Mitutoyo HH-336 Hardness Tester

Model No.: 811-336-10 (HH-336-01 is the equivalent variant)

ชุด: HARDMATIC HH-300 (811 ชุด)

พิมพ์: Compact Digital Shore A Durometer

ข้อมูลจำเพาะพื้นฐาน

มาตราส่วน: Shore A

Form: ขนาดกะทัดรัด, จอแสดงผลดิจิตอล

Indenter: 35° truncated cone, tip diameter φ0.79 mm, shank φ1.25 mm

Indenter projection: 2.5 มม

Applicable materials: General rubber, elastomers, soft PVC, soft plastics, leather, neoprene and other soft materials

แหล่งจ่ายไฟ: SR44 silver oxide button cell

ขนาดโดยรวม: 59×40×147 mm

น้ำหนัก: 290 ก

ฟังก์ชั่น: Peak hold, data lock, Digimatic output for MeasurLink data collection

อุปกรณ์เสริมเพิ่มเติม

Test stand for calibration: CTS-103 (หมายเลขคำสั่งซื้อ. 811-013), exclusively for HH-335 / HH-336

Shore A calibration test blocks, data cable

คู่มือการเลือกซีรี่ส์

HH-330: Compact digital Shore E (โฟม, ultra-soft rubber)

HH-332: Long-handle digital Shore A (grooves, ฟันผุลึก)

HH-334: Long-handle digital Shore D (hard rubber & rigid plastics)

HH-336: Compact digital Shore A (รุ่นนี้)

HH-338: Compact digital Shore D

หมายเหตุเพิ่มเติม

มาตรฐานการปฏิบัติตาม: ไอเอสโอ 7619, ASTM D2240

Compact model: for flat open specimens; long-handle model: for narrow recessed areas

ทางเลือก: Domestic digital Shore A durometers can be used for comparison, but indent geometry and metrology systems differ. ต้นฉบับ มิตูโตโย is preferred for export quality control.

Mitutoyo HH-336 (811-336-10 Digital Shore A Durometer)

มาตรฐาน: ASTM D2240 / ไอเอสโอ 7619; with peak hold & Digimatic data output; แบตเตอรี่: SR44

Full Operating Procedures (Handheld & CTS-103 Stand Mount)

Pre-Test Preparation

การทำความสะอาด: Wipe the pressure foot, indenter and specimen surface free of oil, dust and debris. Never strike the indenter.
Specimen requirements: Rubber/elastomer thickness ≥6 mm; measuring points ≥12 mm from edges; spacing between points ≥6 mm; place specimen on a rigid flat plate without soft backing.
เปิดเครื่อง: Short press the power key. With no load on the indenter, the reading shall be 0.0 ฮ่า; perform zero reset if offset.
การเลือกโหมด: Use Peak Hold to lock the maximum reading automatically; real-time reading mode is also available.

Stand mounting (CTS-103): Fix the durometer vertically and apply load by dead weight to eliminate manual pressure variation, recommended for outgoing inspection and metrology comparison.

Handheld Measurement Steps

Keep the durometer perpendicular to the specimen surface; no tilting.
Press down smoothly until the entire pressure foot fully contacts the specimen (do not only push the indenter); complete the action within 1 ที่สอง.
Peak mode: The display locks the peak hardness value; record the reading and release to let the indenter rebound to zero.
Take at least 5 readings per sample, discard outliers and calculate the average; increase point spacing to 15 mm for soft foams.
Power off after use; remove the battery for long-term storage.

CTS-103 Stand Operation (QC Preferred)

Clamp the HH-336 firmly and adjust vertical alignment; clean the worktable.
Place the specimen at the table center.
Turn the crank to lift the worktable slowly until the pressure foot fully seats on the specimen, then record the reading.
Lower the table and repeat on new test points.

Important prohibition: Do not hold continuous pressure on the sample; soft rubber will creep and cause low readings.

การสอบเทียบ & Verification Methods (Daily Check, Block Verification, Annual Metrology)

⚠️ The internal spring and indenter geometry are not user-adjustable. If out of tolerance, send the unit to Mitutoyo or an accredited lab for repair. The following are only verification steps, not hardware adjustment.

Daily Zero Check (Every Power-On)
Suspend the unit with no force on the indenter; power on and press ZERO to set the display to 0.0.
Press firmly against a flat optical glass plate until the indenter retracts fully. The reading shall be approximately 100 ฮ่า (tolerance ±1 HA).

If not reaching 100 ฮ่า: Clean the indenter gap with alcohol, repeat pressing 3–5 times. If still abnormal, stop use and submit for inspection.

Verification with Standard Hardness Blocks (รายวัน / Batch Change)
Use certified Shore A calibration blocks covering low, medium and high ranges (เช่น, 30ก, 60ก, 80ก).
Zero first, then press vertically onto the block with full foot contact, record the peak reading and compare with the block nominal value.
Pass criterion: Error ≤ ±1 HA. If exceeded, discontinue use and send for calibration.

Recommended cycle:

การประชุมเชิงปฏิบัติการ: Daily verification

External calibration: Once per year (CNAS certificate)

After dropping or indenter impact: Immediately stop use and re-calibrate.

Full Calibration Items by Metrology Lab

Zero point & full-scale (100 HA on glass) indication error

Indenter projection length: 2.5 mm nominal

Indenter geometry: 35° cone, tip diameter φ0.79 mm

Spring test force verification

III. การแก้ไขปัญหา

ความผิดพลาด	สาเหตุที่แท้จริง	การเยียวยา
ไม่มีการแสดงผล / black screen	Dead SR44 battery, ขั้วกลับกัน, หน้าสัมผัสออกซิไดซ์	Replace SR44 cell; clean spring contacts; ตรวจสอบขั้ว
Cannot zero / zero drift	Sticking indenter, rubber/dust trapped in gap, ความเหนื่อยล้าในฤดูใบไม้ผลิ, faulty zero key	Clean indenter gap with alcohol cotton swabs; do not apply oil; re-test after cleaning; persistent drift → send for repair
Unstable readings, large variation between repeated tests	1. Tilting instrument; 2. Thin/soft specimen with bottom compression; 3. Incomplete foot contact; 4. Material creep; 5. Worn indenter	Measure vertically; thicken sample or use rigid backing plate; ensure full foot contact; shorten dwell time; inspect indenter tip for chipping
Low readings, cannot reach high values	Chipped/worn indenter tip, weakened spring, stuck indenter	Visually inspect indenter; ทำความสะอาด; if no improvement, replace indenter/spring assembly at service center
Reading far below 100 HA on glass	Foreign matter jamming indenter, deformed pressure foot, internal mechanical damage	Clean thoroughly; never strike the unit; if unresolved, send to metrology service (no user spring adjustment)
Hold function fails / keys unresponsive	ความชื้นเข้า, aged switches, temporary program glitch	ปิดเครื่อง, remove battery and rest 5 minutes before reinstallation; keep unit dry; do not rinse with water
No Digimatic output	Mismatched cable, dirty port, incorrect MeasurLink settings	Use genuine Mitutoyo Digimatic cable; clean connector pins; verify software communication parameters
Err error code on screen	Overrange or mechanical jamming	Release the indenter, zero and restart; repeated errors indicate internal failure – send for service

การซ่อมบำรุง & ข้อควรระวัง
Never drop or strike the indenter; the hard metal tip will be damaged permanently after impact.
Only clean with anhydrous ethanol and soft cotton swabs. Do not use oil or WD40, which will trap debris and cause sticking.
Avoid prolonged sustained compression to prevent spring fatigue.
พื้นที่จัดเก็บ: Keep dry at ambient temperature, ห่างจากแสงแดดโดยตรง, ozone and high heat. Remove the battery during long-term storage to prevent leakage.
Scale distinction: HH-336 = Shore A. Use HH-338 (Shore D) for rigid plastics; Shore A readings are invalid on hard materials.

Full Model List of Mitutoyo Hardness Testers (By Category)

บันทึก: HH-300 (811 ชุด) = HARDMATIC Shore Durometers; HH-411/HH-V400 = Rebound Leeb testers; HR = Rockwell; HV = Vickers; HM = Micro-Vickers; คำต่อท้าย -01 denotes equivalent variants. Stands are listed separately.

HH-300 Series Shore Durometers (811 Series for Rubber / โฟม / พลาสติก, including HH-336)

แบบอย่าง	หมายเลขคำสั่งซื้อ.	แสดง	แอปพลิเคชัน
HH-329	811-329-10	Analog dial	โฟม, ultra-soft rubber, felt, sponge
HH-330	811-330-10	ดิจิตอล	โฟม, soft sponge, deep recesses
HH-331	811-331-10	Analog dial	General rubber, soft PVC
HH-332	811-332-10	ดิจิตอล	ยาง, soft plastic, narrow grooves
HH-333	811-333-10	Analog dial	Hard rubber, rigid plastic, bakelite
HH-334	811-334-10	ดิจิตอล	Epoxy, hard plastic, hard rubber
HH-335	811-335-10	Analog dial	Elastomers, general rubber
HH-336	811-336-10	ดิจิตอล	General rubber & soft plastic (รุ่นปัจจุบัน)
HH-337	811-337-10	Analog dial	Hard rubber, rigid plastic
HH-338	811-338-10	ดิจิตอล	Hard plastic, rigid rubber