PAC Alcor JFTOT II Manual page 46

manometer. This bias is predictable, based
on the density of mercury and the test
fuel. A factory calibrated DPT checked
against an absolute standard, such as a
dead weight tester or air/mercury manom-
eter should read about 6% higher than true
(e.g. DPT reading of 265 mmHg with a
250 mm HG differential pressure applied).
3. Thermocouple Calibration System - The
AutoCal calibration system provides for a
reliable check of the calibration of the entire
temperature indication system by utilizing the
freezing point of Water (°C), 99% pure Tin
(232°C) and pure Lead (327.5°C) as the
standards. The AutoCals consist of a special
heater tube device which has at its middle
section a small well containing the pure Tin
or Lead into which the thermocouple is
immersed. The test thermocouple is intro-
duced into the Tin or Lead after raising the
temperature above the melting point. The
cool-down temperature-time characteristic is
observed by the JFTOT, which determines
the temperature indication at which the
temperature pauses. Any difference between
this reading and the true freezing tempera-
ture is the error in the temperature measure-
ment system. This error is recorded by the
JFTOT and applied as a correction when
displaying subsequent heater tube tempera-
tures.
4. Test Time Measurement - The JFTOT
computer provides all time measurements.
The computer contains a crystal oscillator to
maintain accurate time. The time remaining
in the test is displayed in minutes and sec-
onds.
A2.7 - Technical Specifications
Setpoint range: 180°C to 380°C
Flowrate range: 1 to 10 mL/min
Flowrate accuracy: ±0.1 mL/min for 2 to 10 mL/
min
Page 34
Thermocouple calibration standards:
0°C ice bath
232°C freezing point of pure Tin (Sn)
327.5°C freezing point of pure Lead (Pb)
Thermocouple type: J (Iron/Constantan)
Thermocouple temperature range: -5°C to
+440°C
∆P range: -30 to +400 mmHg (automatically
bypassed at +250 mmHg)
∆P tare timer: 2 min. after heater tube tempera-
ture stable
Operating system pressure range: +450 to +550
psig
Automatic test numbering: 1 to 30,000
Machine I.D.: 1 to 220
Test time range: 4 min. to 500 mL / flowrate for
example: maximum time at 3 mL/min is 166
min.
Fuel aeration timer: 6 min.
Aeration Flowrate: 1.5 L/min (Green)
Coolant Flowrate: 10 Gal/hr (Green)
Heater tube temperature profile timer: 30 min.
after heater tube temperature stablizes
Serial interface: RS232, 19200, 9600, 4800, 2400
Baud no parity, 1 start bit, 1 stop bit, 8 data
bits DTR handshake flow control uses 25-pin
serial cable between JFTOT and printer
transmits standard ASCII format
JFTOT II Temperature range: +5°C to +45°C
Relative Humidity: 0% to 90% non-condensing
Operating power voltage: 115VAC or 230VAC
+15% -10%, single phase
Operating power frequency: 50Hz or 60Hz ±5%
Typical Idle power requirements: 22VA
Typical Operating power requirements: 250VA
(at 260°C, 3mL/min, 500psig)
Absolute Maximum power requirements: 700VA
Printer Power Receptacle (Outlet) Rating 120
VAC, 1.5 Amps
JFTOT II Operation Manual Rev. C