Recorder A542 (A-542, a542, a-542)
Registrar A542 - Two-channel analog product intended for measuring and recording the values of the process parameters on the band diagram of thermocouples and RTD sensors having uniform output signals and for signaling the status of the process parameters.
Main technical characteristics of A542:
- The number of independent channels - 2;
- Speed - 1.0, 2.5, 5, 10 s;
- The nominal average speed chart paper - 20, 40, 80, 160, 320, 640, 1280, 2560 mm / h;
- The number of settings control (signaling) - 1 per channel.
- PR thermocouple (B), PP (S or R), HA (K), HC (L);
- Resistance thermal 10P, 50P, 100P, 10M, 50M, 100M;
- Voltage from 100mV to 0mV;
- Currents from 20mA to 0mV;
- Radiation pyrometers from 0 mA to 20 mA.
A542 devices are widely used in systems of control and management of the technical processes of metallurgy, power, refining and petrochemical, food and other industries.
Device A542vypolnen in steel, rectangular in shape, measuring 80 × 160 × 590 mm, the shield performance. Weight of the device - no more than 12.5 kg.
- Voltage - 220V;
- Frequency of 50Hz;
- Power - 24W.
The unit has an LED display A542 "appliances are included."
Operating position registrars A542 vertical scales, scale length and width of the chart paper of 100 mm. Recording - a continuous line, the release writing device - no more than 2.5 mm. For units with a speed of 1 second after a sudden change of the input signal from the lower to the upper limits allowed breaks line registration will not result in a loss of information. Visits pointers A542 for the extreme of the scale is not less than 1 mm. On the premises of writing devices A542 relative to each other in the coordinate time - not more than 3.5 mm. The number of vibrations pointer device near the equilibrium - no more than 3.
Output devices registrar A542 - one two-point alarm device (two independent set points, relay 30V / 0.2A or 127V / 0,13 A). Current output from 0 mA to 5 mA or 4 mA to 20 mA (without linearization).
Signaling device devices A542 is at the output of a contact group on the switch, designed for connecting a resistive load to the characteristics:
- DC voltage up to 30 V at a current of 0.2 A
- AC voltage up to 127 V at a current of 0.13 A.
Measuring range conforms to the requirements of GOST 18140. The reference range alarm settings - 0-100% range of the output signal. Variation A542 readings does not exceed the basic error indications. Key value error of the instrument filed in Table 1.
Change error registrars indications caused by changes in ambient temperature of (20 ± 2) ° C and the upper (lower) of the work, as a percentage of the fiducial value does not exceed the values defined by the formula:
Δ I n (t) = K 1 [(t a (n) - t n)],
where K 1 - the coefficient of proportionality, equal to 0,015% / ° C;
t a (n) - the upper (lower) of the ambient temperature to the operating conditions;
t n - the temperature for normal conditions.
Change error A542 on alarm caused by changes in ambient temperature from plus (20 ± 2) ° C and the upper (lower) of the work, expressed as a percentage of the fiducial value does not exceed the values defined by the formula:
With Δ I (t) = K 1 [(t a (n) - t n)],
where K 1 - proportionality coefficient equal to 0,03% / ° C; t a (n), t n - is the same as in formula (1).
Changing the instrument error caused by varying the supply voltage to plus 10 and minus 15% as a percentage of the fiducial value, does not exceed: for the testimony of 0.25, 0.5 signaling the nominal value.
Change error registrars due to the influence of external magnetic field of 400 A / m, formed nearly sinusoidal current frequency of 50 Hz, expressed as a percentage in the most unfavorable phase and the direction of the field does not exceed: for the testimony of 0.5 by 0.8 by signaling the fiducial value.
Change error A542 on the testimony and the alarm caused by the influence of the interference voltage of normal form, equal to 5% of reference range (for devices with input DC voltage), or 5% of the product range changes in the input signal to the input impedance (for devices with input DC power signal), and having any phase angle is not more than 0.5% of the fiducial value.
Changing device error caused by the influence of common mode voltage equal to the variation range of the input signal (for the input devices to the DC voltage), or the product range of the input signal to the input impedance (for input devices with constant current), and having any phase angle does not exceed: indications for 0.25, 0.5% of signaling fiducial value.
Electrical isolation circuits registrar A542 relative to the housing between a chain and at ambient temperature (20 ± 5) and a relative humidity of 80% stand for 1 minute test voltage AC practically sinusoidal frequency of 50 Hz in accordance with Table 2.
The insulation resistance circuits and devices relative to the housing between a circuit should not be less than the values shown in Table 3.
For devices intended for use in the measurement of flow, speed of the chart paper should not be less than 80 mm / h The mean speed of the chart paper does not exceed ± 1,0% of its nominal value.
With Sostenuto time between the device - 20,000 hours.
A542 recorders are designed to operate at an ambient temperature of 5 ° C to 50 ° C and the upper level and 80% RH (at 35 ° C) and lower temperatures without condensation. A complete T Average lifetime to write off at least 10 years of age.