Campbell Scientific HMP155A Temperature and Relative Humidity Probe - Manual (Page 8)

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
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
Tables
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
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