© Danfoss | DCS (im) | 2017.07
6 | 520B7682 | IC.PI.P20.C7.02
Danfoss pressure transmitters type MBS 4201, MBS 4251, MBS 4701 and MBS 4751 are maintenance free.
Zero point and span (measurement area) adjustment is possible on MBS 4701 and MBS 4751.
Adjustment procedure (see drawing):
Loosen screw at top of the DIN 43650 plug. Remove plug.
Unscrew the black milled nut from the pressure transmitter and remove the DIN 43650 insert from the transmitter.
Install the plug on the DIN 43650 insert and connect the current measuring instrument.
Adjust the zero point on the potentiometer below the hole marked ZERO.
Adjust the span (measuring range) on the potentiometer below the hole marked SPAN (precise pressure reference must be used).
Do not remove the silicone during adjustment. Be sure that the potentiometer is covered with silicone after adjustment
Maintenance/Adjustment
Cables must be specified for a minimum test voltage of 500 VAC between conductor/earth, conductor/screen and screen/earth.
In addition, the total capacity and inductivity of the installation (trans cable) must be taken into consideration.
In Zone 0 an intrinsically safe type Ex ia circuit must be used and national regulations for Zone 0 must be complied with. The pressure
transmitter must only be used in Zone 0 at atmospheric pressure between 0.8 and 1.1 bar and at ambient temperatures
between -20 and 50 °C.
Electrical connection
DIN 43650
+
-
Pin 1
Pin 2
DIN 72585
+
-
Pin 1
Pin 2
PVC cable
+
-
Black 1
Black 2
ETFE cable
+
-
Black
Blue
MBS4201
MBS4251
MBS4701
MBS4751
Zero adjustment
0 – 1 to 0 – 10 bar
-5 – 20% FS
0 – 16 to 0 – 40 bar
-5 – 10% FS
0 – 60 to 0 – 600 bar
-2.5 – 2.5 FS
Span adjustment
-5 – 5% FS
See table