Celestron 94037 Instruction Manual

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THERMISTOR FOR

SMART DEWHEATER CONTROLLERS

# 94037

INSTRUCTION MANUAL

The Thermistor for Smart DewHeater Controllers is required for automatic “smart control” of a non-Celestron heating band or heating strip with the Celestron Smart DewHeater Controllers. The thermistor allows the controller to detect how much heat the heating band is applying to the telescope. Along with the controller’s integrated environmental sensor, the thermistor helps determine how much power the heating band needs to keep the optics free from dew. This system provides the most efﬁ cient power usage for dew prevention, greatly extending battery life. If you choose not to use the thermistor, you can only set the heating band power manually. If you are using a Celestron Dew Heater Ring, this thermistor assembly is not required, as the ring already has a built-in thermistor.

If you are using another manufacturer’s heating band or strip, it needs an RCA-type plug to connect to the controller’s heater output ports. Connect the heating band to the telescope and connect its plug to one of the controller’s dew heater ports. Then, place the tip of the probe thermistor under the heating band (Figure 1). We suggest using tape to secure it ﬁ rmly in place.

Fig. 1: Place the thermistor under the heating band so that it is secure.

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Connect the thermistor’s plug to the thermistor port corresponding to the dew heater port you are using on the controller (Figure 2). Once the thermistor is connected, the controller will automatically adjust the power to the heating band based on the data from the thermistor and the controller’s environmental sensor.

Each dew heater port on the controller can deliver a maximum of 84W power (7A max current), which should be more than enough for most dew heating bands or strips. For more information about automatic “smart control” of a dew heater, refer to the instruction manual included with your Celestron Smart DewHeater Controller.

Fig. 2: Connect the thermistor’s plug to the thermistor port corresponding to the dew heater port you are using on the controller

SPECIFICATIONS: Thermistor plug: 2.5mm Audio

FCC N OTE : This eq uipmen t has be en tes ted and f ound t o comply w ith t he limi ts for a C lass B d igita l devi ce, pur suan t to par t 15 of the F CC Rules. Th ese lim its a re desi gned to pr ovid e reas onabl e prot ecti on agai nst ha rmfu l inter ference in a re siden tial in sta llat ion. Th is equip ment ge nerat es, us es, a nd can ra diat e radio f reque ncy ene rgy and , if not i nsta lled an d used in accor danc e with t he ins truc tions , may ca use ha rmfu l inter ference to r adio co mmunic ation s. Ho wever, t here i s no guar ante e that i nter fere nce wil l not occ ur in a par ticular ins tall ation . If this eq uipmen t does ca use harmf ul inter ference t o radio o r telev ision recep tion, w hich can be det ermined by tur ning the equipm ent of f and on, the use r is enco uraged t o try to cor rect t he inter ference by o ne or more of the f ollowing me asure s:

• Reor ient or r elocate th e receiving a ntenn a.

• Incre ase the sepa ration bet ween the equi pment a nd rece iver.

• Conne ct the equipmen t into an out let on a cir cuit diffe rent from th at to which th e receiver is c onnected.

• Consu lt the dealer o r an experienc ed radio/ TV technic ian for help.

This de vice compli es with pa rt 15 of the FC C Rules. Ope ration is s ubject to the f ollowing t wo condit ions: (1) T his device m ay not caus e harmful in terfer ence, and (2 ) this devic e must acce pt any int erferenc e received , includi ng inte rfer ence that ma y cause undes ired ope ration.

Plea se not e that change s or modiﬁca tions not exp ress ly approved b y the part y responsibl e for complian ce could void th e user’s aut horit y to operat e the equipmen t.

Produ ct design and sp eciﬁcati ons are subjec t to change wi thout prior n otiﬁcat ion. This pr oduct i s design ed and intende d for use by tho se 14 years of ag e and older.

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