SM 04L01A01-01E
1-2
1.2.3 Scanner Assembly
An in-house SSR (solid state relay) is being used for the scanner. The SSR, having a
semiconductor switch, has a withstand voltage as high as 1500 V and a leakage current
of only 1 nA. For that reason, it has the following features.
1) Semi-infinite life due to the absence of mechanical contacts
2) Silent operation
3) No occurrence of thermoelectric power.
On the other hand, compared to a mechanical relay, the SSR has, the disadvantage of a
bigger ON resistance and OFF capacity. As a result, RTD measurement and noise
resistance characteristics are affected. Regarding RTD measurements, a differential
amp was inserted into the previously mentioned analog circuit without increasing the
number of parts, so that it would receive no influence from ON resistance.
For RTD measurements there is generally no insulation between channels.
1.3 Data Storage Functions
For storing data, the DX has 1.2 MB of internal memory and is equipped with a 3.5-inch
floppy disk drive (1.44 MB 2HD), a Zip drive, or an ATA flash memory card drive. The
measured data can also be saved to external storage media such as floppy disks, Zip
disks, and ATA flash memory cards.
1.4 Display Unit
The DX has a 5.5-inch (DX100) or 10.4-inch (DX200) TFT color LCD on which it displays
the measured results (240 (vertical)
×
320 (horizontal) pixels for the DX100 or 480
(vertical)
×
640 (horizontal) pixels for the DX200).
1.5 Calculation Function
The DX performs differential computation, linear scaling, and square roots using a
microprocessor on the CPU board.
1.6 Alarm Function
The following six alarm types can be set.
High limit (H), low limit (L), differential high limit (h), differential low limit (l), rate-of-
change on increase (R), rate-of-change on decrease (r), alarm delay upper limit alarm
(T), or alarm delay lower limit alarm (t).
1.7 Other Functions
1
Communication function:
Ethernet (standard)
RS-232/RS-422A/FOUNDATION Field bus interface added (optional).
2
Remote function:
The trigger, start/stop, time adjustment, and other functions can be controlled
remotely (optional).
3
Relay contact:
Alarm output and memory end/fail output (optional).
4
Transmitter power supply:
DC24 V output for transmitter (optional).
1.2 Input Section/1.3 Data Storage Functions/1.4 Display Unit/1.5 Calculation Function/1.6 Alarm Function/1.7 Other Functions