• PPCH-G Automated Gas Pressure Controller / Calibrator

  • Đăng ngày 10-07-2017 03:23:07 AM - 992 Lượt xem
  • Giá bán: Liên hệ

  • High performance pressure control to 100 MPa (15,000 psi)

    • For gas pressures up to 15,000 psi (100 MPa)
    • AutoRange feature
    • One or two Q-RPTs in each controller with 10:1 turndown
    • Supports external reference pressure transducers
    • FLASH memory for simple and free embedded software upgrade

Số lượng

Quartz Reference Pressure Transducer (Q-RPT) Modules

PPCH-G's outstanding pressure measurement specifications are made possible by the exclusive quartz reference pressure transducer (Q-RPT) modules.

Q-RPTs measure pressure by measuring the change in the natural oscillating frequency of a quartz crystal with pressure induced stress. To be qualified for use in a Q-RPT module, each transducer is individually evaluated and characterized using automated primary pressure standards. Only transducers exhibiting required levels of linearity, repeatability and stability are selected. A proprietary compensation model, derived from more than 15 years experience with thousands of quartz pressure transducers, is applied to optimize the metrological characteristics needed in a transfer standard.

PPCH-G can be delivered with a low cost utility sensor for applications in which the high precision and stability of a Q-RPT are not required.

Q-RPTs available for PPCH-G

Q-RPT Designation

SI Version

Maximum Range

Absolute Gauge


US Version

Maximum Range





15 000



10 000



6 000



3 000



1 500



1 000

Infinite Ranging™ and AutoRange™

There's a lot more to covering a wide range of test devices with a single gas pressure controller than "% of reading" measurement uncertainty.

In addition to the necessary measurement uncertainty, PPCH-G offers the full pressure control and feature adaptability that are needed for true rangeability in test and calibration applications. Infinite Ranging gives PPCH-G unprecedented versatility in adapting to a wide variety of devices to be tested. With the easy to use AutoRange function, a few simple key strokes or a single remote command string at the start of a test adapts every feature of the gas pressure controller to optimize it for a specific range.

Open architecture

A PPCH-G controller can be configured with up to four Q-RPTmodules. These can be internal or external to the PPCH-G controller. External Q-RPTs are in RPM4™ Reference Pressure Monitors. The RPM4's Q-RPTs then become part of the PPCH-G system and are managed by PPCH-G. External Q-RPTs must be disconnected or protected by valves when PPCH-G is used at pressure greater than the external Q-RPT range.

Examples of possible PPCH-G system configurations include:

  • A PPCH-G with one or two built-in Q-RPTs to act as a stand alone, "one box" controller/calibrator package.
  • A PPCH-G with no internal Q-RPTs and an external Q-RPT to configure a system whose reference pressure measurement is remote from the controller. This configuration is ideal when it is advantageous for the reference to be removed from the system (e.g. for recalibration) while leaving the controller installed or to locate the reference measurement in closer proximity to the device or system under test.
  • A PPCH-G with a built-in Q-RPT to automate pressure controll to a PG7202 piston gauge.
  • A PPCH-G with no built-in Q-RPTs to act as a lower cost automated pressure setting and controlling device. 

PPCH-G General Specifications

Power Requirements 85 to 264 VAC, 50/60 Hz, 75 W max
Temperature Range 15 to 35 °C
Vibration Meets MIL-T-28800D
Weight (Typical) 32 kg approx (70 lb)
Dimensions 30 cm H x 52 cm W x 50 cm D (12 in. x 20.5 in. x 20 in.) with enclosure, also 6U H rack mount
Communications Ports RS232 (COM1, COM2), IEEE-488.2
Operating Modes Gauge, absolute
Pressure Ranges Atmosphere to 100 MPa (15 000 psi)
Operating Media Nitrogen, air (others optional)
Drive Air Supply 500 to 800 kPa (75 to 120 psi)
Test Gas Supply                Greater than maximum pressure to be controlled by at least 5% of controller range, but not more than 15% greater than controller range, minimum 70% of controller range, ± 1 % stabillity. Flow adequate to maintain stable supply while slewing into test volume.
Pressure Connections   Drive air supply: 1/8 in. NPT F Test gas supply: DH500 (equivalent to AE F250C, HIP HF4) Test:  DH500
Utility Sensor Precision/Resolution ± 0.10 % span / 0.001 % span Drivers (8) 12V, 1 A max total output CE Conformance Available, must be specified

Pressure control

Control Modes

Dynamic (standard and high volume):  Sets target within hold limit and continuously adjusts pressure to remain at target value.

Static: Sets target within hold limit and stops control, allowing pressure to stabilize naturally.

Monotonic:  Sets pressure to target and maintains very slow ramp in same direction as pressure increment.

Ramp: Sets and maintains user specified rate of change of pressure.

Piston Gauge Control : Automates piston gauge pressure control.

Control Precision To ± 0.001 % of Q-RPT span (standard dynamic)
Control Volume 0 cm3 to 100 cm3, 50 cc optimum (operates in larger volumes but pressure stabilizing time increases)
Slew rate 60 sec. 0 to full scale, 50 cc volume
Dynamic mode Typical Time to Ready 200 seconds into 50 cm3 volume and 20% FS excursions with default hold limits (assuming no supply limitation).
Lowest Controllable Pressure 0.7 MPa (100 psi)

Measured and delivered pressure (Q-RPT)

Warm Up Time 30 minute temperature stabilization recommended from cold power up
Resolution To 1 ppm, user adjustable
Predicted One Year Stability2 ± 0.005 % of reading
Calibration A2LA accredited calibration report included
Q-RPTs A20M to A100M  

Precision1:  Greater of ± 0.012% of reading or 0.0036% of Q-RPT span5

Measurement Uncertainty3:  Greater of ±0.013 % of reading or 0.004% of Q-RPT span5 Delivered Pressure Uncertainty (Dynamic Mode):  Greater of ± 0.016% of reading or 0.005% of Q-RPT span5

Q-RPTs A7M to A14M


Standard Class
Greater of ± 0.008% of reading or 0.0024% of Q-RPT span5

Premium Class
Greater of ± 0.005% of reading, 0.0015% of AutoRanged span or 0.0005% of Q-RPT span6

Measurement Uncertainty3

Standard Class
Greater of ± 0.010% of reading or 0.0030% of Q-RPT span5

Premium Class
Greater of ± 0.008% of reading, 0.0024% of AutoRanged span or 0.0007% of Q-RPT span6

Delivered Pressure Uncertainty (Dynamic Mode)4

Standard Class
Greater of ± 0.014% of reading or 0.004% of Q-RPT span5

Premium Class
Greater of ± 0.013% of reading, 0.014% of AutoRanged span or 0.003% of Q-RPT span6

Q-RPTs A20M to A100M

Precision1 Greater of ± 0.012% of reading or 0.0036% of Q-RPT span5
Measurement Uncertainty3 Greater of ± 0.013 % of reading or 0.004% of Q-RPT span5
Delivered Pressure Uncertainty
(Dynamic Mode)
Greater of ± 0.016% of reading or 0.005% of Q-RPT span5
  1. Combined linearity, hysteresis and repeatability.
  2. Predicted Q-RPT measurement stability limit (k=2) over one year assuming regular use of AutoZero function. AutoZero occurs automatically in gauge mode whenever vented, by comparison with barometric reference in absolute mode. Absolute mode predicted one year stability without AutoZ is ± (0.005 % Q-RPT span + 0.005 % of reading).
  3. Maximum deviation of the Q-RPT indication from the true value of applied pressure including precision, predicted one year stability, temperature effect and calibration  ncertainty, combined and expanded (k=2) following the ISO "Guide to the Expression of Uncertainty in Measurement."
  4. Maximum deviation of the PPCH-G controlled pressure from the true value including measurement uncertainty and standard dynamic mode control hold limit.
  5. % of reading applies to 30 to 100 % of Q-RPT span. Under 30 % of Q-RPT span, uncertainty is a constant value obtained by multiplying the % of reading value by 30 % of Q-RPT span.
  6. % of reading value times measured pressure from 100 to 30 % of AutoRanged span. Under 30% of AutoRanged span, % of reading value times 30% of AutoRanged span. If AutoRanged span is less then 30% of maximum Q-RPT span, % of reading values times measured pressure, or % of reading times 9% of Q-RPT span, whichever is greater.


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