Helmer Scientific i.Series
®
Ultra-Low Freezer
Service and Maintenance Manual
360173-A/C
8
Install / Replace Chart Paper
Notes
• For accurate temperature reading, ensure the current time is aligned with the time line groove when chart knob is tightened
• Contact Helmer Customer Service to reorder chart paper; part number 800197-1 (52 sheets).
Chart recorder stylus and time line groove
1. Press and hold
C
button. When stylus begins to move left, release button. The LED flashes to indicate current
temperature range.
2. When stylus stops moving, remove chart knob then move knob up and away.
3. Place chart paper on chart recorder.
4. Gently lift stylus and rotate paper so current time line corresponds to time line groove.
5. Hold chart paper and reinstall chart knob is fully tightened.
(Failure to fully tighten the knob can result in paper slipping and
losing time.)
6. Press and hold
C
button. When stylus begins to move right, release button.
7.
Confirm stylus is marking on paper and stops at the correct temperature.
8. Calibrate chart recorder to match primary temperature if needed and close recorder door.
2.6 External Monitoring Devices
The remote alarm interface is a relay switch with three terminals:
♦
Common (COM)
♦
Normally Open (NO)
♦
Normally Closed (NC)
Terminals are dry contacts and do not supply voltage. Interface circuit is either normally open or normally closed, depending on
terminals used.
Requirements for your alarm system determine which alarm wires must connect to terminals.
CAUTION
• The interface on the remote alarm monitoring system is intended for connection to the end user’s central alarm system(s)
that uses normally-open or normally-closed dry contacts.
• If an external power supply exceeding 30 V (RMS) or 60 V (DC) is connected to the remote alarm monitoring system’s
circuit, the remote alarm will not function properly; may be damaged; or may result in injury to the user.
The terminals on the remote alarm interface have the following maximum load capacity:
♦
0.5 A at 30 V (RMS)
♦
1.0 A at 60 V (DC)
Connect to Remote Alarm Interface
1. Switch battery ON/OFF switch
OFF
. Switch AC ON/OFF switch
OFF
.
2. On the back of the freezer, locate the remote alarm terminals.
3. Connect remote alarm wires to appropriate terminals, according to requirements for your alarm system.
4. Use a cable tie to relieve strain on alarm wires (as necessary).
5. Switch AC ON/OFF switch
ON
. Switch battery ON/OFF switch
ON
.
6. Touch
Mute or raise the high alarm limit
to disable the high temperature alarm while freezer reaches operating temperature.
(If high alarm limit is changed, it must be changed back prior to operation of freezer.)
