Campbell 109B Manuale utente

INSTRUCTION MANUAL

109B & 109BAM

Temperature Probe

April 2010

Campbell Scientific (Canada)Corp.

WARRANTY AND ASSISTANCE

This equipment is warranted by CAMPBELL SCIENTIFIC (CANADA) CORP. (“CSC”) 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

are not warranted. ***** CSC's obligation under this warranty is limited to repairing or

replacing (at CSC's option) defective products. The customer shall assume all costs of

removing, reinstalling, and shipping defective products to CSC. CSC will return such

products by surface carrier prepaid. This warranty shall not apply to any CSC 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. CSC is not

liable for special, indirect, incidental, or consequential damages.

Products may not be returned without prior authorization. To obtain a Return

Merchandise Authorization (RMA), contact CAMPBELL SCIENTIFIC (CANADA) CORP.,

at (780) 454-2505. An RMA number will be issued in order to facilitate Repair Personnel

in identifying an instrument upon arrival. Please write this number clearly on the outside

of the shipping container. Include description of symptoms and all pertinent details.

CAMPBELL SCIENTIFIC (CANADA) CORP. does not accept collect calls.

Non-warranty products returned for repair should be accompanied by a purchase order to

cover repair costs.

Model 109B & 109BAM Temperature Probe

Table of Contents

1. General ......................................................................... 1

1.1 Specifications............................................................................................1

2. Accuracy....................................................................... 2

3. Installation....................................................................3

3.1 Soil Temperature ......................................................................................3

3.2 Water Temperature...................................................................................4

4. Wiring............................................................................4

5. Programming ............................................................... 6

5.1 CRBasic....................................................................................................6

5.1.1 CRBasic Examples..........................................................................6

5.1.1.1 Sample Program for CR200(X) Series Datalogger ............7

5.1.1.2 Sample Program for CR1000 Datalogger...........................7

5.1.1.3 Sample Program for CR1000 Datalogger & AM16/32B

(4x16 mode)...................................................................................8

5.2 Edlog.........................................................................................................8

5.2.1 Example Edlog Programs................................................................9

5.2.1.1 Example Program for CR10X............................................9

5.3 Electrically Noisy Environments............................................................10

5.4 Long Lead Lengths.................................................................................10

6. Measurement Details................................................. 11

7. Maintenance and Calibration.................................... 12

8. Troubleshooting ........................................................ 12

Model 109B & 109BAM Temperature

Probe

1. General

The 109B Temperature Probe uses a thermistor to measure temperature. The

109B probe is designed for use with the CR200(X) series CR800 series,

CR1000, and CR3000 datalogger, which all have a special instruction, the

Therm109, for measuring it. The probe can be measured with other Campbell

Scientific dataloggers using generic measurement instructions.

The 109B Temperature Probe can measure soil/water temperatures. The probe

can be buried in soil (maximum of 86 psi) or submerged in water to 200 feet.

The 109BAM is typically used to measure soil or water temperature using a

Campbell Scientific datalogger and a multiplexer (i.e. AM16/32B). When

using the 109BAM with a multiplexer one pick off resistor is required for each

single ended channel used. This will vary depending on the multiplexer

configuration and the number of sensors measured.

The model name 109B will be used in this manual to refer to both 109B and

109BAM probes, unless otherwise specified. The -L option on the model

109B-L Temperature Probe indicates that the cable length is user specified.

This manual refers to the sensor as the 109B.

The standard cable length for the 109B is 25 feet. However, custom lead

length for the 109B-L can be specified when the sensor is ordered. Table 1-1

gives the recommended lead length for mounting the sensor on a tripod or

tower.

TABLE 1-1. 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: Add two feet to the cable length if you are mounting the enclosure on the leg base of a light-weight tripod.

The 109B ships with:

(1) Resource CD

Model 109B & 109 BAM Temperature Probe

1.1 Specifications

Sensor: US Sensor Corp. PR103J23 Thermistor

Temperature

Measurement Range: -50°to +70°C

Thermistor Inter-

changeability Error: Typically <±0.2°C over 0°C to 70°C; ±0.5 @ -50°C

Temperature

Survival Range: -50°C to +100°C

Linearization Error: The Steinhart and Hart equation used to calculate

temperature is fit to the range of 0 to 70°C; maximum

error is 0.03°C at -50°C.

Time Constant

In Air: Between 30 and 60 seconds in a wind speed of 5 m s-1

Maximum Lead Length: 1000 ft.

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.

NOTE

2. Accuracy

The overall probe accuracy is a combination of the thermistor's interchangeability

specification and the accuracy of the bridge resistor. The Steinhart and Hart

equation used to calculate temperature has a negligible error (Figure 2-1). In a

"worst case" the errors add to an accuracy of ±0.6°C over the range of -50°to 70°C

and ±0.25°C over the range of -10°C to 70°C. The major error component is the

interchangeability specification of the thermistor. The bridge resistor has a 0.1%

tolerance with a 10 ppm temperature coefficient. Figure 2-2 shows the possible

worst case probe and measurement errors. Note that at temperature extremes the

possible error in the CR200(X) measurement may be greater than the error that

may exist in the probe.

Model 109B & 109 BAM Temperature Probe

Steinhart & Hart - Tabulated values

-0.005

0.005

0.01

0.015

0.02

0.025

0.03

-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70

Temperature Degrees C

Error Degrees C

FIGURE 2-1. Steinhart and Hart

Worst Case Errors in 109 Temperature Measurement

0.1

0.2

0.3

0.4

0.5

0.6

0.7

-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70

Temperature Degrees C

Possible Error Degrees C

Thermistor Tolerance

CR200 Bridge Measurement Error (0.06% of reading+2.4 mV)

CR10X Bridge Measurement Error, CR200 Resolution (0.5 mV, 0.6 mV)

24.9 k Ohm Fixed Resistor Tolerance (0.1% + 10ppm/degC away from 25deg)

FIGURE 2-2. Possible Errors

3. Installation

3.1 Soil Temperature

The 109B is suitable for burial. Whenever possible it should be placed

horizontally at the desired depth to avoid thermal conduction from the surface

to the thermistor. The recommended maximum burial depth is equivalent to 86

psi.

Model 109B & 109 BAM Temperature Probe

Placement of the cable inside a rugged conduit may be advisable for long cable

runs, especially in locations subject to digging, mowing, traffic, use of power

tools, or lightning strikes.

3.2 Water Temperature

The 109B can be submerged to 200 feet. Please note that the 109B is not

weighted. Therefore, the installer should either add a weighting system or

secure the probe to a fixed or submerged object.

4. Wiring

Connections to Campbell Scientific dataloggers are given in Table 4-1. The

109B Temperature is measured with one Single-Ended input channel and a

Voltage Excitation channel. Multiple probes can be connected to the same

excitation channel (the number of probes per excitation channel is physically

limited by the number of lead wires that can be inserted into a single voltage

excitation terminal, approximately six).

TABLE 4-1. 109B Connections to Campbell Scientific Dataloggers

Colour Heat Shrink

Label

CR200(X)

CR800

CR3000

CR1000

CR510

CR500

CR10(X)

CR5000

CR23X

Black Volt Excite

Switched

Voltage

Excitation

(Vx)

Switched

Voltage

Excitation

Switched

Voltage

Excitation

(Vx)

Red Signal

Single-Ended

Input

Single-Ended

Input

Single-Ended

Input

Purple Signal

Reference AG

Clear Shield G

The 109BAM is measured directly by the multiplexer (i.e. AM16/32B) with

the use of the H & L input channels. A 24.9KΩresistor assembly (RES24.9K-

0.1) is required at the datalogger to complete the half bridge measurement at

each of the single ended channels used. Additional information regarding

multiplexer connections can be found in the multiplexer manual.

Table 4-2 shows the wiring for up to three 109BAMs for each of the COM

terminals.

Model 109B & 109 BAM Temperature Probe

TABLE 4-2. 109BAM, MUX & Datalogger Connections

Function Colour

Multiplexer

Connection

CR200(X)

CR800

CR1000

CR3000

CR510

CR500

CR10(X)

CR5000

CR23X

109BAM (1,2,3)

Excitation* Black 1H terminal

109BAM(1) Signal* White 1L terminal

109BAM(2) Signal* White 2H terminal

109BAM(3) Signal* White 2L terminal

109BAM(1,2,3) Clear* Shield

Mux Power** Red 12V 12V 12V 12V

Power Reference** Black GND G G G

Mux Clock** Green CLK C(1) C(1) C(1)

Mux Reset** White RES C(2) C(2) C(2)

Shield** Clear G

Excitation Source† Red COM ODD H Vx(1) E(1) Vx(1)

Signal Return(1)† White COM ODD L SE(1)†† SE(1) †† SE(1) ††

Signal Return(2)† Black COM EVEN H SE(2) †† SE(2) †† SE(2) ††

Signal Return(3)† Green COM EVEN L SE(3) †† SE(3) †† SE(3) ††

Shield† Clear COM G

* The wiring assumes that the datalogger in the “4x16”

configuration.

**Connections are made with the FIN4COND(-L) on the

Multiplexer at the “Control” Terminals and connect the

corresponding terminals on the datalogger.

† Connections are made with a second FIN4COND(-L) on the

multiplexer at the “COM” terminals and connect the

corresponding terminals on the datalogger.

†† Each single ended channel used requires a RES24.9K-0.1

completion resistor assembly. The RES24.9K-0.1 must be

connected between the single ended channel and Ground

(i.e. or G).

NOTES

Model 109B & 109 BAM Temperature Probe

5. Programming

This section is for users who write their

own datalogger programs. A datalogger program to measure this

sensor can be generated using Campbell Scientific’s Short Cut

Program Builder software. You do not need to read this section

to use Short Cut.

NOTE

The datalogger is programmed using either CRBasic or Edlog. Dataloggers

that use CRBasic include our CR200(X)-series, CR800, CR850, CR1000,

CR3000, CR5000, and CR9000(X); see Section 5.1. Dataloggers that use

Edlog include our CR510, CR10(X), CR23X, and CR7; refer to Section 5.2.

Short Cut, CRBasic, and Edlog are included in our LoggerNet, PC400, and

RTDAQ software.

If applicable, please read “Section 5.3—Electrically Noisy Environments” and

“Section 5.4—Long Lead Lengths” prior to programming your datalogger.

Measurement details are provided in Section 6.

5.1 CRBasic

In the CR200(X)-series, CR800, CR850, CR1000, and CR3000 dataloggers,

Instruction Therm109 is used to measure temperature. Therm109 provides

excitation, makes a single ended voltage measurement, and calculates

temperature.

The Therm109 instruction has the following form:

Therm109 (Dest, Repetitions, SE Chan, Ex Chan, Multiplier, Offset)

A multiplier of 1.0 and an offset of 0.0 yields temperature in Celsius. For

Fahrenheit, use a multiplier of 1.8 and an offset of 32. See Section 5.1.1 for

example programs.

The CR5000 and CR9000(X) use the BrHalf instruction to read the 109B’s

resistance. The Steinhart-Hart equation is entered as an expression to convert

the resistance to degrees Celsius.

5.1.1 CRBasic Examples

TABLE 5-1. Wiring for Examples 5.1.1.1 & 5.1.1.2

Colour Function Connection

Black Excitation EX1 or VX1

Red Signal SE1

Purple Signal Ground

Clear Shield

Model 109B & 109 BAM Temperature Probe

5.1.1.1 Sample Program for CR200(X) Series Datalogger

'CR200(X) Series Datalogger

‘This example program measures a single 109B Thermistor probe

‘once a second and stores the average temperature every 10 minutes.

‘Declare the variable for the temperature measurement

Public Air_Temp

‘Define a data table for 10 minute averages:

DataTable (AvgTemp,1,1000)

DataInterval (0,10,min)

Average (1,Air_Temp,0)

EndTable

BeginProg

Scan (1 ,sec)

‘Measure the temperature:

Therm109 (Air_Temp,1,1,Ex1,1.0,0)

Call the data table:

CallTable AvgTemp

NextScan

EndProg

5.1.1.2 Sample Program for CR1000 Datalogger

'CR1000

'Declare Variables and Units

Public T109B_C

Units T109B_C=Deg C

'Define Data Tables

DataTable(Table1,True,-1)

DataInterval(0,10,Min,10)

Average(1,T109B_C,FP2,False)

EndTable

'Main Program

BeginProg

Scan(1,Sec,1,0)

'109B Temperature Probe measurement T109B_C:

Therm109(T109B_C,1,1,1,0,_60Hz,1.0,0.0)

'Call Data Tables and Store Data

CallTable(Table1)

NextScan

EndProg

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