ACR Electronics SmartReader Plus Instrukcja Użytkownika Pobierz pdf (Strona 34)

SmartReader Data Loggers

Pressure Measurement Precautions

The SmartReader 4 is designed for long-term, trouble-free performance but there are a few

precautions to keep in mind to maximize the benefit it can give you.

· The pressure sensor in the Pressure Module is compatible with non-corrosive gases

and dry air. It is not to be used for liquid pressure measurements.

· Always try to make your pressure connections separate from the Pressure Module and

logger. To do this, leave a short length of tubing continually attached to the input port.

Stressing the input connection may cause it to break, resulting in erroneous readings.

EH-020A Remote Temperature & RH Probe

The EH-020A is a four-wire probe with a temperature and relative humidity sensor. For

field-mounting convenience, it also has a magnetic backing and a security eyelet. To use the

EH-020A with your SmartReader 4, you must enable the logger's external temperature and

humidity channels. To connect the EH-020A probe to your SmartReader 4, follow instruction

notes packed with each RH probe set -- see Figure 4-2.

Remote Thermistor Temperature Probe

You can monitor temperatures remotely using an ET temperature probe with your

SmartReader 4 by connecting the probe's two wires to the Temperature and Common

terminals. Make sure the External Temperature channel is activated and proper equation is

selected.

1.6.3 Pressure Calibration

The pressure sensor (in the Pressure Module), although subject to accuracy degradation

when exposed to contaminants and/or extreme environmental conditions, will drift typically

less than 1%/year (under clean conditions). You should check your SmartReader 4

periodically and, if necessary, recalibrate or replace the Pressure Module. In the event that

you wish to confirm the pressure calibration of your SmartReader 4 Logger, you can perform

your own calibration using the adjustment provisions explained in TrendReader software.

The recommended method of calibration is to use a pneumatic pressure calibrator with a

preferred accuracy of at least 0.1% full scale. All the pressure modules can be calibrated with

an offset and a gain up to ±5% of full scale.

Procedure

The Low calibration value is a zero adjustment and the Mid calibration value compensates for

span. The calibration procedure is as follows:

1. Activate the pressure and temperature monitoring channels of your SmartReader 4 if not

already enabled.

2. Set all calibration values to Zero.

3. Ensure that the correct equation is selected.

4. With the input port unconnected (open to ambient), Record the pressure reading you see

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ACR Electronics SmartReader Plus Instrukcja Użytkownika Strona 34