
dkc3127a0600p_01 - 11/20
3.4 SPECIAL CONDITIONS OF SAFE USE
Before turning on the device, make sure the installation is complete, and there are no visible
defects. The device may only be used within the limitations specified in the technical
specifications.
Protection against electrostatic charge:
The devices may partially contain static charging capable plastic components. The presence
of electrostatic charges may cause a risk of spark generation and ignition and therefore
electrostatic charges must be completely prevented:
-Use a shielded cable!
-Avoid friction on plastic surfaces!
-Do not clean the device dry! For example, use a wet duster!
Ex ia certified transmitters may only be operated in qualified, certified and approved
galvanically isolated intrinsically safe Ex ia circuits complying with the technical data and the
device’s explosion protection marking. The metal housing of the device must be connected
to the EP (equipotential) network!
4. INSTALLATION
Due to its small size and weight NIPRESS DK-300, DK-400, DK-800 can be mounted
directly on tanks, pipelines, machines, etc. without support assembly.
To provide a chance for replacement of the instrument during operation the use of closing
armature is recommended. A simple ball valve will be suitable for lower pressure, but for
higher pressure (above 6 bar) a three-way blow-off needle-valve is suggested.
Remove the packaging and protective cap directly before starting assembly to avoid
damaging the diaphragm.
In the case of level measurement, it is advisable to screw the transmitter into the stump on
the side of the tank.
The display and the plastic housing are equipped with a rotation limiter. Do not rotate the
display beyond the rotation limits.
4.1 INSTALLATION INSTRUCTION
Depending on the medium measured, the medium may cause a hazard to the installer, so
wear suitable protective clothing, gloves, and goggles.
In the case of mounting and dismounting, only the designed surface can be used for torque
transmission (wrench) on the device.
Be careful because the front membrane is vulnerable!
The cylindrical housing of the transmitter should not be gripped and tightened with a
pipe wrench!
Due to electronic noise protection, the pressure switch housing is grounded. If the grounding
of the technology is correct, the pressure switch does not require a separate grounding.
Otherwise, the ground must be connected to the connector and grounded at the other end of
the cable.
Install the device only in depressurized and currentless state!
Mounting position: The pressure switch has been calibrated in a vertical position when the
diaphragm is oriented downwards. If it is differently mounted, a tiny deviation can appear at
the output in the measured values.
For oxygen applications (only DK-800) transmitters are recommended with O-rings of FKM
Vi 567: permissible maximum values: 25 bar / 150° C (BAM approval), over 25 bar pressure
transmitter can be used without seals.
Tightening torques:
1/4" BSP: max. 5 Nm; Tightening torque for pressure switch with
1/2" BSP: max. 10 Nm; plastic process connection: max. 3 Nm.
3/4" BSP: max. 15 Nm; 1/4" NPT: max. 30 Nm;
1" BSP: max. 20 Nm; 1/2" NPT: max. 70 Nm.
1 1/2" BSP: max. 25 Nm;
The specified tightening torques must not be exceeded!
Do not use a pipe wrench, because its use can cause damage to the device!
Installation steps for BSP process connection (DIN 3852)
Do not use any additional sealing material such as teflon tape!
Check if the O-ring is undamaged, it has a flawless and clean surface and seated in the
designated groove.
Screw the device into the corresponding thread by hand, and tighten the parts with a suitable
torque wrench. If your device can be secured with a knurled ring, the pressure transmitter
should only be tightened by hand!
Installation steps for NPT process connection:
Use a suitable seal (e. g. a PTFE-strip)! Screw the device into the corresponding thread by
hand, and tighten it with a wrench!
Installation steps for hygienic connections (only DK-400, DL-400)
Centre the dairy pipe connection in the counterpart! Screw the cup nut onto the mounting
part! Tighten it with a hook wrench!
Installation steps for "TRICLAMP and VARIVENT" connections (only DK-400, DL-400)
Use a suitable seal corresponding to the medium and the pressure input! Place the seal onto
the corresponding mounting part! Centre the Clamp or Varivent connection on the fitting
counterpart with seal! Then fit the device with a suitable fastening element (e. g. half-ring or
retractable ring clamp) according to the supplier’s instructions.