Seiko AQUA Touch Plate

From Libre Aquatics Wiki, the free aquatics reference

The AQUA touch plate is a swimming touch panel made by Seiko Time Creation Inc. of Tokyo. It is the panel hung at a lane end that senses the swimmer’s finish and turn, converting the touch into an electrical signal that reaches the printing timer through that lane’s lane box.¹² It is the larger of the two touch plates Seiko currently sells, and the only one the company lists as conforming to World Aquatics rules; the narrower full-frame touch plate carries a Japanese certification only.¹³² Seiko’s own system diagram names this plate as the touch plate of its competitive swimming system.⁴

Role in the timing system¶

The touchpads overview covers the history of automatic touchpad timing and the World Aquatics requirements that apply to every touch panel. The AQUA plate sits at the wall end of a chain that Seiko builds as a single certified system: the plate reports to a lane box, one per lane, which sorts that lane’s signals and passes them to the PT-9000 printing timer, while the PS-1400 start sound generator supplies the start signal at the other end.²⁵⁶

Seiko applies the same pair of compliance lines to the plate as to the rest of that system, stating that it conforms to World Aquatics rules and is certified Class AA and Class A by the Japan Swimming Federation.¹² Those are the company’s own statements of certification, not an independent test result.

Naming and model numbers¶

Seiko publishes no model number for this plate in Japanese. The product page and the swimming catalogue both call it タッチプレート（AQUAタイプ）, “touch plate (AQUA type)”, and give a four-row specification table with no part number anywhere on it.¹² The storage cart, the lane box and the starting block are named the same way, by description rather than by number, while the printing timer and the start sound generator in the same catalogue do carry model numbers.²

Seiko’s English swimming pages do give model numbers, TP-3000 and TP-3019, but they describe a different pair of panels and none of their figures match. The English page gives the TP-3000 as 2420 W × 917 H × 68 D mm and approximately 20 kg, with an aluminium and stainless-steel frame and a PVC front panel finished in a yellow resin fine-particle coating, and cites FINA rules rather than World Aquatics; the TP-3019 is the same construction at 1980 mm wide.⁷ The Japanese material gives a high-impact resin panel, 2,400 W × 900 H × 77.5 D mm and about 22 kg.¹²

Seiko’s English swimming section has been only partly updated, so its pages cannot be read as a single generation. The PS-1400 starter page there is current and cites World Aquatics rules, while the touch pad, lane box and printing timer pages still cite FINA rules, still name a PT-8000X timer where the Japanese pages name the PT-9000, and still power the lane box from a PT-8000.⁷⁸⁹¹⁰⁶ The description of the TP-3000 as a framed panel also matches the construction Seiko still sells as the full-frame type rather than the AQUA type. This article therefore treats the Japanese product page and the December 2025 catalogue as current and does not apply the TP-3000 number to this plate; Seiko does not publish a statement connecting the two.

Design and construction¶

Seiko gives the surface panel material as a high-impact resin board and the plate’s overall dimensions as 2,400 W × 900 H × 77.5 D mm, described as a maximum figure.¹² The sensing area is 10 mm thick, which is the panel thickness the World Aquatics facilities rules specify for a touch panel, and the 2,400 mm width and 900 mm height are the minimum panel size those rules set.¹¹¹ The plate weighs about 22 kg.¹² Catalogue photographs show it finished in yellow with a dark cross marking at the centre, the end-wall line marking the rules require.²¹¹

Seiko labels the sensing-surface row 感動面 in the catalogue and on both product pages, where the expected term is 感応面, “sensing surface”. The spelling is consistent across its material, so a search on the correct term will not find these specifications.¹³²

The 77.5 mm overall depth is much greater than the 10 mm sensing area, so the figure covers the plate’s frame and mounting hardware rather than the panel alone. Seiko does not break the dimension down, and does not publish the number of switches or sensing zones behind the face, the activation force, or an operating temperature range.¹²

Sensing and wave rejection¶

Seiko describes the plate as detecting only the swimmer’s touch, without responding to water pressure or splashes, and converting that touch instantly into an electrical signal sent to the printing timer.¹² The company does not say how the panel makes that distinction, and publishes no sensing principle for the current product.

One approach the group has taken to that problem appears in a patent. Japanese patent application JPH08257196A, 競泳用タッチ板, filed in March 1995 by Michio Tomita and published in October 1996, describes a touch plate built as a substrate carrying a bonded panel switch with a fine-mesh member laid over it. A swimmer’s touch bears on the raised points of the mesh and concentrates enough pressure on the switch to close it, while the distributed load of wave action spread across the whole face does not, so the panel discriminates by how the force is applied rather than by its total magnitude. The patent claims a simpler assembly and more even sensitivity across the face than the designs it compares itself with, and notes that two switches can be stacked as a backup within the thickness the rules allow.¹²

That patent is assigned to Seiko Instruments Inc., a separate company within the Seiko group from Seiko Time Creation, and it lapsed for non-payment of fees in 2012.¹²¹³ Nothing published connects it to this product, and it is cited here as evidence of how the group has approached the sensing problem, not as a description of the plate on sale. The touchpads overview sets this alongside the air-filled and conductive-plate designs other manufacturers use.

Mounting¶

Seiko does not publish the plate’s mounting method, its fixing hardware, or whether it hangs from the gutter or fixes to a flat wall. The catalogue and the product page give the specification table and a photograph only, and no installation document for the plate is available: Seiko’s manual download index lists no touch plate, and its swimming category holds only the SB-5010 and SB-5020 scoreboards.¹²¹⁴ The 77.5 mm maximum depth against a 10 mm sensing area implies a frame or bracket, but Seiko does not describe it.

The company does document handling off the wall. A dedicated steel storage cart takes six AQUA plates, measures 2,500 W × 1,380 H × 610 D mm including its wheels and excluding protrusions, and weighs about 40 kg empty.²¹⁵ Portability is consistent with the facilities rules, which allow a touch panel to be removable so it can be taken out when no race is being held.¹¹

Connection to the timer¶

The plate does not wire directly to the timer. Each lane has a lane box, which takes the signals from that lane’s starting block and touch plate, sorts them by lane, and passes them to the printing timer.²⁵ The lane box is an ABS case in dark grey measuring 170 W × 50 H × 100 D mm excluding protrusions, weighing 450 g with a 230 g cable of 3.7 m, and it uses waterproof connectors.⁵ Seiko does not publish the connector type on the plate itself, the plate’s own cable length, or a pin assignment.

Timekeepers’ pushbuttons run through the same box. Seiko sells a backup grip switch system in which three timekeepers per lane operate grip switches feeding the printing timer, using an LB-10M lane box and GS-72 grip switches on a 5.5 m cable, with twelve lane boxes and thirty grip switches in a ten-lane configuration. The timer resolves the manual times by rule: where two of the three agree it takes that time, where all three differ it takes the middle one, where only two are available it averages them, and where only one is available it takes that.¹⁶ Seiko’s older English lane box page describes the same box sorting five signals from touch pads, relay take-off sensors and three grip switches.¹⁰

At the timer the plate’s signal is one of several the operator can check and correct. The PT-9000 can verify touch plate signals separately on the starting and turning sides, and its hold time, the interval during which a further signal from the same plate is ignored, is settable between 5 and 90 seconds to prevent spurious inputs during a race.²⁶

Compared with the full-frame touch plate¶

The two plates Seiko sells differ in size, depth, weight and certification rather than in stated function; the description of what they do is word for word the same on both product pages.¹³

	AQUA type	Full-frame type
Width	2,400 mm	1,900 mm
Height	900 mm	900 mm
Depth	77.5 mm (maximum)	15 mm
Sensing surface	10 mm thick	10 mm thick
Weight	Approx. 22 kg	Approx. 15 kg
Panel material	High-impact resin board	High-impact resin board
Certifications	World Aquatics rules; Japan Swimming Federation Class AA and Class A	Japan Swimming Federation Class A
Storage cart	6 plates, approx. 40 kg	10 plates, approx. 130 kg

World Aquatics facilities rules set a minimum touch panel width of 2.4 m. The AQUA plate meets that figure exactly and the 1,900 mm plate does not, and Seiko lists only the AQUA plate as conforming to those rules.¹¹¹³ The full-frame plate is much shallower, at 15 mm against 77.5 mm, and lighter by about 7 kg.³²

In competition¶

Seiko touch plates have been in use for decades. The Seiko Museum Ginza holds a swimming touch pad dated 1986 in its sports timing collection, described in the same terms the company still uses, as disregarding water pressure and wave splashes while reliably sensing the swimmer’s touch, and notes that the equipment is still used in major swimming competitions.¹⁷ Seiko is the Japan Swimming Federation’s official timekeeping partner and supplies the timing for the major domestic championships.¹⁸²

Seiko’s touch plates were also the subject of a dispute in international competition. Seiko timed the swimming at the 2001 World Aquatics Championships in Fukuoka, where the touchpads malfunctioned repeatedly across the eight days of competition and times had to be corrected from backup timing or video evidence. The system recorded an early take-off of minus 0.06 s that disqualified the United States women’s 4 × 200 m freestyle relay on a successful British protest; the disqualification stood, and the governing body, then FINA, awarded the United States a second set of gold medals without changing the official result. It defended the equipment, saying swimmers had to strike the pads in the right way, and then signed a three-event deal with Swiss Timing covering the 2002 world short-course championships and the 2003 and 2005 championships.¹⁹²⁰ Swimming World proposed on 30 July 2001 that FINA ship the lane touchpads, the timing system terminal and the backup system to an independent testing laboratory in Germany, and offered to publish the results; its editor-in-chief, Phillip Whitten, described this as a way to settle the question of the system’s accuracy for the athletes who had competed.²¹

Seiko does not document which touch plate was in use at Fukuoka, and no source connects the equipment of 2001 to the plate described here. The Seiko vendor page sets the episode alongside the company’s wider timing record.

Specifications¶

Touch plate:


Surface panel material	High-impact resin board
Dimensions	2,400 W × 900 H × 77.5 D mm (maximum)
Sensing surface	10 mm thick
Weight	Approx. 22 kg
Certifications	World Aquatics rules; Japan Swimming Federation Class AA and Class A

Storage cart:


Capacity	6 plates
Material	Steel plate
Dimensions	2,500 W × 1,380 H × 610 D mm (including wheels, excluding protrusions)
Weight	Approx. 40 kg (cart alone)

Seiko does not publish a part number, cable length, connector type, activation force, switch or zone count, operating temperature range or installation method for this plate. Those rows are omitted here rather than estimated.

Part numbers and accessories¶

Touch plate (AQUA type), sold without a published part number in Seiko’s Japanese material.
Touch plate storage cart for the AQUA type, six plates, also unnumbered.
Lane box, one per lane, carrying the plate’s signal and the starting block’s to the printing timer.
LB-10M lane box and GS-72 grip switches (5.5 m cable), the backup grip switch system, supplied to order.
TP-3000, the model number Seiko’s older English pages give for a 2420 mm framed touch pad, with a TF-40 storage cart. Seiko does not state how it relates to the AQUA type.

References¶

Seiko Time Creation, タッチプレート（AQUAタイプ） (Japanese product page, with the specification table and certification lines). ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴
Seiko Time Creation, Swimming Systems Catalogue (December 2025), pp. 3, 5, 6, 7 and 8. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹
Seiko Time Creation, タッチプレート（1,900mmフルフレームタイプ） (Japanese product page for the narrower plate; its table omits the sensing-surface thickness). ↩ ↩² ↩³ ↩⁴ ↩⁵
Seiko Time Creation, 競泳システム (system overview naming the AQUA-type plate). ↩
Seiko Time Creation, レーンボックス (waterproof connectors, one box per lane). ↩ ↩² ↩³
Seiko Time Creation, 競泳用自動審判計時装置 PT-9000. ↩ ↩² ↩³
Seiko Time Creation, Touch Pads TP-3000 / TP-3019 (English product page; frame and PVC panel construction, and the TF-40 storage cart). ↩ ↩²
Seiko Time Creation, Electronic Starting System PS-1400 (the English page that is current, citing World Aquatics rules). ↩
Seiko Time Creation, swimming products (English index listing the PT-8000X and the current PS-1400 side by side). ↩
Seiko Time Creation, Lane Box LB-90～99, LB-9S, LB-9M (English page; five signals sorted, powered from the PT-8000). ↩ ↩²
World Aquatics, Facilities Rules 2021–2025, FR 2.3 Automatic Officiating Equipment for Swimming (touch panels: FR 2.3.4). ↩ ↩² ↩³ ↩⁴
Google Patents, JPH08257196A, 競泳用タッチ板 (Seiko Instruments; inventor Michio Tomita; filed 20 March 1995, published 8 October 1996, lapsed 2012). ↩ ↩²
Seiko Group Corporation, グループ会社一覧 (listing Seiko Time Creation and Seiko Instruments as separate subsidiaries). ↩
Seiko Time Creation, manual index (the data behind the 取扱説明書 download page; its swimming category holds only SB-5010 and SB-5020). ↩
Seiko Time Creation, タッチプレート収納台車 (both storage carts). ↩
Seiko Time Creation, バックアップ用グリップスイッチシステム (LB-10M, GS-72, and the rule for resolving three manual times). ↩
The Seiko Museum Ginza, Swimming Touch Pad (dated 1986; “still used in major swimming competitions”). ↩
Japan Swimming Federation, スポンサー (listing Seiko as 公式計時パートナー, official timekeeping partner). ↩
Swimming World, FINA Knocks USA As “Sore Losers”; Time Runs Out for Seiko (28 July 2001). ↩
Wikipedia, Swimming at the 2001 World Aquatics Championships. ↩
Swimming World, Swimming World Proposes Test of Seiko Touch Pads (30 July 2001). ↩

Last updated July 27, 2026.