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E-T-AC3000-DF-V1-12
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E-T-AC3000-DF-V1-12 - 1

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Technical Note Document Type Document title AirChip3000 Description and Main Functions

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E-T-AC3000-DF-V1-12 - 2

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type

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E-T-AC3000-DF-V1-12 - 3

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type Applicability: This manual applies to all devices based on the AirChip3000 with firmware version 3.1 or higher and hardware version 7.0. The AirChip3000 is a programmable, custom designed integrated circuit developed by ROTRONIC and is at the core of the following humidity-temperature measuring devices: o o o o o o o HygroClip2 (HC2) probes HF3 transmitters and thermo-hygrostats HF4 transmitters HF7 transmitter HL20 data loggers HP21 hand-held indicators...

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E-T-AC3000-DF-V1-12 - 4

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type Function overview The AirChip3000 functions fall into two main categories: a) Internal functions • • • Temperature sensor signal conditioning Humidity sensor signal conditioning Sensor failure digital alarm User configurable settings Psychrometric calculations Out-of-limit values Simulator mode Automatic humidity sensor test and drift compensation Sensor failure mode Data recording Humidity-temperature calibration and adjustment The practical relevance of...

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E-T-AC3000-DF-V1-12 - 5

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Document Type INTERNAL FUNCTIONS Technical Note Temperature sensor signal conditioning The resistance [Ohm] of an RTD is a non-linear function of temperature [˚C]. The AirChip3000 uses a 4th degree polynomial to change the temperature signal from the RTD to a linear signal. The default factory values for the polynomial coefficients conform to generally accepted standards (IEC 751 – ASTM E1137) and are shown below: R = R0 (1 + At + Bt 2 + C (t − 100)t 3 ) Default values: R0 = 100 Ω A...

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E-T-AC3000-DF-V1-12 - 6

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type The AirChip3000 holds in memory a set of 31 tables corresponding to temperature values within the range of 100 to +200˚C (see note below). Each table holds compensation data between 0 and 100 %RH in steps of 10 %RH. A temperature of 23˚C is used as the reference. Based on the humidity and temperature data provided by the sensors, the AirChip3000 uses the values from the tables to apply a correction for the effect of temperature on the humidity sensor....

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E-T-AC3000-DF-V1-12 - 7

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type Automatic humidity sensor test and drift compensation The AirChip3000 can be set to test the condition of the humidity sensor at regular intervals of time and to compensate excessive sensor drift. Any humidity sensor can drift progressively due to the chemical effect of contaminants present in the environment. The correction to be applied to compensate for sensor drift was established based on an analysis of defective ROTRONIC Hygromer® sensors collected...

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E-T-AC3000-DF-V1-12 - 8

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Technical Note Document Type Document title Configuration settings of the function Function Configuration Settings Factory default Function enabled Lower limit for sensor test Test Mode NOTE: All default values are subject to future change by the factory. Do not change the current default settings without consulting the factory as this could negatively affect measurement accuracy. o To test the condition of the humidity sensor without applying any correction to the measurements, set the value of...

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E-T-AC3000-DF-V1-12 - 9

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Technical Note Document Type Document title Action table SE: Sensor Error (Test) Test Result Note: The AirChip3000 issues a “Bad” sensor digital alarm only when both of the following conditions are met: (a) the %RH measured prior to the test is at least equal to the lower limit set for the sensor test and (b) the humidity sensor test returns the result “Bad”. Fail safe mode The fail safe mode can be used to prevent an undesirable action by a humidity or temperature control device that relies on the...

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E-T-AC3000-DF-V1-12 - 10

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type Data recording The AirChip3000 can be programmed to record both the humidity and temperature measurement data. The calculated parameter cannot be recorded. The recorded data are retained in the AirChip3000 non-volatile memory. The main characteristics of this function are as follows: - Relative humidity values are recorded with a resolution of 0.1 %RH Temperature values are recorded with a resolution of 0.05˚C / 0.05˚F Memory capacity: 2000 pairs of...

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E-T-AC3000-DF-V1-12 - 11

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type 4.6.2 Date and time The AirChip3000 does not have an internal real time clock and does not keep track of the date and time. An internal time counter ensures that data is recorded at fixed intervals of time as configured by the user. The log interval must be entered as a multiple of 5 seconds. The value of the log interval is retained in the AirChip3000 non-volatile memory. When using the ROTRONIC HW4 software to download recorded data to a PC, the date...

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E-T-AC3000-DF-V1-12 - 12

Rotronic AG Bassersdorf, Switzerland Document code AirChip3000 Description and Main Functions Document title Technical Note Document Type Note: for detailed instructions, please consult the ROTRONIC HW4 software instruction manual or the individual instrument manuals. For both humidity and temperature, adjusting the AirChip3000 is a 2-step process. Please note that the two steps do not have to be carried out at the same time or on the same day. ● Step 1: Calibration Calibration consists in capturing humidity and / or temperature values measured by an instrument at a number of known...

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