Campbell Scientific SS100 User Manual

SS100 Sensor Simulator

12/10

Copyright © 2007-2010

Campbell Scientific, Inc.

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The SS100 SENSOR SIMULATOR is warranted by Campbell Scientific, Inc.
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SS100 Table of Contents

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

2. Specifications ..............................................................1

3. Wind Speed and Direction Simulation ....................... 1

4. Tipping Bucket Rain Gage Simulation.......................3

5. Water Level Pressure Transducer Simulation ..........3

i

SS100 Sensor Simulator

1. General

The SS100 is a device used when the Campbell Scientific CR1000/LoggerNet
Training Course is taught out-of-house. The SS100 is powered by a nominal
12VDC power source, typically the datalogger itself, and provides several
outputs typical of those from sensors commonly measured by Campbell
Scientific dataloggers.

The Training Course instructors may use the SS100 in a variety of simulations
of their own choosing or use the analogies in this manual.

2. Specifications

Supply Voltage
12VDC

Analog Outputs
0-2.2 VDC

Pulse Outputs
High Frequency Pulse: 0-5 VDC, 3-140 Hz, non-linear
Low Level AC: 1 VDC, 3-140 Hz, non-linear

Bridge Measurement
Full bridge circuit
Fixed resistors 5 Kohm
Variable resistor 10 Kohm

Switch Closure
Momentary push button switch, normally open
Approximate duration: 135 ms

3. Wind Speed and Direction Simulation

Sensor: Wind Speed and Direction

Wind Direction (Use SS100 Analog Output)
Range: 0-360°
Accuracy: +/- 3%
Resolution: 1°
Wind Direction Voltage: 0-2200 mVDC

Wiring

SS100 CR1000

+ SE1
G

Multiplier and offset calculation:
Multiplier = 360 degrees / 2200 mV
Offset = 0

1

SS100 Sensor Simulator

CRBasic Measurement Instruction:
VoltSe (WindDir,1,mv2500C,1,1,0,_60Hz,360/2200,0)

Wind Speed (Use SS100 High Frequency Pulse Output)
Range: 0-50 m/s
Accuracy: +/- 5% > 5 m/s or 0.2 m/s < 5 m/s
Resolution: 0.1 m/s
Wind Speed Output: Linear, Calm = 3Hz, 50 m/s = 140 Hz

Wiring

SS100 CR1000

P P1
G

Multiplier and offset calculation:
Using the equation of a line with two known points (0,3) and (50,140):
y=mx + b; m = (50-0) / (140-3) = 0.365 m/s / Hz
b=y-mx; 50 - .365(140) = -1.095 m/s

CRBasic measurement instruction:
PulseCount (WS_ms,1,1 ,0,1,.365,-1.095) 'configured for high frequency

CR1000 Wind Speed and Wind Direction Example

'CR1000 Series Datalogger

'Declare Public Variables
Public WS_ms, WindDir

'Define Data Tables

DataTable (SS100,true,-1)
DataInterval (0,60,Sec,10)
WindVector (1,WS_ms,WindDir,FP2,False,0,0,0)
FieldNames ("WS_ms,WindDir,WindDir_SD1")
EndTable

'Main Program

BeginProg
Scan (1,Sec,0,0)

'Analog Output - Simulated Wind Direction

VoltSe (WindDir,1,mv2500C,1,1,0,_60Hz,360/2200,0)

'Pulse Output - Simulated Wind Speed
PulseCount (WS_ms,1,1 ,0,1,.365,-1.095) 'high frequency Hz

'Call Output Tables

CallTable SS100

NextScan
EndProg

2

4. Tipping Bucket Rain Gage Simulation

Sensor: Tipping Bucket Rain Gage

Signal Output: Momentary switch closure activated by tipping bucket

mechanism.

Rainfall per tip: 0.01 in.

Wiring

SS100 CR1000

P P2
G

CR1000 Tipping Bucket Rain Gage Simulation Example

'CR1000
'Declare Variables and Units

Public rain_fall

Units rain_fall=inch

'Define Data Tables

DataTable (rain_fall,True,-1)
DataInterval (0,1,Min,0)
Totalize (1,rain_fall,FP2,0)
EndTable

'Main Program

BeginProg
Scan (1,Sec,1,0)

'Tipping bucket 0.01" per tip.

PulseCount (rain_fall,1,2,2,0,0.01,0)
CallTable (rain_fall)
NextScan
EndProg

SS100 Sensor Simulator

5. Water Level Pressure Transducer Simulation

Sensor: Submersible pressure transducer

Input: Precise excitation voltage 2.5 VDC

Output: Full bridge differential voltage, linear output, maximum negative

voltage equivalent to zero pressure, maximum positive output equivalent
to maximum pressure. Must calibrate in field to determine offset and
maximum and minimum pressures.

3

SS100 Sensor Simulator

CR1000 Water Level Pressure Transducer Simulation Example

'CR1000 Series Datalogger

'Declare Public Variables

Public depth_ft

'Define Data Tables

DataTable (SS100,true,-1)
DataInterval (0,60,Sec,10)
Minimum (1,depth_ft,FP2,0,False)
EndTable

'Main Program

BeginProg
Scan (1,Sec,0,0)

'Bridge Measurement - Simulated Water Level

BrFull (depth_ft,1,mv2500C,2,Vx1,1,2500,True ,True ,0,_60Hz,0.15,26.14)

'Call Output Tables

CallTable SS100

NextScan
EndProg

Wiring

SS100 CR1000

Vin EX1
V1out 2H
V2out 2L
G

Multiplier and offset calculation:
Results with mult = 1, offset = 0, minimum depth = -177, maximum =

500. Assuming the range of the sensor is 0-100 feet, calculate the
multiplier and offset using equation of line; m = 0.15, offset = 26.14.

CRBasic measurement instruction:
BrFull (depth_ft,1,mv2500C,2,Vx1,1,2500,True ,True ,0,_60Hz,0.15,26.14)

4

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