horiba twinno3 Reference guide

Add the standard
solution.
Sample the clear fluid on top.
Note: Read the Instruction Manual in
addition to this procedure.
Press the CAL switch.
Add the soil sample to water. Shake the soil-water mixture
for 1 minute.
Replace the existing sensor cover with
the filter paper holder cover provided.
Insert a filter paper.
Drop the sampled fluid onto
the filter paper.
Press the MEAS switch.
When using the meter for the first time, change the sensor cover.
1
300 ppm standard solution
Calibrate the sensor to ensure correct measurement.
3
Always rinse the sensor after use.
5
Take the measurement.
2Turn the power ON.
Press the ON/OFF switch.
4
Add enough of the sample to 60 mL of water
to bring the total volume to 70 mL.
Place the filter paper in the sensor unit, and close
the filter paper holder cover.
Sample the fluid after allowing the mixture
to settle for several minutes.
Guideline: 4 or 5 drops.
Rinse off the sensor with water.
Wait until the stability icon ( ) lights before
pressing the switch.
ON
/
OFF
OFF
MEAS
MEAS
CAL
CAL
ON
ON
/
OFF
OFF
MEAS
MEAS
CAL
CAL
ppm NO 3
-
ppm NO 3
-
CAL
CAL
Press
Press
Press
MEAS
* Always calibrate the sensor at least once per day.
MEAS
MEAS
CAL
CAL
ON
ON
/
OFF
OFF
Model B-342
Measurement Procedure
• Soil Measurement (Supplementary Information)
• Consumable parts (supplies)
Name Part No.
Replacement sensor 90880009000
Dedicated filter papers 90880015000
Filter paper holder cover 90880016000
30 ppm dedicated standard solution (Y044) 90880013000
300 ppm dedicated standard solution (Y042) 90880011000
• Procedure for Two Calibrations
(For More Accurate Measurement)
kg /10a
mVg / L
• The measurement procedure printed is just an example.
Soil with a moisture content of 25% has a soil-to-water ratio of
about 1:5. Measurement results are affected by the actual soil
moisture concentration.
• To eliminate the effect of the soil's moisture concentration, allow
the soil to air-dry, mix it with water in a ratio of 1 part soil to 5 parts
water, and sample the water from the top after the mixture has
settled.
• Accurate measurements can't be obtained from measuring fluid soil
suspensions (turbid samples). Use the dedicated filter paper to
perform measurement. You don't need the dedicated filter paper
when you have created your own method of removing suspended
particles using equipment such as a centrifugal separator or
general-purpose filter paper.
• The sensor is affected by light, so avoid direct sunlight.
• Measurement may be impeded in soil with significantly high electrical
conductivity, chloride ion (Cl-) concentration or oil concentration.
• Using the Onguard Ag chloride ion removal precolumn sold by
Dionex is an effective way to remove chloride ions (Cl-).
1.
1.
Follow the steps below to set the two-calibration mode.
Select the two-calibration mode from the special setting modes.
Perform two calibrations when you want higher-precision measurement.
① Press and hold the MEAS switch for at least
5 seconds to enter the special setting modes.
All the LCD segments light, then the display
on the right appears.
② Press and hold the CAL switch until the
icon and the number 3 appear.
③ Press the MEAS switch once (0.5 second) to
display the number of calibrations currently set.
When one calibration is set, the number 1
appears.
④ Press the CAL switch to display the number 2.
⑤ Press the MEAS switch.
The two-calibration mode is now set, and the meter returns to the
standard measurement mode.
2.
2.
Add some drops of the 30 ppm standard solution to the
sensor, and close the light shield cover.
3.
3.
Press the CAL switch for at least 2 seconds.
The icon flashes.
4.
4.
When the icon changes from flashing to steadily lit,
the first calibration has been finalized.
The first calibration must be finalized before you can
perform the second calibration.
5.
5.
Add some drops of the 300 ppm standard solution to the
sensor, and perform the second calibration by the same
procedure used for the first.
CODE: GZ0000096111
October, 2007 © 2007 HORIBA, Ltd.

B-342
標準液を入れる
上澄み液をとる
注：取扱説明書と併せてご使用ください
CALスイッチを押す
水に土を入れる 1分間ふる
付属のろ紙押さえ蓋に付け替える
ろ紙をはさむ
ろ紙にたらす
MEASスイッチを押す
測定手順
初めてお使いになる方へ
300ppm標準液
正しい 測定のために（校正）※1日1回必ず行ってください
使用後は必ず水洗してください
測定する
電源の入れ方
ON/OFFスイッチを押す
60mLの水に試料を入れ70mLにする
センサ部に置き、ろ紙押さえ蓋を閉じる 数分間静置の後、とる
目安：4〜5滴
水で洗い流す
安定マーク（ ）が点灯してから押す
／
／
／
・土壌測定について（補足）
・消耗品（補用品）
品名 部品番号
交換用センサ
専用ろ紙 
ろ紙押さえ蓋 
30ppm専用標準液（Y044） 
300ppm専用標準液（Y042）
・2点校正（より正確な測定のために）
特殊設定モードで2点校正を設定します。
より高精度な測定を行う場合に使用してください。

1.2点校正モードへの変更
・記載された測定手順は一例です。土壌中の水分を25%と仮定し
 た場合に、土壌と水の比率がおおよそ1:5になります。
 測定結果には、実際の土壌水分濃度が影響します。
・土壌水分濃度の影響をなくすためには、いったん土壌を風乾さ
 せた後に、土壌と水を1:5の割合で混ぜて水抽出してください。
・土壌懸濁液（濁った状態の試料）をそのまま測定すると、正確な
 測定ができません。専用ろ紙を用いて測定してください。遠心
 分離機やろ紙等で、独自に懸濁粒子を除去した場合は、専用ろ
 紙は不要です。
・センサは光の影響を受けます。直射日光を避けてください。
・電気伝導率、塩化物イオン（Cl-）濃度、油脂濃度が著しく高い土
 壌においては、測定が妨害される場合があります。
・塩化物イオン（Cl-）の除去には、ダイオネックス社が販売してい
る、OnguardAgという塩化物イオン除去プレカラムが有効です。

①MEASスイッチを5秒以上押し続け、
 特殊設定モードにします。
 LCDが全点灯した後、右図の表示画面に
 なります。
② CALスイッチを長押しし、 表示の点
 灯と3の表示に合わせます。


③ MEASスイッチを1回（0.5秒）押すと
 校正点数の数値が表示されます。設定が
 1点校正の場合は1が表示されます。

④ CALスイッチを押して2を表示させます。


⑤ MEASスイッチを押します。
 2点校正モードに設定され、通常測定モードに戻ります。
2. 30ppmの標準液をセンサに滴下します。

3. CALスイッチを2秒以上押します。
 表示が点滅します。

4. 表示の点滅が点灯に変わったら、1点目の校正が確定
 されます。
 1点目の校正を確定しないと、2点目の校正ができません。

5. 300ppmの標準液をセンサに滴下し、1点目の校正
 と同様に2点目の校正を行います。
CODE:GZ0000096111
October,2007©2007HORIBA,Ltd.