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The ST-2A is the perfect bench com-panion product to the Ashcroft® ATE-100 fi eld handheld calibrator. This bench top (or panel mounting) package shares the same pressure and temperature modules and interfaces with the same software packages as the Ashcroft ATE-100. An intuitive, menu-driven user interface puts all of the ST-2A’s power at the simple press of a key. It uses the AQS (Ashcroft Quick-Select™) modular sensor system to provide the ultimate in measurement flexibility.
Standard Display: Alphanumeric LCD, 0.37-inch
height, 2 lines, 16 characters/line
Optional Display: Backlit LCD alphanumeric with 2
lines and 16 characters/line
Display Resolution: ±0.002% of span, 60,000
counts (max)
Display Update Rate: 130ms (nominal) with one
sensor installed
Engineering Units: psi, in.H2O, in.Hg, ftSW, bar,
mbar, kPa, MPa, mmHg, cmH2O, mmH2O and
kgcm2 and any single user-programmable
engineering unit
Damping: Programmable averaging from zero
through 16 consecutive readings
Standard Operating Range: 32° to 120°F (0 to
49°C)
Compensated Range: 20° to 120°F (–7° to +49°C)
Reference Temperature: 70 ±3°F
Standard Temperature Effect: ±0.004% of span per degree Fahrenheit over the compensated range
Optional: AQS-2 Quick-Select modules are available calibrated to maintain rated accuracy over the 20° to 120°F (–7° to +49°C) compensated temperature range.
Storage Limits: –4°F to +158°F (–20° to +70°C)
Electrical Sourcing Specification: 24 Vdc at 25mA
Electrical Measurement Specification:
Input (volts) Accuracy
0/10 Vdc ±0.025% F.S.
0/30 Vdc ±0.10% F.S.
Input (mA) Accuracy
0/20mA ±0.03% F.S
Temperature Effects Electrical Measurement:
±0.001% of span per °F over the compensated range
Weight: ST-2A Base unit: 3.0 lb (1.4 kg)
Housing: Molded, high-impact ABS case
Electrical Connections: Standard banana jacks
Optional Battery Power Supply: 5 “AA” nicads with
built-in charger or 5 “AA” alkaline (nonrechargeable)
External Power Supply: AC adaptor 9 Vdc, 500mA
Portable Operation: 20 hours with optional backlight
off, 2 hours with backlight on
Warm-up: 5 minutes for rated accuracy (maximum),
30 minutes for complete stability
RS232 Serial Interface: with 9-pin D type at 300,
1200, 2400, 9600 baud.
Field Calibration: Calibration module and proper
pressure and electrical standards are required.
Optional Data Logging Capacity:
Standard measurements: 714 records
Date/time stamped measurements: 384 records
Provides prompts for storage of calibration
history information, including instrument tags,
As Found/As Left data and corresponding
ambient temperature
height, 2 lines, 16 characters/line
Optional Display: Backlit LCD alphanumeric with 2
lines and 16 characters/line
Display Resolution: ±0.002% of span, 60,000
counts (max)
Display Update Rate: 130ms (nominal) with one
sensor installed
Engineering Units: psi, in.H2O, in.Hg, ftSW, bar,
mbar, kPa, MPa, mmHg, cmH2O, mmH2O and
kgcm2 and any single user-programmable
engineering unit
Damping: Programmable averaging from zero
through 16 consecutive readings
Standard Operating Range: 32° to 120°F (0 to
49°C)
Compensated Range: 20° to 120°F (–7° to +49°C)
Reference Temperature: 70 ±3°F
Standard Temperature Effect: ±0.004% of span per degree Fahrenheit over the compensated range
Optional: AQS-2 Quick-Select modules are available calibrated to maintain rated accuracy over the 20° to 120°F (–7° to +49°C) compensated temperature range.
Storage Limits: –4°F to +158°F (–20° to +70°C)
Electrical Sourcing Specification: 24 Vdc at 25mA
Electrical Measurement Specification:
Input (volts) Accuracy
0/10 Vdc ±0.025% F.S.
0/30 Vdc ±0.10% F.S.
Input (mA) Accuracy
0/20mA ±0.03% F.S
Temperature Effects Electrical Measurement:
±0.001% of span per °F over the compensated range
Weight: ST-2A Base unit: 3.0 lb (1.4 kg)
Housing: Molded, high-impact ABS case
Electrical Connections: Standard banana jacks
Optional Battery Power Supply: 5 “AA” nicads with
built-in charger or 5 “AA” alkaline (nonrechargeable)
External Power Supply: AC adaptor 9 Vdc, 500mA
Portable Operation: 20 hours with optional backlight
off, 2 hours with backlight on
Warm-up: 5 minutes for rated accuracy (maximum),
30 minutes for complete stability
RS232 Serial Interface: with 9-pin D type at 300,
1200, 2400, 9600 baud.
Field Calibration: Calibration module and proper
pressure and electrical standards are required.
Optional Data Logging Capacity:
Standard measurements: 714 records
Date/time stamped measurements: 384 records
Provides prompts for storage of calibration
history information, including instrument tags,
As Found/As Left data and corresponding
ambient temperature
Temperature Interface Modules
AQS (Ashcroft Quick-Select) modules offer the ultimate in “plug-and-play” flexibility. They can be inserted and removed at the push of a button. The ST-2A automatically recognizes the sensor with no need for adjustments.
The AQS-1 pressure module provides ultralow pressure measurement solutions from 0/0.25 inches of water to 0/200 inches of water in gauge, compound and differential. They are designed for clean dry gas service and are durable with up to 1440 inches of water (50 psi) overpressure capability.
The AQS-2 pressure module provides ranges from 5 to 10,000 psi in gauge, vacuum, absolute and compound with 316SS isolation for severe media service available.
The AQS-RT temperature module provides an interface for 2, 3, and 4 wire RTDs. It is factory programmed with standard curves to support Pt100 (385 and 392), Ni 120, Cu 10. Another module supports Pt1000 temperature probes. Both can be programmed to support eight RTD curves.
The AQS-TC1 thermocouple interface module allows the ST-2A to measure temperature with types J, K, T, E, R, S, B and N thermocouples and includes an automatic reference junction.
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