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Enabling better global research outcomes in soil, plant & environmental monitoring.

CH24 - 24 Volt Power Supply

The CH24 is a 100 - 240Volts AC Mains to 24Volts DC power supply adapter; capable of outputting up to 2.5Amps.

Compatible ICT Instruments can be powered continuously by the CH24 for use in laboratory applications, or the CH24 can be used to charge instruments such as the AIM1 before use in the field.

The continuous power consumption by ICT Instruments is dependent upon many variables. E.g. for VSL & AML it is dependent on the number of sensors, type of sensors, if sensors are powered continuously and the logging interval of measurements. For a SFM1 the heat pulse and logging interval also affect the power consumption.

ICT recommend using a 24Volts DC power supply like the CH24 to recharge ICT Instruments every 3 months to ensure longevity of internal batteries.

ICT Instruments require a 8Volts minimum to 30Volts maximum DC power supply. The maximum battery charging external power draw set by the charge controller in a SFM1, PSY and VSL is 3.2Watts. For the AML and HFD it is 6.8Watts.

When ICT Instruments are fully charged the continuous external power draw is approximately 0.9Watts for the SFM1, PSY1 and VSL loggers.


DC Voltage 24V
Rated Current 2.5A
Current Range 0 – 2.5A
Rated Power (max.) 60W
Ripple and Noise (max.) 180mVp-p
Voltage Tolerance ±3%
Line Regulation ±1%
Load Regulation ±3%
Setup, Rise Time 1000ms, 30ms / 230VAC; 1000ms, 30ms / 115VAC at full load
Hold Up Time (Typ.) 50ms/230VAC; 15ms/115VAC at full load


Voltage Range 90 – 264VAC; 135 – 370VDC
Frequency Range 47 – 63Hz
Efficiency (Typ.) 90%
AC Current (Typ.) 1.4A/115VAC; A/230VAC
Inrush Current (max.) 65A/230VAC
Leakage Current (max.) 0.75mA/240VAC


Overload 105 – 150% rated output power
Over Voltage 25.2 – 32.4V
Over Temperature Shut down output voltage, re-power on to recover


Working Temp. -30 to +60°C
Working Humidity 20 to 90% RH Non-Condensing
Storage Temp., Humidity -40 to +85°C, 10 to 95% RH
Temp. Coefficient ±0.03% / °C (0 to 40°C)
Vibration 10 to 500Hz, 2G 10min./1 cycle, period for 60 min. each along X, Y, Z axes

Safety and EMC

Safety Standards UL60950-1, CSA C22.2, TUV EN60950-1, BSMI CNS14336, CCC GB4943, PSE J60950-1 approved
Withstand Voltage I/P-O/P:3KVAC I/P-FG:2KVAC O/P-FG:0.5KVAC
Isolation Voltage I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC Emission Compliance to EN55022 class B, EN61000-3-2,3, FCC PART 15 / CISPR22 class B, CNS13438 class B, GB9254, GB17625.1
EMC Immunity Compliance to EN61000-4-2,3,4,5,6,8,11, light industry level, criteria A


MTBF 711K hours minimum (25°C)
Dimensions 125*50*31.5mm (L*W*H)