We ship to the Philippines — door-to-door, customs and logistics handled by 3G Electric

3G Electric
RFQ CartGet a QuoteSign inSign up
Image not available
SiemensSiemens Room Condition Monitors

Siemens Room Pressure Monitor: +/- 0.50" WC (125 Pa), P1, Terminal Block

The Siemens Room Pressure Monitor (SKU 878FG8, MPN 547-104B) is a room condition monitor with a measurement range of +/- 0.50" WC (125 Pa) and an accuracy of ±0.25% of Full Scale. It operates on 18 to 32V AC…

SKU 3G-OTH-176170

Brand
Siemens
Item
Room Pressure Monitor: +/- 0.50" WC
Category
Siemens Room Condition Monitors
Available to Order
Trade pricing by quote — replies within 24h
Qty
WhatsApp an engineer
No account needed — your quote request goes straight to our engineers. A free account lets you track quotes and re-order faster.
Worldwide Shipping
Air & sea freight
Datasheet on Request
Technical specs
1-Day Quote
Replies within 24h

Technical Specifications

Siemens
Manufacturer Part Number
547-104B
Type
P1, Terminal Block
Accuracy
±0.25% of Full Scale
Display Size
2.17 in
Analog Outputs
SPDT Relay
Measurement Range
+/- 0.50" WC (125 Pa)
Operating Voltage
18 to 32V AC
Operating Temperature Range
32°F to 120°F
Operating Humidity - Maximum
95% RH (Non-Condensing)
View Full Spec Sheet

Technical Documents

No technical documents available for this product.
Request documentation →
Not sure this is the right part? Get a recommendation.

Need installation or engineering help?

Installation, commissioning, maintenance plans, system design, and bundled product + service quotes — one team handles the full scope.
Talk to an engineer

Ask a question

Siemens Products
3G Electric (S) Pte. Ltd. — Singapore

Product Description

The Siemens Room Pressure Monitor (SKU 878FG8, MPN 547-104B) is a room condition monitor with a measurement range of +/- 0.50" WC (125 Pa) and an accuracy of ±0.25% of Full Scale. It operates on 18 to 32V AC, features a 2.17 in display, and provides an SPDT Relay analog output. Designed for environments with temperatures from 32°F to 120°F and up to 95% RH (non-condensing), this device monitors room pressure conditions.

Supplied to the Philippines — compatible with 60 Hz installations. DHL Express delivery to Manila, Quezon City, Cebu, customs and duties handled door-to-door.

Frequently Asked Questions

What is the Siemens Room Pressure Monitor 547-104B used for?

The Siemens Room Pressure Monitor 547-104B measures differential room pressure in cleanrooms, labs, and hospitals. It provides a local display and SPDT relay output for alarm or control, ensuring pressure differentials stay within ±0.50" WC (125 Pa) with ±0.25% of Full Scale accuracy.

What are the specifications of the Siemens 547-104B room pressure monitor?

The Siemens 547-104B has a measurement range of ±0.50" WC (125 Pa), accuracy ±0.25% of Full Scale, SPDT relay output, 2.17 in display, and operates on 18 to 32V AC. It works from 32°F to 120°F and up to 95% RH non-condensing.

Where to buy Siemens 547-104B room pressure monitor worldwide?

3G Electric supplies the Siemens 547-104B room pressure monitor worldwide. We handle full logistics, customs clearance, and delivery to your site. Contact us for availability and lead time; we source genuine Siemens equipment for global industrial applications.

How to install the Siemens 547-104B room pressure monitor?

Mount the Siemens 547-104B on a stable wall near the controlled space. Connect the terminal block to 18 to 32V AC power and wire the SPDT relay for alarm or control. Ensure the pressure ports are correctly plumbed and the unit is level for accurate ±0.25% FS readings.

Used in

Common applications for Siemens
District cooling plants — LME73 + RWF55 for condenser-water modulation
Inflight catering and food-processing steam boilers — LMG22 with SQN90 air-fuel cross-damper
Hospital steam-plant redundancy — LME41 with QRA2 UV flame detection for dual-fuel boilers
Semiconductor fab process heat — LME23 and SKP55 gas valves on hot-oil heater skids
Container-terminal reefer-deck heating — LMG22 retrofit onto legacy burner racks

Siemens Products

3G Electric supplies Siemens siemens room condition monitors. We supply genuine products with in-stock availability on common SKUs, technical documentation, commissioning support, and warranty service — worldwide.

You might also need

Burners & Combustion →Pumps & Compressors →Spare Parts →All Products →

Similar products

Matched by specification & description
Siemens
Siemens
SIEMENS Room Pressure Monitor: +/- 0.25" WC (62.5 Pa), P1, Terminal Block, 2.17 in Display Size (MPN 547-103B). Key specifications — Manufacturer Part Number: 547-103B; Brand: SIEMENS; Accuracy: ±0.25% of Full Scale; Analog Outputs: SPDT Relay; Display Size: 2.17 in; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95% RH (Non-Condensing); Operating Temperature Range: 32°F to 120°F.
Temperature and Humidity Sensor: Wall Mount, 32°F to 131°F, Polycarbonate, Single Measurement (MPN QFA3212.EWSN). Key specifications — Humidity Output: 4 to 20 mA; Includes: Anchors; Relative Humidity Accuracy: ±2% of Full Scale; Compatible Building Automation Protocols: BACnet MS/TP; For Use With Building Automation Systems: Building Automation System Compatible; Relative Humidity Range: 0 to 100%; Product Type: Room Temperature and Humidity Sensor; Brand: SIEMENS.
Siemens
Temperature and Humidity Sensor: Wall Mount, 32°F to 131°F, Polycarbonate, Single Measurement (MPN QFA3212.EWSN). Key specifications — Humidity Output: 4 to 20 mA; Includes: Anchors; Relative Humidity Accuracy: ±2% of Full Scale; Compatible Building Automation Protocols: BACnet MS/TP; For Use With Building Automation Systems: Building Automation System Compatible; Relative Humidity Range: 0 to 100%; Product Type: Room Temperature and Humidity Sensor; Brand: SIEMENS.
Temperature and Humidity Sensor: Wall Mount, Digital, 55°F to 95°F, Polycarbonate, Plastic (MPN QFA3230.FWSN). Key specifications — Humidity Output: 4 to 20 mA; Includes: Matching Gaskets; Relative Humidity Accuracy: ±2% of Full Scale; Compatible Building Automation Protocols: BACnet MS/TP; For Use With Building Automation Systems: Building Automation System Compatible; Relative Humidity Range: 0 to 100%; Product Type: Room Temperature and Humidity Sensor; Brand: SIEMENS.
Siemens
Temperature and Humidity Sensor: Wall Mount, Digital, 55°F to 95°F, Polycarbonate, Plastic (MPN QFA3230.FWSN). Key specifications — Humidity Output: 4 to 20 mA; Includes: Matching Gaskets; Relative Humidity Accuracy: ±2% of Full Scale; Compatible Building Automation Protocols: BACnet MS/TP; For Use With Building Automation Systems: Building Automation System Compatible; Relative Humidity Range: 0 to 100%; Product Type: Room Temperature and Humidity Sensor; Brand: SIEMENS.
Temperature and Humidity Sensor: Wall Mount, Digital, 32°F to 122°F, Polycarbonate, Plastic (MPN QFA32SS.FWSN). Key specifications — Humidity Output: 0 to 5V DC; Includes: Trim Rings; Relative Humidity Accuracy: ±2% of Full Scale; Compatible Building Automation Protocols: Modbus; For Use With Building Automation Systems: Building Automation System Compatible; Relative Humidity Range: 0 to 100%; Product Type: Room Temperature and Humidity Sensor; Brand: SIEMENS.
Siemens
Temperature and Humidity Sensor: Wall Mount, Digital, 32°F to 122°F, Polycarbonate, Plastic (MPN QFA32SS.FWSN). Key specifications — Humidity Output: 0 to 5V DC; Includes: Trim Rings; Relative Humidity Accuracy: ±2% of Full Scale; Compatible Building Automation Protocols: Modbus; For Use With Building Automation Systems: Building Automation System Compatible; Relative Humidity Range: 0 to 100%; Product Type: Room Temperature and Humidity Sensor; Brand: SIEMENS.
Siemens
Siemens
Differential Pressure Sensor: 1 in wc to 1 in wc, ±0.40% Accuracy, 0 to 10V DC, 4 to 20mA, 100 ohms (MPN 590-780). Key specifications — Accuracy: ±0.40%; Output: 4 to 20mA; Loop Resistance: 100 ohms; Power Required: 0 to 10V DC; Brand: SIEMENS.

More from Siemens

View all Siemens parts →
Siemens
Siemens
SIEMENS Room Pressure Monitor: +/- 0.25" WC (62.5 Pa), BACnet, Terminal Block, 2.17 in Display Size (MPN 547-203A). Key specifications — Manufacturer Part Number: 547-203A; Brand: SIEMENS; Accuracy: ±0.5% of Full Scale; Analog Outputs: SPDT Relay; Display Size: 2.17 in; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95% RH (Non-Condensing); Operating Temperature Range: 32°F to 120°F.
Siemens
Siemens
SIEMENS Room Pressure Monitor: +/- 0.25" WC (62.5 Pa), P1, Terminal Block, 2.17 in Display Size (MPN 547-313B). Key specifications — Manufacturer Part Number: 547-313B; Brand: SIEMENS; Accuracy: ±0.25% of Full Scale; Analog Inputs: 0 to 5 V DC; Analog Outputs: 0 to 5V DC (3-Wire); Display Size: 2.17 in; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95% RH (Non-Condensing).
Siemens
Siemens
SIEMENS Room Pressure Monitor: +/- 0.25" WC (62.5 Pa), BACnet, Terminal Block, 2.17 in Display Size (MPN 547-323B). Key specifications — Manufacturer Part Number: 547-323B; Brand: SIEMENS; Accuracy: ±0.25% of Full Scale; Analog Inputs: 0 to 10 V DC; Analog Outputs: 0 to 10V DC (3-Wire); Display Size: 2.17 in; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95% RH (Non-Condensing).
Siemens
Siemens
SIEMENS Room Pressure Monitor: +/- 0.25" WC (62.5 Pa), BACnet, Terminal Block, 2.17 in Display Size (MPN 547-203B). Key specifications — Manufacturer Part Number: 547-203B; Brand: SIEMENS; Accuracy: ±0.25% of Full Scale; Analog Outputs: 4 to 20 mA (2-Wire); Display Size: 2.17 in; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95% RH (Non-Condensing); Operating Temperature Range: 32°F to 120°F.
SIEMENS Room Condition Monitor: +/- 0.25" WC (62.5 Pa), BACnet/P1, Terminal Block, 547-323A. Key specifications — Manufacturer Part Number: 547-323A; Brand: SIEMENS; Accuracy: 0.5%; Analog Inputs: 4 to 20 mA Loop; Display Size: 4.3 in; Includes: Mating Electrical Connectors; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95%.
Siemens
SIEMENS Room Condition Monitor: +/- 0.25" WC (62.5 Pa), BACnet/P1, Terminal Block, 547-323A. Key specifications — Manufacturer Part Number: 547-323A; Brand: SIEMENS; Accuracy: 0.5%; Analog Inputs: 4 to 20 mA Loop; Display Size: 4.3 in; Includes: Mating Electrical Connectors; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95%.
Siemens
Siemens
SIEMENS Room Pressure Monitor: +/- 0.25" WC (62.5 Pa), P1, Terminal Block, 2.17 in Display Size (MPN 547-103A). Key specifications — Manufacturer Part Number: 547-103A; Brand: SIEMENS; Accuracy: ±0.5% of Full Scale; Analog Outputs: SPDT Relay; Display Size: 2.17 in; Measurement Range: +/- 0.25" WC (62.5 Pa); Operating Humidity - Maximum: 95% RH (Non-Condensing); Operating Temperature Range: 32°F to 120°F.
SIEMENS Room Condition Monitor: +/- 0.10" WC (25 Pa), BACnet/P1, Terminal Block, 4.3 in Display Size (MPN 547-322B). Key specifications — Manufacturer Part Number: 547-322B; Brand: SIEMENS; Accuracy: 0.25%; Analog Inputs: 0 to 5 V DC; Display Size: 4.3 in; Includes: Phoenix Contact MC Plug Kit with (3) Green and (2) Black Connectors; Measurement Range: +/- 0.10" WC (25 Pa); Operating Humidity - Maximum: 95%.
Siemens
SIEMENS Room Condition Monitor: +/- 0.10" WC (25 Pa), BACnet/P1, Terminal Block, 4.3 in Display Size (MPN 547-322B). Key specifications — Manufacturer Part Number: 547-322B; Brand: SIEMENS; Accuracy: 0.25%; Analog Inputs: 0 to 5 V DC; Display Size: 4.3 in; Includes: Phoenix Contact MC Plug Kit with (3) Green and (2) Black Connectors; Measurement Range: +/- 0.10" WC (25 Pa); Operating Humidity - Maximum: 95%.
Siemens
Siemens
SIEMENS Room Pressure Monitor: +/- 0.10" WC (25 Pa), P1, Terminal Block, 2.17 in Display Size (MPN 547-312A). Key specifications — Manufacturer Part Number: 547-312A; Brand: SIEMENS; Accuracy: ±0.5% of Full Scale; Analog Inputs: 0 to 5 V DC; Analog Outputs: 4 to 20 mA (2-Wire); Display Size: 2.17 in; Measurement Range: +/- 0.10" WC (25 Pa); Operating Humidity - Maximum: 95% RH (Non-Condensing).