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The Palmer Wahl 524 differential pressure chart recorder produces a paper record for reviewing filter pressure drop and suitable flow or liquid-level measurement systems. Optional pens allow static pressure and temperature to be recorded alongside differential pressure.
Keep a visible paper history of process conditions with the Palmer Wahl Model 524 differential pressure chart recorder. Operators can review the trace at the instrument and retain completed charts with operating or maintenance records.
The recorder measures the pressure difference between two connected points. Depending on the selected configuration, additional pens record static pressure and temperature on the same chart, making it easier to compare changes over the recording period.
| Application | How to specify the measurement |
|---|---|
| Filter pressure-drop monitoring | Provide the differential pressure across a clean filter, the highest pressure drop to be recorded and the normal line pressure. |
| Orifice flow measurement | Provide the orifice and pipe details, process medium and operating conditions. Flow is calculated from differential pressure using the appropriate measurement arrangement; the recorder alone is not a complete flowmeter. |
| Liquid-level measurement | Specify the vessel arrangement, liquid density and required level span so the pressure connections and differential-pressure range can be assessed. |
| Process trend recording | Identify which variables must appear together: differential pressure, static pressure and temperature. Match the chart scales and recording period to the task. |
| Configuration | Measurements recorded |
|---|---|
| One pen | Differential pressure. |
| Two pens | Differential pressure with either static pressure or temperature. |
| Three pens | Differential pressure, static pressure and temperature. |
Select the required channels when ordering. For an existing recorder, provide its identification details before requesting a change to the pen or measurement configuration.
| Specification | Details |
|---|---|
| Chart diameter | 12 inches. |
| Chart arc line | 9-7/16 inches. |
| Differential-pressure range options | 0–20, 0–50, 0–100, 0–200, 0–300 and 0–400 inches of water. |
| DP accuracy | ±1.0% of full scale. |
| DP safe working pressure | Maximum 2,500 psi, approximately 172 bar. |
| DP actuator temperature limit | -40 to +82°C. |
| Differential-pressure element | 316L stainless steel dual bellows. |
| Case and mounting | Die-cast aluminium case; pipestand mounting. |
| Standard chart drive | PC-11 battery-operated drive with 11 selectable recording intervals. |
| Alternative chart drive | PC-12 battery-operated drive; specify the required recording period. |
Pressure selection: The optional static-pressure element has its own measurement range. Selecting a higher-range static-pressure pen does not increase the differential-pressure unit’s 2,500 psi maximum safe working pressure.
Static-pressure elements are offered in selected psi ranges up to 30,000 psi, or selected bar ranges up to 600 bar. These are separate catalogue range options, not equivalent unit conversions. Specify the required scale and connection arrangement.
Temperature recording uses a mercury-free bulb and capillary system. Selected Celsius ranges extend to 300°C, with the available range depending on the fill system. The standard capillary length is 10 feet; provide the required bulb location and routing distance when requesting a quotation.
For temperature measurements, include the process connection, insertion length and any thermowell requirement. For static pressure, include normal pressure, maximum pressure and expected pressure surges.
The sensing mechanism operates mechanically, while the battery-operated drive rotates the chart. Choose the recording period according to how often operators inspect the instrument and replace the paper.
The PC-11 provides recording intervals from 60 minutes to 32 days. A PC-12 drive offers alternative intervals for applications requiring different chart rotation periods. Confirm the exact interval when ordering, and use chart paper printed for that rotation time.
Palmer Wahl Model 524 differential pressure recorder reference information.
Model 524 technical reference. Confirm the selected ranges, chart drive and accessories when ordering.
The Model 524 differential recorder uses AR-3713 series pens. The table below shows the manufacturer’s standard three-pen arrangement. Confirm the installed pen position and configuration before ordering replacements.
| Part number | Colour | Standard function and position |
|---|---|---|
| AR-3713-02-6 | Red | Differential pressure — top pen. |
| AR-3713-03-6 | Blue | Static pressure — middle pen. |
| AR-3713-04-6 | Black | Alternative static-pressure colour — middle pen. |
| AR-3713-01-6 | Green | Temperature — bottom pen. |
Chart paper: Specify the 12-inch diameter, 9-7/16-inch arc line, rotation period and all printed measurement scales. Send the existing chart number or a clear photograph to help identify the correct replacement.
Five-valve manifold: The optional AWR-3691-01 manifold kit is ordered separately. Confirm its suitability and connection requirements for the installation.
Contact us for pricing and availability. Please provide:
If you require pressure and temperature recording without a differential-pressure channel, view the Palmer Wahl 8-inch and 12-inch pressure and temperature chart recorders.
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The Palmer Wahl 524 differential pressure chart recorder produces a paper record for reviewing filter pressure drop and suitable flow or liquid-level measurement systems. Optional pens allow static pressure and temperature to be recorded alongside differential pressure.
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