72.00 EURexcl. VAT · import VAT and duties on delivery
Key specifications
| Maximum working pressure | 1551000 |
|---|---|
| Sensing element | brass or bronze bellows |
| Switching element | one 140 ohm potentiometer |
631.80EUR
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Description
The Honeywell L91B1050/U is a pressure switch designed for use with steam, air, non-combustible gases, or liquids that do not corrode brass or bronze bellows. It features a sensing element made of brass or bronze bellows and a switching element consisting of one 140 ohm potentiometer. The maximum working pressure is 1551000 kPa. This device monitors pressure within a burner system and sends a signal to the burner control to allow or halt the ignition sequence based on pressure conditions.
Further details
| Application | confirms that the pressure or airflow is inside the permitted band and sends a signal to the burner control to allow the ignition sequence to continue |
|---|---|
| Function | safety device that monitors air or gas pressure within the burner system |
| Installation requirement | verify that the impulse line is clean and that the switch is correctly mounted in the orientation specified by the manufacturer |
| Mounting Feature | surface mountable through the back of the housing |
| Replacement criteria | key parameters are the medium (air or gas), the switching range and differential, the type of connection (thread or hose spigot), the contact rating, and the approval class required for the specific burner or boiler |
| Typical failures | torn diaphragm, blocked impulse tube, drifted setpoint |
Choosing and fitting
When selecting a replacement pressure switch of this type, key parameters include the medium (air or gas), switching range, differential, connection type (thread or hose spigot), contact rating, and approval class. The exact setpoint and differential must match the original to ensure safe operation and prevent nuisance lockouts. Verify the impulse line is clean and mount the switch in the orientation specified by the manufacturer.
Signs of failure
Typical failure modes include a torn diaphragm, a blocked impulse tube preventing accurate pressure sensing, or a drifted setpoint due to wear or contamination. These failures often present as repeated lockouts that appear to be ignition problems. After confirming spark and fuel supply are correct, suspect the pressure switch and check its operation.
All specifications
| Maximum working pressure | 1551000 |
|---|---|
| Sensing element | brass or bronze bellows |
| Switching element | one 140 ohm potentiometer |
Part numbers
| SKU | L91B1050/U |
|---|---|
| Additional article | 534.208.003 |
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