Using the EF-Series Unit
2-36 Rev 2/01
Main Specifications
PROCESSOR INFORMATION
Motorola 32 bit, running at 14.7 MHz.
Program Memory:
512 Kbyte flash ROM (electrically
programmable) for firmware and configuration.
Data Memory:
512 Kbyte SRAM, super capacitor-
backed for up to 4 weeks.
Memory Reset:
A reset jumper enables a cold start
initialization when used during power-up.
TIME FUNCTIONS
Clock Type:
32 kHz crystal oscillator with regulated
supply, super capacitor-backed. Year/Month/Day and
Hour/Minute/Second, with Daylight Savings Time control.
Clock Accuracy:
0.01%.
Watchdog Timer:
Hardware monitor expires after 1
second and resets the processor.
DIAGNOSTICS
These conditions are monitored and alarmed: SRAM
validity/operation, Sensor and RTD point fail, battery and
charging voltages, internal temperature.
COMMUNICATIONS
Operator Interface:
EIA-232 (RS-232D) format.
Software configured, 600 to 19.2K baud rate selectable.
Screw-cap protected connector.
Host:
Serial or modem interface, when optional
communications card is installed.
POWER
Battery Input:
8 to 15 Vdc (normally 10.8 Vdc to start
up). 0.2 W typical, including Sensor power, but exclud-
ing power for discrete output load and communications
card.
Charging Input:
14 to 22 Vdc. Charge current internally
limited to 1.0 amp.
LOCAL DISPLAY
2 line by 16 character LCD. Continually updates
approximately every 3 seconds. See Environmental
specification for operating temperature.
FLOW SENSOR (BUILT-IN)
See Specifications table in Section 4.
RTD INPUT (BUILT-IN)
Quantity/Type:
Single input for a 2, 3, or 4-wire RTD
element.
Terminals:
“Ref” current source, “+” signal positive
input, “-” signal negative input, and “Ret” return
(common).
RTD INPUT (BUILT-IN) (CONTINUED)
Sensing Range:
-50 to 100° C (-58 to 212° F).
Accuracy:
±0.56° C (1.0° F) over sensing range
(includes linearity, hysteresis, repeatability).
Ambient Temperature Effects per 28° C (50° F):
±0.50° C (.90° F) for process temperatures from -40
to 100° C (-40 to 212° F).
Filter:
Band-pass hardware filter.
Resolution:
16 bits.
Conversion Time:
100 µsec.
Sample Period:
1 sec minimum.
DISCRETE OUTPUT (BUILT-IN)
Quantity/Type:
1 sourced, high-side switched
output.
Terminals:
“+” positive output, “-” negative
(common).
Voltage:
Same as applied to Battery Input minus
0.7 volts.
Frequency:
1.5 Hz maximum.
Sample Period:
200 ms minimum.
Current Limit:
300 mA, automatic reset.
ENVIRONMENTAL
Operating Temperature:
-40 to 75 °C (-40 to 167
°F), excluding LCD display, which is -25 to 70 °C
(-13 to 158 °F).
Storage Temperature:
-50 to 85 °C (-58 to 185
°F).
Operating Humidity:
5 to 95%, non-condensing.
Vibration:
Tested to SAMA 31.1 Condition 3, with
an abbreviated endurance dwell test.
Radiated/Conducted Transmissions:
Complies
with requirements for Class A Information Tech-
nology Equipment per EN 55022 (1995) and
CISPR 22 (1993). Also complies with FCC Part 15
Class A.
Voltage Surge Immunity:
Designed to meet IEC
801-4 and IEC 801-5, as required by EN 50082-2.
ENCLOSURE
Construction:
Powder-coated 14-gauge carbon
steel with lockable hasp and gasketed door.
Coating is light gray polyurethane paint. All
unpainted hardware is stainless steel. Meets CSA
Type 4 rating (NEMA 4 equivalent).
Wiring access:
Three 0.88 in. pre-punched holes
in bottom.
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