255-100 Novalynx Analog Output Evaporation Gauge 1/09 C o p y r i g h t © 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 .
Warranty and Assistance The 255-100 NOVALYNX ANALOG OUTPUT EVAPORATION GAUGE 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.
255-100 Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. 1. General .........................................................................1 2. Specifications ..............................................................2 3. Installation....................................................................4 4. Wiring......................................................................
255-100 Novalynx Analog Output Evaporation Gauge 1. General Novalynx Corporation manufacturers the 255-100 Analog Output Evaporation Gauge and the 255-200 Class A Evaporation Pan. The 255-100 consists of a stilling well and potentiometer based shaft encoder. It is a low-power option for reading the water level of an evaporation pan such as the 255-200. The 255-100 consists of a chain-mounted float and counter weight that turns a sprocket attached to a precision 1000 ohm potentiometer.
255-100 Novalynx Analog Output Evaporation Gauge 2. Specifications FIGURE 1. 255-100 Connected to 255-200 Using 255-100P/F 255-100 Novalynx Analog Output Evaporation Gauge Height: 27 1/2” (700 mm) Diameter: 8” (203 mm) Weight: 7 1/2 lbs (3.4 kg) Shipping weight: 15 lbs (6.8 kg) Cable: 50' of 3-conductor, 24 AWG, shielded Float: 4” diameter, plastic Counterweight: 4 oz (114 g), stainless steel Water input port: 1/2” NPT coupling, female Base dimensions: 16” (40.
255-100 Novalynx Analog Output Evaporation Gauge 255-200 Novalynx Class A Evaporation Pan Material: Low carbon stainless steel, type 304, 18 gauge Construction: Heliarc welded, 1/2” drain plug NPT female coupling Size: 10” deep x 47-1/2” diameter (25.4 cm x 120.7 cm) Volume: Approximately 77 gallons (291 liters) Weight: 48 lbs (21.8 kg) Shipping weight: 59 lbs (26.8 kg) FIGURE 3.
255-100 Novalynx Analog Output Evaporation Gauge NovaLynx Model 255-250 Evaporation Pan Support Platform (Available by Special Order) Wood platform for supporting the evaporation pan Weight: 30 lb (13.6 kg) Dimensions: 50” x 50” x 10” (127 cm x 127 cm x 25.4 cm) NOTE This can easily be built by using the NovaLynx sketch, or a wood pallet of these dimensions might be available locally. 3. Installation Please refer to the NovaLynx instruction manual Section 3. 4.
255-100 Novalynx Analog Output Evaporation Gauge 5. Programming Depending on the model of datalogger, make the measurement using the Excite-Delay SE (P4) Edlog instruction, ExDelSE CR200 Series instruction, or the BrHalf CRBasic instruction. An example from each language follows. Multiplier and offset will depend on the calibration of the gauge. These examples are for those who wish write their own program.
255-100 Novalynx Analog Output Evaporation Gauge DataTable (Hourly,1,-1) DataInterval (0,60,min,10) Sample (1,PanLevel,FP2) Minimum (1,batt_volt,FP2,0,False) Sample (1,PTemp,FP2) EndTable BeginProg Scan (60,Sec,0,0) PanelTemp (PTemp,250) Battery (Batt_volt) 'Make five measurements then average the readings to reduce error from ripples in the water BrHalf (Leveltemp(),5,mV2500,-1,Vx1,5,2500,True ,20000,_60Hz,PanMultiplier,PanOffset) AvgSpa (PanLevel,5,Leveltemp(1)) 'Call data tables CallTable Hourly NextSca
255-100 Novalynx Analog Output Evaporation Gauge 02: Beginning of Loop (P87) 1: 0 Delay 2: 5 Loop Count 03: Excite-Delay, SE (P4) 1: 1 Reps 2: 5 ±2500 mV Slow Range 3: 1 SE Channel 4: 1 Excite all reps w/Exchan 1 5: 1 Delay (units 0.01 sec) 6: 2500 mV Excitation 7: 21 -- Loc [ Level_1 ] **8:1.0 Mult **9:0.0 Offset ;It is important the Location is indexed (--). 04: Excitation with Delay (P22) 1: 1 Ex Channel 2: 0 Delay W/Ex (units = 0.01 sec) 3: 10 Delay After Ex (units = 0.
255-100 Novalynx Analog Output Evaporation Gauge (3) Add more water to the evaporation pan and measure the water’s depth in the pan. (4) Measure the voltage at that depth using the gauge and datalogger Instruction 4, ExDelSE or BrHalf with a multiplier of 1.0 and an offset of 0.0. (5) Calculate the multiplier and offset using the method described in Section 5 of the NovaLynx instruction manual. Example This example calculates the multiplier (m) and offset (b) for a specific evaporation gauge.
255-100 Novalynx Analog Output Evaporation Gauge between 8 1/2” and 9 1/2” (depending on water pressure). The Electronic Water Timer will enable tank filling at a user set time and interval. If more precise fill control is wanted, program the datalogger to control a solenoid valve in a fill line that’s connected to a water supply. A second solenoid may be used for draining the pan in areas of high rainfall. Power requirements need to be taken into consideration when using a solenoid valve. 8.
255-100 Novalynx Analog Output Evaporation Gauge Assuming you refill the pan once a day and the evaporation rate is 10 mm (1 cm) per day, the amount of water you’ll use is: (1 cm/day)(11,674.56 cm²) = 11,674.56 cm³/day or 11.675 liters/day or 3.1 gallons/day If you use a 125 gallon tank, you will need to refill the tank in approximately: (125 gallons)/(3.1 gallons/day) » 40 days 10.
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