is not liable for special, indirect, incidental, or consequential damages. 

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) 753-2342.  After an applications 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 “Declaration of Hazardous Material 
and Decontamination” form and comply with the requirements specified in it.  
The form is available from our website at 

www.campbellsci.com/repair

.  A 

completed form must be either emailed to 

repair@campbellsci.com

 or faxed to 

435-750-9579.  Campbell Scientific will not 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. 

Summary of Contents for HMP50

Page 1: ...HMP50 Temperature and Relative Humidity Probe Revision 10 09 C o p y r i g h t 1 9 9 5 2 0 0 9 C a m p b e l l S c i e n t i f i c I n c...

Page 2: ...ternational 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 det...

Page 3: ...ograms 6 5 1 Example for CR1000 7 5 2 Example for CR10X 8 6 Long Lead Lengths 9 7 Absolute Humidity 9 7 1 CR1000 Vapor Pressure Example 10 7 2 Sample CR10 X Program that Computes Vapor Pressure and Sa...

Page 4: ...nts ii Tables 1 Recommended Lead Lengths 1 2 Datalogger Connections 6 3 Calibration for Temperature 7 4 Calibration for Relative Humidity 7 5 Wiring for CR1000 and CR10X Examples 7 6 Wiring for Vapor...

Page 5: ...P50 TABLE 1 Recommended Lead Lengths 2 m Height Atop a tripod or tower via a 2 ft crossarm such as the CM202 Mast Leg CM202 CM6 CM10 CM110 CM115 CM120 UT10 UT20 UT30 9 11 11 14 14 19 24 14 24 37 Note...

Page 6: ...sor Sensor INTERCAP Relative Humidity Measurement Range 0 to 98 non condensing RH Output Signal Range 0 to 1 0 VDC Accuracy at 20 C 3 RH 0 to 90 Relative Humidity 5 RH 90 to 98 Relative Humidity Tempe...

Page 7: ...erature and relative humidity sensors 3 2 Mounting and Assembly Pull off the yellow shipping cap see Figure 1 The HMP50 must be housed inside a solar radiation shield when used in the field The 41303...

Page 8: ...HMP50 Temperature and Relative Humidity Probe Yellow Shipping Cap remove before installation FIGURE 1 HMP50 as Shipped FIGURE 2 HMP50 and 41303 5A Radiation Shield on a Tripod Mast 4...

Page 9: ...HMP50 Temperature and Relative Humidity Probe FIGURE 3 HMP50 and 41303 5A Radiation Shield on a CM202 Crossarm FIGURE 4 HMP50 and 41303 5A Radiation Shield Mounting Clamp 5...

Page 10: ...lue G G Power 12V Brown 12 V 12 V 12 V Shield Clear G 4 Wiring Connections to Campbell Scientific dataloggers are given in Table 2 The probe is measured by two single ended analog input channels one f...

Page 11: ...ABLE 3 Calibration for Temperature Units Multiplier degrees mV 1 Offset degrees Celsius 0 1 40 Fahrenheit 0 18 40 TABLE 4 Calibration for Relative Humidity Units Multiplier mV 1 Offset Percent 0 1 0 F...

Page 12: ...00 mV CR23X 1000 mV 21X CR7 5000 mV 3 3 SE Channel Black wire SE 3 Blue wire G 4 1 Loc T_C 5 1 Mult See Table 3 for alternate multipliers 6 40 Offset See Table 3 for alternate offsets Measure the HMP5...

Page 13: ...when it is powered The wire used in the HMP50 P N 18159 has resistance of 26 2 1000 feet Using Ohm s law the voltage drop Vd along the signal reference power ground lead is given by Eq 1 ft 1000 mV 2...

Page 14: ...elationship between relative humidity and air temperature finding the mean relative humidity is meaningless A more useful quantity is the mean vapor pressure The mean vapor pressure can be computed on...

Page 15: ...allTable Table1 NextScan EndProg 7 2 Sample CR10 X Program that Computes Vapor Pressure and Saturation Vapor Pressure Measure the HMP50 temperature 01 Volt SE P1 1 1 Reps 2 5 2500 mV Slow Range CR510...

Page 16: ...inimal maintenance Check monthly to make sure the radiation shield is free from debris The white screen at the tip of the probe should also be checked for contaminants When installed in close proximit...

Page 17: ...it To prevent scratching avoid touching the silver RH chip and handle the RH chip with care CAUTION 3 Rinse the RH chip or dispose of the old RH chip 4 Hold the sides of the rinsed or new chip and pl...

Page 18: ...HMP50 Temperature and Relative Humidity Probe 14...

Page 19: ......

Page 20: ...a Corp CSC 11564 149th Street NW Edmonton Alberta T5M 1W7 CANADA www campbellsci ca dataloggers campbellsci ca Campbell Scientific Centro Caribe S A CSCC 300 N Cementerio Edificio Breller Santo Doming...

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