Part code 064G6655 corresponds to a Danfoss MBS 1900 series pressure transmitter (transducer). This specific product line is commonly used in industrial and HVAC/R air or water applications, such as booster pumps and air compressors. 

Technical Specifications  

• Pressure Range: 0 to 250 psi (0 to 17.24 bar).
• Output Signal: 4 – 20 mA (current signal).
• Pressure Connection: 1/4-18 NPT.
• Electrical Connection: Metri-Pack 150 series round connector.
• Material: Wetted parts are stainless steel (AISI 304), and the enclosure is stainless steel (AISI 316L).
• Temperature Range: Typically rated for media temperatures from 0 to 80 °C (32 to 176 °F). 

Wiring and Installation

The labeling on the sensor body indicates the following pin configuration:

• Pin 2: Positive supply (+).
• Pin 3: Negative/common (-).

The supply voltage for these units typically ranges from 9 to 28 V DC. When installing, ensure the blue thread sealant seen in the image is intact or replaced to maintain a leak-proof connection to the system. 

Danfoss Pressure transmitter MBS 1900 is designed for use in air and water applications The Danfoss pressure transmitter MBS 1900 is designed for use in air and water applications like Booster Pumps and Air Compressors. The flexible pressure transmitter programme covers different output signals, absolute and gauge (relative) versions, measuring ranges from 0-4 bar to 0-25 bar and a wide range of pressure and electrical connections. Enclosure material is stainless steel AISI 316L. • Designed for use in air and water applications • Wetted parts of stainless steel (AISI 304) • Pressure ranges in relative (gauge) or absolute from 0 up to 25 bar • Output signals: 4 - 20 mA, or ratio metric • Absolute or relative (gauge) sensor element • A wide range of pressure and electrical connections • Digitally compensated • RoHS conformity Code number selector Code no.        Type        Pr. Reference   Pr. range       Output sign  Voltage         El.connection               Pr. connection 064G6501 MBS 1900 Gauge (relative) 0 - 6 bar         4 - 20 mA   9 - 28Vdc     EN175301-803               G1/4 A EN837 064G6502 MBS 1900 Gauge (relative) 0 - 10 bar       4 - 20 mA   9 - 28Vdc     EN175301-803               G1/4 A EN837 064G6504 MBS 1900 Gauge (relative) 0 - 25 bar       4 - 20 mA   9 - 28Vdc     EN175301-803               G1/4 A EN837 064G6510 MBS 1900 Gauge (relative) 0 - 250 psiG  4 - 20 mA   9 - 28Vdc     EN175301-803                1/4-18 NPT 064G6511 MBS 1900 Gauge (relative) 0 - 16 bar       4 - 20 mA   9 - 28Vdc    EN175301-803                G1/4 DIN3852-E 064G6514 MBS 1900 Gauge (relative) 0 - 100 psiG  4 - 20 mA   9 - 28Vdc     EN175301-803                1/4-18 NPT 064G6515 MBS 1900 Gauge (relative) 0 - 200 psiG  4 - 20 mA   9 - 28Vdc     EN175301-803                1/4-18 NPT 064G6516 MBS 1900 Gauge (relative) 0 - 300 psiG  4 - 20 mA   9 - 28Vdc     EN175301-803                1/4-18 NPT 064G6523 MBS 1900 Gauge (relative) 0 - 16 bar       4 - 20 mA   9 - 28Vdc     EN175301-803 (1)         G1/4 A EN837 064G6528 MBS 1900 Gauge (relative) 0 - 250 psiG  4 - 20 mA   9 - 28Vdc     Round Packard conn.  1/4-18 NPT 064G6529 MBS 1900 Gauge (relative) 0 - 250 psiG 10 - 90%  V4.5 - 5.5Vdc Round Packard conn.  1/4-18 NPT 064G6530 MBS 1900 Gauge (relative) 0 - 250 psiG  4 - 20 mA   9 - 28Vdc     EN175301-803 (1)          1/4-18 NPT 064G6532 MBS 1900 Gauge (relative) 0 - 16 bar    10 - 90% V4.5 - 5.5Vdc Round Packard conn.    G1/4 DIN3852-E 064G6533 MBS 1900 Gauge (relative) 0 - 16 bar      4 - 20 mA   9 - 28Vdc  Round Packard conn.     G1/4 DIN3852-E 064G6534 MBS 1900 Gauge (relative) 0 - 100 psiG  4 - 20 mA   9 - 28Vdc    EN175301-803 (1)           1/4-18 NPT 064G6535 MBS 1900 Gauge (relative) 0 - 200 psiG  4 - 20 mA   9 - 28Vdc    EN175301-803 (1)           1/4-18 NPT 064G6536 MBS 1900 Gauge (relative) 0 - 300 psiG  4 - 20 mA   9 - 28Vdc    EN175301-803 (1)           1/4-18 NPT 064G6542 MBS 1900 Gauge (relative) 0 - 16 bar       4 - 20 mA   9 - 28Vdc    EN175301-803 (1)          R 1/4 ISO 7-1 064G6543 MBS 1900 Gauge (relative) 0 - 10 bar       4 - 20 mA   9 - 28Vdc    EN175301-803 (1)          R 1/4 ISO 7-1 064G6545 MBS 1900 Gauge (relative) 0 - 10 bar       4 - 20 mA   9 - 28Vdc    EN175301-803 (1)           1/4-18 NPT 064G6550 MBS 1900     Absolute          0 - 16 bar       4 - 20 mA   9 - 28Vdc    Round Packard conn.     1/4-18 NPT 064G6555 MBS 1900 Gauge (relative) 0 - 25 bar       4 - 20 mA   9 - 28Vdc    Round Packard conn.     1/4-18 NPT 064G6556 MBS 1900 Gauge (relative) 0 - 100 psi     4 - 20 mA   9 - 28Vdc    Round Packard conn.     1/4-18 NPT 064G6557 MBS 1900 Gauge (relative) 0 - 200 psiG 10 - 90%  V4.5 - 5.5Vdc  Round Packard conn.   1/4-18 NPT 064G6560 MBS 1900 Gauge (relative) 0 - 100 psiG  4 - 20 mA   9 - 28Vdc    Round Packard conn.     1/2-14 NPT 064G6567 MBS 1900 Gauge (relative) 0 - 16 bar       4 - 20 mA   9 - 28Vdc    EN175301-803 (1)           1/4-18 NPT 064G6568 MBS 1900 Gauge (relative) 0 - 300 psiG  4 - 20 mA   9 - 28Vdc    Round Packard conn.     1/4-18 NPT 064G6588 MBS 1900 Gauge (relative) 0 - 200 psiG  4 - 20 mA   9 - 28Vdc    EN175301-803 (1)           1/2-14 NP