Dickson Industrial THDx Manuel - Page 3

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Operating Information

Pens

The blue pen has a longer pen arm and records

humidity or dew point (depending on your dip switch

selection). The red pan has a shorter arm and re-

cords temperature. The pens are offset to allow the

red pen to glide under the blue pen. The blue pen

indicates the correct time and the red pen precedes

it by 3/16 of an inch.

The pens move in increments across the chart

as sensor readings change. The display provides

smoother and faster readings than the pens. At any

given time there may be a slight discrepancy in the

position of the pen and the reading on the display

due to hysteresis.

For visual spot checks the display is more ac-

curate than the pen position but both are within the

stated specifications of the unit.

Pen Adjust

Pen adjustment may be needed if the pens and

display do not match exactly.

1. Make sure the pen lifting bar is lowered and

press the "Pen Home" key.

2. Turn the chart hub clockwise, rotating the chart

3. With a small screwdriver loosen the pen adjust

screw on the pen arms and adjust the pen tips

to the outer most circle on the chart.

4. Retighten the screws. After pressing "Pen

Home" again the pens should now read

correctly with the display.

Probe

The THDx probe sits in the cradle in the back of the

unit. The THDx probe comes with the standard 8"

cord. An extension cord can be ordered to allow for

remote sensing capabilities.

Display Symbols

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Alarm is on.

Rev. 06/03

Cord Installation

If you have ordered an extension cord for remote

sensing capabilities follow the instructions for cord

installation listed below.

1. Turn the unit upside down or on its side so that

you can see where the probe connects to the

back of THDx.

2. Twist and pull the black rubber strain relief,

beginning on the back of the recorder body

(see "Instrument Anatomy").

3. Slide the strain relief on the cord

4. Inside you will see a standard connector which

looks like a phone jack. Using a small screw-

driver, press retention tab and the connector

will pop out easily.

5. Remove wand from cradle by sliding upward.

Repeat steps 1 through 3 for the portion of the

cord that connects to the wand.

6. Return the wand to the cradle mounted

position by sliding the wand down into the

cradle until it fits into the grips. The probe can

also be replaced by positioning it in back of the

cradle area pressing it into the cradle until it

snaps in place.

Power Supply

We recommend using AC power with four "D"

batteries installed as a back-up power source. This

ensures that your recording will not be interrupted

when there is a power failure. When the instrument

is using battery power, the unit will update very

slowly to extend battery life. The 120V AC adapter

plugs into the back of the recorder beneath the

probe cradle.

Lo Batt: Low battery indicator

UC: the unit is in "User Calibration" mode. This

is displayed in the upper right hand corner of the

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display.

Reading Update Indicator: These rectangles will

flash along the bottom of the display as long as the

recorder is taking readings. If you are using batteries

as the power source the update indicator rectangles

will still flash but the rate will be very slow in some

modes and "B" will light on display. The rectangle

furthest to the right is lit continuously when the unit

is using battery power.

MIN: This symbol is displayed when you are setting

a maximum alarm or when you have pressed the

"MIN/MAX" key and the maximum value is being

Figure 4

displayed.

MAX: This symbol is displayed when you are setting

a minimum alarm or when you have pressed the

"MIN/MAX" key and the maximum value it being

displayed.