DM-II Drying Monitor What is the DM-II Drying Monitor? The DM-II Drying Monitor is a patented instrument that is integrated into your dehumidifying drying system. The DM-II monitors the drying process as it occurs within the drying hopper. The DM-II can be programmed to alert the operator if the drying process deviates from a pre-determined and programmed range of drying parameters established by the operator.
H o w t h e D M - I I Wo r k s Red - The dryer has stopped/shut down alarm on the dryer Amber - possible trouble/ DM-II passive alarm Green - running properly The DM-II monitors the vertical temperature profile of the material in the drying hopper. The DM-II's six temperature sensors are located within the DM-II's temperature probe that has been / or will be installed in your drying hopper.
Unpacking the Boxes The DM-II comes in two or more shipping containers, depending on the options ordered. The containers should include: DM-II Probe Compression fitting Coupling Adapter plates and gasket Probe cable 1 Carefully remove the components from their shipping containers. 2 Remove all packing material, protective paper, tape, and plastic. Do not discard installation notice tags.
Specifications: DM-II Probe Drying Hopper # Conair Part # CH/RW 10-1 CH/RW 10-1.
Installing the DM-II Probe CAUTION: Hopper surfaces may be hot. Make sure the drying hopper is empty and has cooled to room temperature before installing the probe assembly. Failure to do so can lead to serious injury. The DM-II probe is inserted through a hole in the top of the drying hopper and secured to a threaded coupling with a compression fitting. Mounting adapter plates may be necessary.
Mounting Method 1 ✐ NOTE: The mounting adapter kit will only be included if the DM-II was ordered as a retrofit kit. 1 Insert the probe through the coupling in the top of the drying hopper. 2 Screw the fitting into the coupling. Tighten with a wrench. Connector ✐ NOTE: If the angled probe is used, the bend in the probe must be oriented to the left of the probe connector. The male connector must face directly away from the center of the hopper. 3 Make sure the probe is the correct size.
Mounting Method 2 ✐ NOTE: The mounting adapter kit will only be included if the DM-II was ordered as a retrofit kit. Remove the mounting adapter plates from the probe assembly, you will not need them. You will need the gasket. 1 Reference the drawings at the end of this Appendix and select the drawing that reflects your installation. Drill the appropriate hole in the top of the hopper. 2 Drill and tap four 10-32 UNF 1/ 2 in. (12.
Mounting Method 3 ✒ TIP: Stretch cloth or plastic across the inside of the hopper to catch metal shavings from the hole you will drill in the top of the hopper. Tools for Installation: 1 Reference the drawings at the end of this Appendix and select the drawing that reflects your installation. Drill the appropriate hole in the top of the hopper. 2 Drill and tap three 10-32 UNF 45° holes to match the screw pattern in the adapter plates and gasket. You can use the template in the appendix.
Mounting Method 3 (continued) 6 Place the gasket over the probe hole. Connector 7 Place the adapter plates over the gasket and secure them to the hopper with three 10-32 UNF screws. Make sure the adapter plate with the threaded holes is on the bottom, and that the slots in the adapter plates are oriented in the opposite direction as shown. See drawing to right, #7. 8 Secure the coupling to the adapter plates with the four 10-32 UNF screws. 12 Nut 9 Screw the fitting into the coupling.
S e t t i n g U p Yo u r D M - I I - T h e B a s i c s ✐ NOTE: To understand the navigation of your control, see the Control flow diagrams beginning on page AA-22 of this appendix. There are also control flow diagrams in the operation section of your dryer manual. The DC2 control on your dryer ships with the drying monitor software installed, but all of the functions are turned off by default to avoid nuisance errors due to improper set up.
S e t t i n g t h e P r o c e s s Te m p e r a t u r e Setpoint on a Central Dryer If you are using a central dryer, you will need to set the process temperature on the Hopper Temperature Controller (HTC) connected to your drying hopper. See the Control Functions Flow Charts located in the Operations section of your HTC manual UGD031. SCREEN 4 (PROCESS TEMPERATURE SCREEN) Actual Setpoint 250 250 1 Navigate to the process temperature on the Hopper Temperature Controller (HTC).
S e l e c t i n g t h e L o w Te m p e r a t u r e RT D SCREEN B (DM-II LOW ALARM SELECT) DM LOW ALARM SELECT ✒ TIP: Conair recommends ✐ T4 EDIT controlling at an RTD in the middle of the material zone. This is the DM-II low alarm select screen. On this screen, you will need to select an For example a full hopper RTD to measure the temperature for your low temperature alarm. The default for this probably around RTD 3 or 4 screen is set to off.
Setting the Low Alarm Setpoint SCREEN C (DM-II LOW ALARM SETPOINT) DM LO ALARM SETPOINT SET 150°F Menu 1 This screen displays an automatically calculated value of the process temperature minus the offset screen “D”, see the drying monitor control function flow charts and descriptions later in this manual, minus ½ the band on screen “E”, see the drying monitor control function flow charts and descriptions later in this manual.
G e t t i n g t h e M o s t f r o m Yo u r D M - I I This simple overview provides an example of how the DM-II works. Detailed instructions for installation and operation are also contained in this appendix.
Appendix l AA-15
✒ TIP: For more information on screen navigation refer to the control function flow charts located in this appendix.
✐ NOTE: You will need to know the bulk density of your material to calculate your drying hopper volume in cubic feet (ft3). See page AA-40, "Understanding Bulk Density" and "How to Calculate Bulk Density". ✐ NOTE: Nuisance alarms may trigger if the selected RTD position is too close to the alarm set point. In this case, the operator would either simply select a lower RTD or adjust the alarm set point lower within the alarm band.
AA-18 l Appendix
Appendix l AA-19
AA-20 l Appendix
DM-II Series Control Functions Drying monitor functions are values that you can set or monitor in the Screen Title and Status Display windows. Press the Menu button then select the category buttons, then the Scroll List ▲ or ▼ buttons (Next/Previous) until the function you want to set or monitor appears in the Screen Title window. Control Function Flow Charts Menu Select Category The charts beginning on page AA-22 provide a quick summary of the control functions.
Main Menu/Display List POWER ON CONAIR CV00.06.2 CP100 DV00.09.
Vi e w / M o n i t o r O n l y (Changes can not be made on these screens.) DRYER MAIN MENU STAT SETUP DIAG DRYER STATUS PROC REGEN OTHER DRYER OTHER STATUS SCREENS From Dryer Control Flow Chart PANEL INSIDE TEMP ACT 100˚F ✐ Screen References A DM T6 TOP ACT 150 F NOTE: Due to tolerances of RTD’s it would not be uncommon to see a probe with a temperature that is higher located further up in the hopper. For example, T4 with an actual temperature of 164°F and T3 with an actual temperature of 159°F.
Set up Screen (Changes can be made to these settings.
Installing the DM-II as a Field Retrofit. ✐ NOTE: Installing the DM-II as a retrofit requires the service level password to set up the appropriate screens. Refer to the main portion of the dryer manual to access the password screen. Please contact Conair Service 1-800-458-1960 for the proper password.
Control Function Descriptions Screen Function SCREEN A Dryer Status Screens The A screens display the actual temperature of the material in the drying hopper at a particular vertical position (T1 through T6) within the hopper. T6 is the top or upper most temperature sensor in the DM-II temperature probe. T6 is located in the air void above the material. T1 is the bottom or lower most temperature sensor in the DM-II temperature probe and will be located toward the bottom of the material hopper.
C o n t r o l F u n c t i o n D e s c r i p t i o n s (continued) Screen Function SCREEN D Low Alarm Offset The Low Alarm Offset is the differential between the operator entered drying temperature setpoint and the upper value of the Low Temperature Alarm Band. The function of the Low Alarm "Offset" is to prevent nuisance alarms and allow the alarm band to change when the drying temperature setpoint is changed. The Offset is factory set to a default value of 10°F.
C o n t r o l F u n c t i o n D e s c r i p t i o n s (continued) Screen Function SCREEN G Low Alarm Setpoint This is the upper end of the Low Temperature Alarm Band. DM LO ALARM SETPOINT HIGH LIMIT 170 F SCREEN H Low Alarm Setpoint Low Limit DM LO ALARM SETPOINT LOW LIMIT 130 F SCREEN I Temperature Not Met Alarm Time Set DM TEMP NOT MET ALARM TIME SET 4 HRS The Supervisor Password is required to change the calculated value to a user-preferred value. This screen only displays the value.
C o n t r o l F u n c t i o n D e s c r i p t i o n s (continued) Screen Function SCREEN M Process Setpoint Screen M is used to set the Process Temperature Setpoint to match the temperature set on the Hopper Temperature Controller (HTC). The temperature set on the DC screen on the HTC and this screen must match in order for the DM-II to function properly and to avoid nuisance alarms. This applies to all central dryers. (dryers without process heaters.
Maintenance Checklist The DM-II requires little maintenance. We recommend the following maintenance schedule and tasks. • Whenever you change hoppers ❒ Verify or change setpoint entries on the control. Verify that the temperature settings are correct for the application and material in this hopper. • Whenever you change materials ❒ Change the setpoint entries on the control. Verify that the temperature settings are correct for the new material. ❒ Inspect the probe and mounting assembly.
Tr o u b l e s h o o t i n g Alarms Red - All DM-II alarms are passive and will not cause the dryer to shutdown. The amber light on the stack will be on. The dryer has stopped/shut down alarm on the dryer Amber - possible trouble/ DM-II passive alarm Green - running properly 1 Press the Acknowledge Alarm button once to display the alarm message. Pressing the Acknowledge Alarm button once also changes the alarm LED from blinking to solid. Menu Select Category Prev Process Blower Regen.
Pa s s i v e A l a r m s If the amber Acknowledge Alarm LED is blinking, the alarm is a passive alarm. The dryer continues to operate, but this problem could prevent correct drying of your material. Note that once the Acknowledge Alarm button is pressed once, the blinking amber LED becomes solid.
Pa s s i v e A l a r m s (continued) Problem Possible cause Solution Drying Monitor Low Temperature Alarm (DM Low Temp) - Once the temperature at the RTD selected in Screen B has reached the Low Temperature Alarm Setpoint in Screen C, the alarm will become active if the temperature drops below the Low Temperature Setpoint for a length of time longer than the delay time in Screen F. Material throughput too high. Ensure the material usage is within the rated capacity of the dryer and hopper in use.
Pa s s i v e A l a r m s AA-34 Problem Possible cause Solution Drying Monitor RTD Integrity Alarm - This alarm indicates that one or more of the RTD sensors within the Drying Monitor probe have failed. The drying monitor will continue to function as long as the RTD that has failed is not the one selected for the Low Alarm or High Alarm RTD, but the alarm will be present until the cause of the alarm has been corrected.
DOOR 24 IN. HOPPER LID 8.00 45.0˚ DOOR 10 IN. HOPPER LID 4.688 DOOR 33 IN. HOPPER LID 9.625 30.0˚ DOOR 14 IN. HOPPER LID 4.75 DOOR 39 IN. HOPPER LID 10.625 30.0˚ DOOR 18 IN. HOPPER LID 8.00 DOOR 44 IN. HOPPER LID 11.50 30.
D r y i n g H o p p e r Vo l u m e b y M o d e l N u m b e r Drying Hopper Hopper Diameter CH/RW 10-1 10 CH/RW 10-1.5 CH/RW 14-2 CH/RW 14-3 CH/RW 14-4 CH18-4 RW 18-5 CH/RW 18-6 AA-36 l Appendix 10 14 14 14 18 18 18 Volume (ft.³) RTD Position RTD Distance from the top Volume up to RTD position (ft.³) 1 5 8.38 0.85 1 4 12.88 0.65 1 3 17.38 0.45 1 2 21.88 0.28 1 1 26.612 0.09 1.5 5 8.88 1.37 1.5 4 16.13 1.04 1.5 3 23.38 0.72 1.5 2 30.63 0.46 1.
D r y i n g H o p p e r Vo l u m e b y M o d e l N u m b e r Drying Hopper Hopper Diameter CH 24-8 24 RW 24-9 CH/RW 24-12 CH/RW 24-15 CH/RW 24-18 CH/RW 33-21 CH/RW 33-28 CH/RW 39-35 24 24 24 24 33 33 39 Volume (ft.³) RTD Position RTD Distance from the top Volume up to RTD position (ft.³) 8 5 13.23 7.38 8 4 20.73 5.50 8 3 28.23 3.56 8 2 35.73 1.58 8 1 43.23 0.39 9 5 10.79 8.73 9 4 19.54 6.48 9 3 28.35 4.22 9 2 37.04 2.09 9 1 45.79 0.47 12 5 53.
D r y i n g H o p p e r Vo l u m e b y M o d e l N u m b e r Drying Hopper Hopper Diameter CH/RW 39-42 39 CH/RW 44-58 CH 54-70 CH 54-85 CH 54-99 CH54-114 CH 54-129 CH 64-158 AA-38 l Appendix 44 54 54 54 54 54 64 Volume (ft.³) RTD Position RTD Distance from the top Volume up to RTD position (ft.³) 42 5 25.25 42.38 42 4 41.25 31.32 42 3 57.25 20.26 42 2 73.25 9.72 42 1 89.25 1.90 58 5 27.00 59.24 58 4 44.50 43.84 58 3 62.00 28.45 58 2 79.50 13.
D r y i n g H o p p e r Vo l u m e b y M o d e l N u m b e r Drying Hopper Hopper Diameter CH 64-187 64 CH 64-215 CH 64-248 CH 74-245 CH 74-366 CH 74-487 64 64 74 74 74 Volume (ft.³) RTD Position RTD Distance from the top Volume up to RTD position (ft.³) 187 5 30.98 176.67 187 4 52.23 137.11 187 3 73.48 97.55 187 2 94.73 58.15 187 1 115.98 20.73 215 5 33.98 198.55 215 4 58.23 153.40 215 3 82.48 108.25 215 2 106.73 63.16 215 1 130.98 20.73 248 5 34.
Understanding Bulk Density Bulk density is the weight of material in pellet form, where the material has a lot of free space between pellets. It is not a specification that material suppliers typically provide. You may need to calculate the bulk density. It is important not to confuse bulk density with material density, which is the weight of the plastic in solid form without any air gaps between pellets.
