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| 7250LP Low Pressure Controller/Calibrator |
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The Model 7250LP Low Pressure Digital Pressure Calibrator, part of the versatile Series 7250 family, is specifically designed to meet the demanding performance requirements of calibrating low pressure sensors, transducers, mechanical gauges, portable calibrators and their plug-in modules. To accommodate bi-directional devices, the 7250LP can be supplied to operate in both positive and negative gauge modes.
Available in three different range combinations with two ranges in a single instrument:
- 10 inH2O and 30 inH2O(25 and 75mbar)
- 20 inH2O and 60 inH2O(50 and 150mbar)
- 35inH2O and 100 inH2O(87 and 250mbar)
The 7250LP provides a precision of 0.005% of reading from 10% to 100% of the maximum range. For example, the 10/30 inH2O 7250LP provides a precision of 0.005% of reading when measuring pressure from 30 to 3in H2O(75 to 7.5mbar). Changing ranges is automatic both upscale and downscale and does not require operator intervention. Since the 7250LP utilizes a true differential sensor, the reference port can be connected to the test system eliminating unwanted pressure disturbances due to room drafts caused by HVAC systems.
- Precision: 0.005% of reading
- Control stability: 0.004% of each range
- Resolution to 0.0001 inH2O
- Time to setpoint: <30 seconds with no overshoot
- One year calibration interval
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Pressure Ranges |
| Model 7250LP |
Select from three range combinations: 10 in H2O and 30 in H2O or 20 in H2O and 60 in H2O or 35 in H2O and 100 in H2O |
| Optional Modes |
Vacuum (negative gauge)
Other Series 7250 digital pressure controllers are available in a variety of ranges from 5 to 3000 psig (350 mbar to 207 bar). |
Performance |
| Precision |
0.005% of reading from 10% FS to 100% FS. Fixed error of 0.005% of 10% FS from 0% to 10% FS
Precision is defined as the combined effects of linearity, repeatability and hysteresis throughout the operating temperature range.
Expression of accuracy (uncertainty) conforms with the recommendations of the ISO guide to the expression of uncertainty in measurement. |
| Stability |
0.0075% of reading, per year |
| Control Stability |
Active mode: 0.004% of each range Passive mode: no additional uncertainty |
| Display Resolution |
User selectable to 1:1,000,000 |
| Control Response |
Optimized for 5 in3 load volume (included with 7250LP)
Maximum 30 in3 load volume |
| Negative Gauge Precision (optional) |
7250LP: 0.005% of reading from 10% to 100% of FS |
Total Uncertainty |
| Maximum deviation from the true value of pressure including precision, stability, temperature effects and the calibration standard |
10 in H2O range/30 in H2O range
0.009% of reading or 0.00015 in H2O
20 in H2O range/60 in H2O range
0.009% of reading or 0.0003 in H2O
35 in H2O range/100 in H2O range
0.009% of reading or 0.0005 in H2O |
General |
| Display |
TFT, VGA, active matrix, 6.4 in (163 mm) 640 x 480 resolution, 65,000 colors |
| Temperature |
Operating: 64°F to 97°F (18°C to 36°C)
Storage: -4°F to 158°F (-20°C to 70°C) |
| Humidity |
5% to 95% relative humidity, non-condensing |
| Dimensions |
(h x w x d) All versions: 7 in x 16.5 in x 19 in (178 mm x 419 mm x 483 mm) |
| Weight |
Model 7250/7250i: 17 lb (7.7 kg)
Model 7250xi: 20 lb (9 kg) |
| Test Port and Supply Connection |
1/4 in NPT female |
| Warm Up Time |
2 to 3 hours; may be left on indefinitely |
| Pressure Medium |
Nitrogen or clean dry air |
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