H-25C Instruction Manual
Instruction 3015-0216
33
4. Measurement
Operations
This chapter explains how the H-25C works, and how to detect leaks with it. Note that before doing any of the
operations described here, you must first complete the operations described in Section 2 (switch setup, etc.) to
prepare the H - 2 5C for use.
4.1
Choosing a Location for the H-25C, and Getting Ready to Start Measurement
4.1.1 Choosing a Location
The H-25C Halogen Leak Detector should be placed on a flat, horizontal surface such as a bench or
table top when in use.
Since it is fairly heavy at about 10 kg (22 lb), the main unit will not easily slide off the table or bench even
if you pull on the probe. However, consider that risk and make sure that you choose a stable surface on
which to place it; a fall to the floor will probably cause the instrument to fail.
Keep in mind that instrument needs a location where the air is clean and pure, and a surface free of
vibration. Facilitating leakage inspections varies depending on whether or not leakage inspection areas
are clean; the service life of sensor and activated-charcoal filters also vary. for reference, examples of
facilities that rid the atmosphere of unwanted gases where leakage inspections are made are given at the
end of the manual (after chapter 6).
4.1.2 Getting Ready for Measurement
(1) Connecting the Power Cable
Supply the H-25C with AC power of 100 / 115 V or 120 / 240 V, as appropriate to its specifications
and the supply voltage selector switch position.
Connect the plug on one end of the power cable to the power connector (socket) on the main unit,
and then connect the other end to the AC line receptacle.
Use the supply voltage selector switch on the rear of the H-25C to select 100 and 115 V, 110 and
22OV, or 120 and 24O V.
CAUTION:
Never connect power in the 200 V range to an H-25C with the 100/115 V specification, or
to one whose supply voltage selector switch is in the 120 V position; the instrument will be
damaged.
(2) Wiring the Analog Signal Output (if equipped with analog signal output function)
If you wish, you can order the H-25C with a function that outputs the measured value as a 0 to 1 V
DC analog signal. If your instrument has this function, connect the wiring from the instrument to the
recorder or other destination. (See Figure 4.1.)
Note that the output resistance is less than 1
Ω
. The 0.5 V level of the 0 to 1 V DC output signal
corresponds to the alarm point setting value. This relationship always remains the same, and is
unaffected by sensitivity changes in search mode, etc.
