ISO 21622-2:2023

INTERNATIONAL ISO
STANDARD 21622-2
First edition
2023-07
Irrigation techniques — Remote
monitoring and control for
irrigation —
Part 2:
Tests
Techniques d’irrigation — Surveillance et commande à distance pour
l’irrigation —
Partie 2: Essais
Reference number
© ISO 2023
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Published in Switzerland
ii
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and symbols . 1
3.1 Terms and definitions . 1
3.2 Symbols . 2
4 Functionality .2
4.1 General . 2
4.2 Power tests . . . 3
4.2.1 Consumption . 3
4.2.2 Power loss . 4
4.3 Solenoid valve outputs . 8
4.3.1 Opening/closing solenoid valves . 8
4.3.2 Voltage and current, simulating SV . 9
4.3.3 Solenoid valve pulse width duration . 10
4.3.4 Short circuit and open circuit . 11
4.3.5 Remote unit operation with real solenoids .13
4.3.6 Association of sensors with solenoid valve outputs . 14
4.4 Counter entries . 16
4.4.1 Sensor power supply . 16
4.4.2 Flow calculation . 16
4.4.3 High flow alarm . 17
4.4.4 Low flow alarm . 17
4.4.5 Hardware pulse filtering — Maximum pulse rate and minimum pulse width . 17
4.4.6 Maximum frequency between pulses . 17
4.4.7 Minimum frequency between pulses . 18
4.4.8 Pulse filtering by software with fixed time . 18
4.4.9 Software pulse filtering with configurable time . 18
4.4.10 Minimum time between pulses . 19
4.4.11 Maximum time between pulses . 19
4.4.12 “Open contact” test .20
4.4.13 “Closed contact” test . 20
4.4.14 Random pulse counting test. 21
4.4.15 Concurrent pulse count test . 21
4.4.16 Counter events and alarms . 21
4.5 Analogue inputs . 22
4.5.1 General .22
4.5.2 Measurement accuracy .23
4.5.3 Events and alarms generated by the analogue input . 24
4.6 Other inputs and outputs . 27
4.6.1 Purpose of the test . 27
4.6.2 External signals . . 27
4.6.3 Internal signals .29
4.7 Operating logic .29
4.7.1 General .29
4.7.2 Low supply voltage safety interlock (lockout) test . .30
4.7.3 Low-pressure safety lockout test .30
4.7.4 Excess flow (flow rate) safety shutdown test .30
5 Robustness .31
5.1 Environmental conditions . 31
5.1.1 General . 31
iii
5.1.2 Solenoid valve actuation (SV) . 32
5.1.3 Counter pulses . 32
5.1.4 Analogue readout. 33
5.2 Power supply . 33
5.2.1 Polarity reversal in main power supply . 33
5.2.2 Short-circuit at the SV solenoid valve output . 33
5.3 Accidental wiring errors on inputs and outputs .34
5.3.1 Purpose of the test .34
5.4 Analogue input . 35
5.4.1 Overvoltage (analogue voltage input) . 35
5.4.2 Overcurrent (analogue input by current) . 35
5.4.3 Short circuit . 36
5.5 Communications . 37
5.5.1 Antenna short circuit test . 37
5.5.2 Antenna open circuit test . 37
5.6 Long-term behaviour . 37
5.6.1 Purpose of the test . 37
5.6.2 Test procedure. 37
5.6.3 Acceptance criteria .38
Annex A (Informative) Questionnaire for testing irrigation control systems.39
Bibliography .52
iv
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the wo
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