Users’ Manual
EDI-53 Series Digital Indicator
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Memory
32 KB program memory (provided inside the microcontroller) and 64 KB Non Volatile RAM (NVRAM)
data memory.
Data memory provides non volatile storage of 500 transducer calibration constants and 6700 sets of time
stamped data readings. Each data set consists of one parameter reading together with date and time
data was stored.
Real Time Clock
A real time clock is provided for time and date stamping of stored data. RTC is battery backed and will
continue keeping time even if the indicator is kept off for short periods of time. However, if the indicator is
used only sparingly the internal sealed battery will drain off and the RTC will lose time whenever the
indicator is turned off.
RTC time keeping accuracy:
±
2 minutes / month, typical, over the operating temperature range with
indicator powered on. Very sparingly used indicators will show much more variation.
RS-232C Serial port
RS-232C serial output is provided to connect the indicator to a serial printer or IBM compatible PC
equipped with a RS-232C serial interface port.
Baud rate: 2400 baud fixed.
Format: 1 start bit, 8 data bits, no parity and one stop bit.
Data file uploaded to computer is in comma delimited ASCII text file format acceptable to most
commercially available spreadsheet, database and analytical software.
Diagnostics
Power On Self Test plus additional diagnostic utilities are provided.
Power Supply
Internal rechargeable 6V sealed Valve Regulated Lead Acid battery (generally known as maintenance
free battery). A suitable external battery charger is supplied with the indicator for charging the batteries.
Do not use any other charger for charging the battery.
Always use Exide (India) EP4-6 or Hitachi HP4-6 (6M4) Sealed Maintenance Free battery or equivalent
from other manufacturers for replacement. Different manufacturers specify battery rating as 6V/ 4Ah, 6V/
4.2Ah, 6V/ 4.5Ah etc, any of them can be used.
Power consumption
Less than 60 mA from battery with Encardio-rite sensors connected at input. The indicator will typically
operate for around 60 hours on a fully charged new battery with sensor connected. Power consumption
reduces if sensor is disconnected from the indicator.
Input / Output Connectors
Circular weather proof 7-pin connector for sensor input and RS-232C serial interface port (combined)
and 3-pin connector for battery charger.
Environment
Operating temperature range: 0 to 45
°
C
Operating humidity range: 10% to 90% (no condensation)
