CMT MANUAL 6. NMC SENSORS

CMT MANUAL 6. NMC SENSORS

TABLE OF CONTENTS INDEMNITY... 5 DOCUMENT INFORMATION... 5 ACKNOWLEDGEMENTS... 5 6.1 INTRODUCTION... 6 6.2 TEMPERATURE AND HUMIDITY SENSORS... 7 6.2.1. TEMPERATURE SENSOR... 7 6.2.1.1 TEMPERATURE SENSOR SPECIFICATIONS... 8 6.2.1.2 TEMPERATURE SENSOR CONNECTIONS... 8 6.2.2 HUMIDITY SENSOR... 9 6.2.2.1 HUMIDITY SENSOR SPECIFICATIONS... 9 6.2.2.2 HUMIDITY SENSOR CONNECTIONS... 9 6.2.2.3 HUMIDITY SENSOR CLEANING AND MAINTENANCE... 10 6.2.3 INSIDE TEMPERATURE AND HUMIDITY BOX INSTALLATION... 11 6.4 WIND SPEED AND DIRECTION SENSOR... 13 6.4.1 WIND SPEED AND DIRECTION SENSOR SPECIFICATIONS... 13 6.4.1 WIND SPEED AND DIRECTION SENSOR CONNECTIONS... 14 6.4.2 WIND SPEED AND DIRECTION SENSOR INSTALLATION AND ORIENTATION... 14 6.4.2 WIND SPEED AND DIRECTION SENSOR MAINTENANCE... 16 6.5 RAIN SENSORS... 17 6.5.1 RAIN DETECTOR SENSOR... 17 6.5.1.1 RAIN DETECTOR SENSOR SPECIFICATIONS... 17 6.5.1.2 RAIN DETECTOR SENSOR CONNECTIONS... 17 6.5.1.3 RAIN DETECTOR SENSOR MOUNTING... 17 6.5.1.4 RAIN DETECTOR SENSOR INSTALLATION AND MAINTENANCE... 18 6.5.2 RAIN COLLECTOR SENSOR... 19 6.5.2.1 RAIN COLLECTOR SENSOR SPECIFICATIONS... 19 6.5.2.2 RAIN COLLECTOR SENSOR CONNECTIONS... 20 6.6 RADIATION SENSORS... 21 6.6.1 RADIATION SENSOR DAVIS... 21 6.6.1.1 RADIATION SENSOR DAVIS - SPECIFICATIONS... 22 6.6.1.2 RADIATION SENSOR DAVIS - CONNECTIONS... 22 Version 2.01 JA20120119 NMC Sensors Page 1

6.6.2 RADIATION SENSOR NETAFIM... 23 6.6.2.1 RADIATION SENSOR NETAFIM - SPECIFICATIONS... 23 6.6.2.2 RADIATION SENSOR NETAFIM - CONNECTIONS... 24 6.6.2.3 RADIATION SENSOR NETAFIM MAINTENANCE... 24 6.7 CO 2 SENSOR... 25 6.7.1 CO2 SENSOR SPECIFICATIONS... 25 6.7.2 CO2 SENSOR MAINTENANCE... 25 6.8 WEATHER SENSOR MOUNTING ARM INSTALLATION... 26 Version 2.01 JA20120119 NMC Sensors Page 2

LIST OF TABLES TABLE 1. TEMPERATURE SENSOR SPECIFICATIONS... 8 TABLE 2 TEMPERATURE SENSOR CONNECTIONS... 8 TABLE 3. HUMIDITY SENSOR SPECIFICATIONS... 9 TABLE 4. HUMIDITY SENSOR CONNECTIONS... 9 TABLE 5. WIND SPEED AND DIRECTION SENSOR SPECIFICATIONS... 13 TABLE 6. WIND SPEED AND DIRECTION SENSOR CONNECTIONS... 14 TABLE 7. RAIN DETECTOR SENSOR SPECIFICATIONS... 17 TABLE 8. RAIN DETECTOR SENSOR CONNECTIONS... 17 TABLE 9. RAIN COLLECTOR SENSOR SPECIFICATIONS... 19 TABLE 10. RAIN COLLECTOR SENSOR CONNECTIONS... 20 TABLE 11. RADIATION SENSOR DAVIS - SPECIFICATIONS... 22 TABLE 12. RADIATION SENSOR DAVIS - CONNECTIONS... 22 TABLE 13. RADIATION SENSOR NETAFIM - SPECIFICATIONS... 23 TABLE 14. RADIATION SENSOR NETAFIM - CONNECTIONS... 24 TABLE 15. CO2 SENSOR SPECIFICATIONS... 25 LIST OF FIGURES FIGURE 1. TEMPERATURE SENSOR... 7 FIGURE 2. INSIDE CLIMATE BOX... 7 FIGURE 3. OUTSIDE SHIELD COVER... 7 FIGURE 4. HUMIDITY SENSOR... 9 FIGURE 5. HUMIDITY SENSOR TIP WITH PROTECTIVE COVERS REMOVED... 10 FIGURE 6. HUMIDITY SENSOR TIP REPLACEMENT... 10 FIGURE 7. TEMPERATURE AND HUMIDITY BOX MOUNTED IN A GREENHOUSE... 12 FIGURE 8. WIND SPEED AND DIRECTION SENSOR... 13 FIGURE 9. WIND SENSOR COMPONENTS... 14 FIGURE 10. REMOVE WIND VANE... 14 FIGURE 11. ZERO THE WIND DIRECTION SHAFT... 15 FIGURE 12. WIND SENSOR NOSE AND ARM IN SAME DIRECTION... 15 FIGURE 13. PUSH THE WIND VANE DOWN ONTO THE SHAFT... 15 FIGURE 14. FIX THE WIND VANE TO THE SHAFT... 16 Version 2.01 JA20120119 NMC Sensors Page 3

FIGURE 15. ORIENT THE WIND SENSOR ARM... 16 FIGURE 16. RAIN DETECTOR SENSOR MOUNTING... 18 FIGURE 17. RAIN COLLECTOR SENSOR... 19 FIGURE 18. RADIATION SENSOR DAVIS... 21 FIGURE 19. RADIATION SENSOR NETAFIM... 23 FIGURE 20. CO 2 SENSOR... 25 FIGURE 21. WEATHER SENSOR MOUNTING ARM AND SENSORS... 26 Version 2.01 JA20120119 NMC Sensors Page 4

INDEMNITY Netafim South Africa (Pty) Ltd has taken all reasonable care in ensuring the integrity and reliability of the information contained in this document. Despite this Netafim South Africa (Pty) Ltd. takes no responsibility for any damage or loss that may result from the use of this manual. This document should be regarded as the property of Netafim South Africa (Pty) Ltd. This document is not intended for further training and neither may it be reproduced nor copied in its current form or temporary form. This document may not be revealed and/or carried over to any third party without the explicit written consent of Netafim South Africa (Pty) Ltd. This document is presented with the exclusive aim of notifying selected potential clients regarding NMC Sensors. Receipt or the possession of this document does not imply rights and the contents should be viewed as a proposal only. This document is neither issued as a guarantee, nor does it confirm any legal obligations on Netafim South Africa (Pty) Ltd whatsoever. Netafim South Africa (Pty) Ltd reserves the right to make changes in its products and in the NMC Sensors without prior notice. DOCUMENT INFORMATION Version: 2.01 Last updated: 19 January 2012 ACKNOWLEDGEMENTS Netafim South Africa Version 2.01 JA20120119 NMC Sensors Page 5

6.1 INTRODUCTION The NMC Climate Sensors available can be used on the following controller models: NMC Junior, NMC 64 Climate, NMC Pro and NMC DC. Not all of the sensors can be connected to all of the controller models. These connections are explained in Section 2 Installation - Hardware of the CMT Manual. Further, refer to 1.4 CMT Specifications and Limitations for the quantity of various sensors that can be configured to each controller. NMC Climate Sensors available include: Inside and/or Outside Temperature Inside and/or Outside Humidity Rain Sensor ON/OFF to indicate rain status Rain Collector to measure rain quantity Wind Speed and Direction Radiation sensor (DAVIS) to measure radiation level Radiation sensor (NETAFIM) to measure radiation level and sum. CO2 sensor The temperature and humidity sensors can be installed in a climate box or in shield covers. The climate box will be installed inside a greenhouse to measure climate compartment conditions and include a fan to circulate greenhouse air over the sensors.. The shield cover will be used with the weather station to measure outside climatic conditions. All weather station sensors can be mounted on a mounting arm bracket. This bracket will ensure the correct installation of sensors and simplify the installation. Version 2.01 JA20120119 NMC Sensors Page 6

6.2 TEMPERATURE AND HUMIDITY SENSORS 6.2.1. TEMPERATURE SENSOR FIGURE 1. TEMPERATURE SENSOR FIGURE 2. INSIDE CLIMATE BOX FIGURE 3. OUTSIDE SHIELD COVER Version 2.01 JA20120119 NMC Sensors Page 7

6.2.1.1 TEMPERATURE SENSOR SPECIFICATIONS TABLE 1. TEMPERATURE SENSOR SPECIFICATIONS Details Units Input voltage 1 to 40 VDC Output current 1 μa for 1 kelvin Operating temperature -25 to 100⁰C Maximum error with no calibration ±3% 6.2.1.2 TEMPERATURE SENSOR CONNECTIONS TABLE 2 TEMPERATURE SENSOR CONNECTIONS Wire colour Red Black Shield Description Output 3 kω Common Earth Version 2.01 JA20120119 NMC Sensors Page 8

6.2.2 HUMIDITY SENSOR FIGURE 4. HUMIDITY SENSOR See Figure 2 for the Inside climate box and Figure 3 for the Outside shield cover, in either of which the sensor may be fitted. 6.2.2.1 HUMIDITY SENSOR SPECIFICATIONS TABLE 3. HUMIDITY SENSOR SPECIFICATIONS Details Units Input voltage Output voltage Operating temperature 8 to 14 VDC 0 to 3 VDC -10 to 70⁰C RH range 0 to 100% Accuracy: RH 10 to 90% RH 90 to 100% ±2.0% ±3.5% 6.2.2.2 HUMIDITY SENSOR CONNECTIONS TABLE 4. HUMIDITY SENSOR CONNECTIONS Wire colour Red Black White Shield Description 12 VDC Common 0 to 3 VDC output Earth Version 2.01 JA20120119 NMC Sensors Page 9

6.2.2.3 HUMIDITY SENSOR CLEANING AND MAINTENANCE Open the humidity sensor by unscrewing the sensor filter cover and remove the filter before cleaning. Clean the filter every 6 months or as required. Use water only. Avoid touching the sensor during the cleaning process. NB Warning. Water may damage the sensor. Make sure that the sensor is sealed whilst washing or in contact with water. FIGURE 5. HUMIDITY SENSOR TIP WITH PROTECTIVE COVERS REMOVED FIGURE 6. HUMIDITY SENSOR TIP REPLACEMENT Humidity sensor Hold the tip here. Do not touch the humidity sensor itself. The sensor tip will require replacement eventually, to insure correct humidity readings. When replacing the sensor tip, make sure that you fit it in the right direction. The sensor tip will fit into the socket in one direction only (see Figure 6). Version 2.01 JA20120119 NMC Sensors Page 10

6.2.3 INSIDE TEMPERATURE AND HUMIDITY BOX INSTALLATION The NMC Inside Temperature and Humidity Box is supplied with a galvanized mounting chain and hook for installation. All spare parts (sensors, fan and bridge rectifier) are sold separate, so it will not be necessary to replace a complete box under normal operating conditions. Consider the following during installation: Maximum preferred cable length (0.8mm) from Box to NMC controller is 100m Install one box per 2500 m² of greenhouse area Install the galvanized hook at the box, to enable height adjustment of the box as the crop height changes Minimum distance from greenhouse structure 0.5m In lightning prone areas, do not fasten the mounting chain to the greenhouse structure, use a length of rope and install only enough chain for box height adjustment. This will isolate the box from the greenhouse structure and prevent lightning damage to the NMC Controller Version 2.01 JA20120119 NMC Sensors Page 11

Climate box Mounting Bracket Eye Bolt Commercial Clamp 5mm GI Wire rope 20mm PVC Cable Conduit fixed to Wire Rope with Cable ties Nylon Rope Fitted for Lightning Protection Double Jacket 6 Core Cable fixed to chain with Cable Ties Climate box Mounting Chain Climate box S-Hook (adjust box height as required) NMC Inside Temp + RH Box Greenhouse post FIGURE 7. TEMPERATURE AND HUMIDITY BOX MOUNTED IN A GREENHOUSE Version 2.01 JA20120119 NMC Sensors Page 12

6.4 WIND SPEED AND DIRECTION SENSOR FIGURE 8. WIND SPEED AND DIRECTION SENSOR 6.4.1 WIND SPEED AND DIRECTION SENSOR SPECIFICATIONS TABLE 5. WIND SPEED AND DIRECTION SENSOR SPECIFICATIONS Subject Details Sensor type Wind speed Wind cups and magnetic switch Wind direction Wind vane and potentiometer Material Wind vane and control head UV-Resistant ABS Wind cups Polycarbonate Anemometer arm Anodised aluminium General specifications Attached cable length 12 m Maximum cable length 100 m Cable type 4 conductor, 0.5 mm² Connector Modular connector (RJ-11) Dimensions 89mm x 83mm x 38mm Weight 1.332 kg Range Wind speed 4-280 km/h Wind direction 0⁰- 360⁰ Accuracy Wind speed ±5% Wind direction ±7% Resolution Wind speed 1km/h Wind direction 1⁰ (1⁰ to 355⁰) Version 2.01 JA20120119 NMC Sensors Page 13

6.4.1 WIND SPEED AND DIRECTION SENSOR CONNECTIONS TABLE 6. WIND SPEED AND DIRECTION SENSOR CONNECTIONS Wire colour Red Black Yellow Green Description Common Digital input - wind speed 5 VDC Sensor supply voltage Analogue input - wind direction 6.4.2 WIND SPEED AND DIRECTION SENSOR INSTALLATION AND ORIENTATION Wind speed and direction sensor Wind speed and direction sensor arm Weather station mounting arm Weather station pole FIGURE 9. WIND SENSOR COMPONENTS Install the weather station sensors onto the weather station mounting arm. Install the weather station onto the supplied pole. Wire the sensors into the controller making sure that there is enough slack on the cable to mount the pole in its place later. Before mounting the pole, check the wind direction value. Loosen the grub screw and remove the Wind Vane. FIGURE 10. REMOVE WIND VANE Version 2.01 JA20120119 NMC Sensors Page 14

Using your fingers, turn the stainless steel wind direction shaft until the value on the NMC controller is 0. Allow 5 seconds for the value to stabilize before checking it. (Figure 11) FIGURE 11. ZERO THE WIND DIRECTION SHAFT Replace the wind vane with the bullet-shaped nose pointing in the same direction as the Wind speed and direction arm. (Figure 12) FIGURE 12. WIND SENSOR NOSE AND ARM IN SAME DIRECTION Push the wind vane onto the stainless steel shaft. Take care not to disturb the position of the shaft when doing this. (Figure 13) FIGURE 13. PUSH THE WIND VANE DOWN ONTO THE SHAFT Version 2.01 JA20120119 NMC Sensors Page 15

Fasten the grub screw to hold the wind vane in place. (Figure 14) FIGURE 14. FIX THE WIND VANE TO THE SHAFT Your Wind Direction pointer is now oriented to 0. Install the pole onto its brackets but do not tighten the u-bolts yet. Using a compass, turn the pole until the Wind Speed and Direction arm is pointing north. (Figure 15) North FIGURE 15. ORIENT THE WIND SENSOR ARM Fix your pole to the bracket. The weather station is now installed. See 6.8 Weather Sensor Mounting Arm Installation 6.4.2 WIND SPEED AND DIRECTION SENSOR MAINTENANCE The NMC Wind Speed and Direction sensor does not require regular maintenance, nevertheless in highly polluted conditions it is recommended to clean the sensor surfaces with clean water from time to time. Version 2.01 JA20120119 NMC Sensors Page 16

6.5 RAIN SENSORS 6.5.1 RAIN DETECTOR SENSOR 6.5.1.1 RAIN DETECTOR SENSOR SPECIFICATIONS TABLE 7. RAIN DETECTOR SENSOR SPECIFICATIONS Details Units Power voltage 9 VAC Power consumption (electronic + heating) 3 VA Ambient temperature -20⁰ to 60⁰C Storage temperature -30 to 70 C for relative humidity of 0 to100% Drop-out time 5 minutes (±20%) Relay output 10 A, 250 VAC Housing material PVC Protection class IP 66 Weight including mounting and power supply 0.9 kg 6.5.1.2 RAIN DETECTOR SENSOR CONNECTIONS TABLE 8. RAIN DETECTOR SENSOR CONNECTIONS Wire colour White Green Normally closed Common Description Connect white terminal of power supply to white terminal of sensor Connect green terminal of power supply to green terminal of sensor Digital Input Digital Input Common 6.5.1.3 RAIN DETECTOR SENSOR MOUNTING Screw the mounting plate to a solid mounting surface or to the weather station mounting arm through the access holes. Open the box and attach it to the mounting plate as shown in Figure 14. Version 2.01 JA20120119 NMC Sensors Page 17

FIGURE 16. RAIN DETECTOR SENSOR MOUNTING 6.5.1.4 RAIN DETECTOR SENSOR INSTALLATION AND MAINTENANCE The installation of the rain detector, its connection to a controller and its power supply is explained by the wiring detailed in Section 2.1.15.4 Connection Wiring Rain Sensor (On/off) of the CMT Manual. Power must be disconnected prior to opening the enclosure to avoid electrical shock. The Rain Detector does not require regular maintenance, nevertheless in highly polluted conditions it is recommended to clean the sensor surface with clean water from time to time. Version 2.01 JA20120119 NMC Sensors Page 18

6.5.2 RAIN COLLECTOR SENSOR The NMC Rain Collector measures rainfall quantities. When using a Rain Collector it is not necessary to use a Rain Detector. The NMC controller will be put in a rain status by its software as soon as rainfall is being measured. The rain sensor consists of a measuring spoon that flips every time it accumulates a specific quantity. Every flip is counted and transformed to quantities FIGURE 17. RAIN COLLECTOR SENSOR 6.5.2.1 RAIN COLLECTOR SENSOR SPECIFICATIONS TABLE 9. RAIN COLLECTOR SENSOR SPECIFICATIONS Sensor Type Output Subject Attached Cable Length Maximum Cable Length Cable type Housing Material. Diameter Details Tipping bucket with magnetic reed switch Dry contact 12 m 100 m 2-conductor, 0.5 mm² 0.254 mm 165 mm Height 240 mm Collection Area 200 cm 2 Weight Resolution. Accuracy. 1 kg UV-stabilized ABS plastic ±3%, ±1 Rainfall count between 50.0 mm and 150.0 mm/h ±2%, ±1 Rainfall count between 0.20 mm and 50.0 mm/h Version 2.01 JA20120119 NMC Sensors Page 19

6.5.2.2 RAIN COLLECTOR SENSOR CONNECTIONS TABLE 10. RAIN COLLECTOR SENSOR CONNECTIONS Wire colour Red Black Description Digital input Common Version 2.01 JA20120119 NMC Sensors Page 20

6.6 RADIATION SENSORS 6.6.1 RADIATION SENSOR DAVIS This radiation sensor is a photodiode type sensor that measures light intensity. It is normally used for climate control and not irrigation control. FIGURE 18. RADIATION SENSOR DAVIS Version 2.01 JA20120119 NMC Sensors Page 21

6.6.1.1 RADIATION SENSOR DAVIS - SPECIFICATIONS TABLE 11. RADIATION SENSOR DAVIS - SPECIFICATIONS Sensor Type Subject Spectral range (10% points) Attached cable length Details Silicon photodiode 400 to 1100 nanometres 12 m Maximum cable length 100 m Cable type 4-conductor, 0.5 mm 2 Connector Housing material Dimensions Weight Cosine response Modular connector (RJ-11) UV-resistant plastic 51 mm x 70 mm x 57 mm 0.34 kg Percent of reading ±3% (0 to ±70 incident angle) ±10% (70 to ±85 incident angle) Percent of full-scale ±2% (0 to ±90 ) Range Solar radiation intensity Solar energy Accuracy 0 to 1500 W/m² 0 to 1999 Langleys Solar global radiation intensity ±5% Solar energy ±5% Resolution Solar radiation intensity Solar energy 1 W/m² 1 Langley Temperature coefficient -0.063% per ⁰C Reference temperature = 22⁰C 6.6.1.2 RADIATION SENSOR DAVIS - CONNECTIONS TABLE 12. RADIATION SENSOR DAVIS - CONNECTIONS Wire colour White Red Yellow Description Output (0 to +3VDC); 1.67 mv per W/m² Common +5 VDC ±10%; 3mA (typical) Version 2.01 JA20120119 NMC Sensors Page 22

6.6.2 RADIATION SENSOR NETAFIM This radiation sensor is normally used for radiation sum irrigation control. FIGURE 19. RADIATION SENSOR NETAFIM 6.6.2.1 RADIATION SENSOR NETAFIM - SPECIFICATIONS TABLE 13. RADIATION SENSOR NETAFIM - SPECIFICATIONS Subject Details Measuring principle Temperature difference Spectral range 300 to 2800 nanometres Power supply 10 30 V Power consumption < 1 W Impedance < 50 Ω Sensitivity 2mV per W/m² Housing IP67 Accuracy daily sum Better than 10% Zero offset < 20 W/m² Connections 3 Wire: Supply, Output and Ground Dimensions 80mm x 55mm Version 2.01 JA20120119 NMC Sensors Page 23

6.6.2.2 RADIATION SENSOR NETAFIM - CONNECTIONS TABLE 14. RADIATION SENSOR NETAFIM - CONNECTIONS Wire colour White Brown Green Black Description Analogue input 12 DVC sensor supply Common Earth 6.6.2.3 RADIATION SENSOR NETAFIM MAINTENANCE The NMC Radiation Sensor Netafim does not require regular maintenance, nevertheless in highly polluted conditions it is recommended to clean the sensor dome with clean water from time to time. Version 2.01 JA20120119 NMC Sensors Page 24

6.7 CO 2 SENSOR The CO2 measurement is based on non-dispersive infrared (NDIR) technology. The auto-calibration procedure compensates for aging of the infrared source and guarantees high reliability, long term stability and eliminates the need of periodical calibration in the field. FIGURE 20. CO 2 SENSOR 6.7.1 CO2 SENSOR SPECIFICATIONS TABLE 15. CO2 SENSOR SPECIFICATIONS Subject Details Measuring principle Non-dispersive infrared (NDIR) technology Measuring range 0 7000ppm Supply Voltage 24 VAC ±20% Power consumption < 3 W Warm up time < 5 min Sampling rate 30 sec Housing IP65 Accuracy at 20 C and 1013 mbar < ± (50ppm +5% of measured value) Long term stability Typically 20ppm / year Working conditions -20 to 60 C and 0 to 100% RH Dimensions (W x H x D) 80mm x 80mm x 50mm 6.7.2 CO2 SENSOR MAINTENANCE The NMC CO2 Sensor does not require regular maintenance, nevertheless in highly polluted conditions it is recommended to clean the sensor outside with a clean damp cloth Version 2.01 JA20120119 NMC Sensors Page 25

6.8 WEATHER SENSOR MOUNTING ARM INSTALLATION The NMC Weather Sensor Mounting Arm is made from aluminium and supplied with all the screws and clamps required to install the weather station sensors. Consider the following during installation: Maximum cable length (0.8mm OD) from weather station to NMC controller is 100m Minimum height above the highest structure (greenhouse, pump room or farm office) surrounding the weather station installation is 1m Install weather station with wind speed and direction sensor black support arm pointing north Install rain sensor (ON/OFF) facing the prevailing rain direction Level weather station for accurate sensor readings In lightning prone areas earth the weather station installation with at least a 10mm² earth cable, connect earth of weather station to earth of NMC controller and protect with a lightning rod. Solar radiation Outside temperature and humidity Wind speed and direction Rain (on/off) Weather station mounting arm Mounting pole Rain collector FIGURE 21. WEATHER SENSOR MOUNTING ARM AND SENSORS Version 2.01 JA20120119 NMC Sensors Page 26