Vermes MDS 358X user Manual.pdf - 第87页
Operation 76 VTK - TR -BA- 072e - 1 - User Manua l MDS 358X S eries 7.13 Dispensing wi th a Heater The Microd ispe nsing Sys tem MDS 3 58X can opti onally be equi pped with a nozzle h eater . One opti on is t he MDH - 48…
Operation
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7.12 Adjust Offset
If you have a problem with leakage despite a correct adjust (see paragraph 6.5, page 57), you can
use service code 33 to add a little adjust offset. This adjust offset will make sure the valve is
accordingly tighter than indicated by the display value. E.g. with an adjust offset of 4, the adjust
still works between 0 % and 3 %, but the valve is tighter at this value than it would be without
the adjust offset.
To enter a service code, go to “Main Menu -> Service-Option -> Service Code” (see also the figure
below and paragraph 4.5.6, page 37), press [enter] and enter 33. Once you have confirmed the
service code with [enter], you reach a new submenu called “Adjust Offset”. There you can enter a
value between -5 and 5 (negative means tighter than normal, positive looser than normal).
Confirm your value with [enter]. If you set an adjust offset of 0, the adjust offset is deactivated. It
is advisable to test the system first with an adjust offset value near the default value of 0, e.g. -1
Fig. 55: Submenu Service-Option
Alternatively, you can use the serial command ADJUST:OFFSET:<value>, to set an adjust offset
(see paragraph 8.1.2.2, page 88). The range is the same as if you set it via the keypad. You can also
use the command ADJUST:OFFSET:? to check for an existing adjust offset.
It is important to know that this adjust offset value is only saved in the valve. You have to enter it
again, if you change the valve. But as long as you use the same valve, you can switch off the
control unit and the adjust offset value is kept.
Operation
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VTK-TR-BA-072e-1 - User Manual MDS 358X Series
7.13 Dispensing with a Heater
The Microdispensing System MDS 358X can optionally be equipped with a nozzle heater. One
option is the MDH-48-BY (see Fig. 56). If a heater is connected to the system, the main menu
shows the current temperature (in °C) instead of “Ready”. More detailed information about the
menu, while using a heater, you can find in paragraph 7.13.1, page 77 and paragraph 4.5.3.2,
page 31.
Fig. 56: MDH-48-BY
CAUTION
High temperatures, danger of burns
The nozzle heater can reach very high temperatures (e.g. of up to 180 °C with MDH-48-BY). Do
not touch this area during operation. Afterwards only touch it once it has cooled down.
With a heater, you can control the dynamical viscosity of the fluid to be dispensed. For some
liquids, dispensing without heating is impossible. Heating may also be required to ensure a
constant process temperature, or when the dispensing has to take place above room
temperature.
Information how to mount a heater you can find in paragraph 6.2, page 45. You then need the
heater cable 48 V, to connect the heater to the MDC (see paragraph 6.3.3.4, page 53).
INFORMATION
Adjust deactivates heater
If you perform an adjust while the heater is activated, the heater is deactivated automatically.
You have to switch the heater ON again after the adjust, if you need it in your application.
Operation
VTK-TR-BA-072e-1 - User Manual MDS 358X Series
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7.13.1 Heater and MDC
You can activate the heater via the heater submenu in the MDC menu (see picture below). Use
the [enter] and arrow keys to navigate down to the submenu “Heater” in the menu
“Cooler/Heater”. Here you can switch ON the heater (menu item “Heater ON/OFF”) and set the
temperature (menu item “Heater Temp.”). The possible temperature range depends on the
connected heater (e.g. for MDH-48-BY it lies between 10 °C and 180 °C). (Further information
about the menu of the control unit you can find in paragraph 4.5, page 27.)
Fig. 57: Submenu Heater
INFORMATION
Control heater via serial commands
The heater can also be controlled via the serial interface. The relevant commands and
information can be found in paragraph 8.1.2.2, page 88.
7.13.2 Calibration of the Heater
You should calibrate the temperature settings of your heater in regular intervals. We recommend
to do the calibration once a year. VERMES Microdispensing offers a calibrator set (Calibrator set
for MFC 3000, order no. 1015434, see Fig. 58). The set contains two calibrators for different
temperatures:
Calibrator MFC3000 – 20°C (blue, as single product order no. 1015437)
Calibrator MFC3000 – 200°C (red, as single product order no. 1015436)
Fig. 58: Calibrator Set