Daiichi Keiki, Japan
Daiichi Keiki SC Series Contact Pressure Gauge
Manufacturer: Daiichi Keiki
Model: SC Series
Overview
The contact switch pressure gauge utilizes low-contact pressure switches. It is primarily used for alarms such as bells, buzzers, and flashing lamps. By operating the appropriate relay with this signal, its applications can be significantly expanded.
Features
This pressure gauge is ideal not only for alarms but also when on-site instructions are necessary. With just one pressure element, the pointer itself serves as the contact, making it relatively compact and lightweight.
Its scale for indication and setting are identical, simplifying the setup process. By moving the setting needle, you can set it as desired, and it’s easy to understand its operation at a glance.
The contact points utilize high-melting-point platinum. The case is available in both drip-proof and indoor specifications, catering to various environmental conditions.
Pressure gauge with contacts Case appearance
SCT-75 A
| SCT-75 B Type with rim for screw fixing  | CT-75 D
|
SCT-100 A
| SCT-100 B
| SCT-100 D
|
SCT-150 A
| SCT-150 B
| SCT-150 D
|
SCK-A/SCP-A
| SCK-B ・ SCP-B
| SCK-D
|
Due to improvements to this product, specifications may change without prior notice.
Notes
- To prevent chattering, even if installed in a location free of vibrations, the contact should always be OFF and turned ON only when an alarm occurs.
- Most failures in the ability to open and close contacts
are due to rough or welded contacts, or poor contact due to minute voltage and current, so please pay special attention to the following items. - Please install it in a place free from mechanical vibration.
- When using in equipment with pulsating pressure, take care to create a static pressure state using a dampener, etc.
- For inductive load switching circuits, install a surge suppressor circuit to prevent contact failure due to surge or inrush, if necessary.
- The rated capacity of the contact is expressed as the maximum value, so please be careful not to exceed it even momentarily, especially with the inrush of lamp loads, although it will differ depending on the usage conditions.
- Make sure that the power-on time is as short as possible.
- In sequence circuits using ICs, etc., the current is too low, resulting in poor contact. At least 20mA or more is required.
- If the movement of the pointer is extremely slow and incomplete contact is observed when turning the contacts ON and OFF, please use a delay relay as repeated use will significantly shorten the service life.
- Do not use this product in an atmosphere of flammable gas such as city gas, propane gas, or air mixed with organic solvents, as there is a risk of explosion.
- When the indicator needle contacts the contact needle and moves further, products with lower maximum pressure will cause errors in the reading. This is not a malfunction because even if the pointer tries to move, the balance spring’s restoring force works to push the pointer back.
Product name example
| SCT – 341B – 1MPa – H | |||
| (A) | (B) | (C) | (D) |
Product name (A)
| Model number | Purpose | case type | Case material | Electric wire outlet | Accuracy | Ambient temperature | |
| SCT *1 | indoor | General case | A type B type | Iron black (aluminum gold plating only for 150φ ) | Screw terminal extraction ( wire extraction for 75φ only ) | ±1.6%FS | -5～45℃ |
| DU type | SS Cr plated | ||||||
| SCP *2 | Outdoor | Plastic screw lid case | Plastic | Box connector | |||
| SCK | Outdoor | Metal screw lid case | Aluminum black | ||||
Product name (B)
| Size | Case appearance shape | Screw (general use) | Screws (corrosion resistant) | Wetted parts material | |||||||
| G3/8B | R3/8 | G1/2B | R1/2 | G3/8B | R3/8 | G1/2B | R1/2 | ||||
| 75 | AU | – | 331A | 831A | – | – | 336A | 836A | – | – | General purpose Stock C3604 Bourdon tube C2680TW SUS316 (over 10MPa) SCM435 (Model number SCT- excluding oil-free products over 10MPa)Corrosion-resistant use Stock SUS316 Bourdon tube SUS316 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| B.U. | Mounting holes | 331B | 831B | – | – | 336B | 836B | – | – | ||
| DU | Mounting holes | 331D | 831D | – | – | 336D | 836D | – | – | ||
| mounting bracket | 331DB | 831DB | – | – | 336DB | 836DB | – | – | |||
| 100 | AU | – | 341A | 841A | 441A *1 | 941A *1 | 346A | 846A | 446A | 946A | |
| B.U. | Mounting holes | 341B | 841B | 441B *1 | 941B *1 | 346B | 846B | 446B | 946B | ||
| DU | Mounting holes | 341D | 841D | 441D | 941D | 346D | 846D | 446D | 946D | ||
| mounting bracket | 341DB | 841DB | 441DB | 941DB | 346DB | 846DB | 446DB | 946DB | |||
| 150 | AU | – | 361A | 861A | 461A *1 | 961A *1 | 366A | 866A | 466A | 966A | |
| B.U. | Mounting holes | 361B | 861B | 461B *1 | 961B *1 | 366B | 866B | 466B | 966B | ||
| DU | Mounting holes | 361D | 861D | 461D | 961D | 366D | 866D | 466D | 966D | ||
| mounting bracket | 361DB | 861DB | 461DB | 961DB | 366DB | 866DB | 466DB | 966DB | |||
Note 2) For other special screws, please consult with us.
Product name (C) (D)
| Pressure span (MPA) | Contact type | ||
| Pressure | (0~0.1)~(0~100) | H | upper limit |
| Vacuum | -0.1～0 | L | lower limit |
| Coupled | (-0.1~0.1)~(-0.1~2.5) | H.L. | Upper and lower limit |
■ Electrical characteristics
| Rated voltage | Resistive load | Inductive load | Minimum load | Insulation resistance | Insulation withstand voltage |
| AC100V | 0.5A | 0.05A | DC5V 20mA | DC500V megger 100MΩ or more between each terminal case | AC1500V for 1 minute between terminals and case |
| AC200V | 0.2A | 0.025A | |||
| DC100V | 0.04A | – | |||
| DC30V | 0.2A | – | |||
| DC24V | 0.25A | – |
Due to improvements to this product, specifications may change without prior notice.
Dimensions
General case (SCT)
| Size | Case appearance | G3/8B | R3/8 | G1/2B | R1/2 | |
| 75 | A | – | SCT-75-A | – | – | |
|---|---|---|---|---|---|---|
| B | Mounting holes | SCT-75-B | – | – | ||
| D | Mounting holes | SCT-75-D | – | – | ||
| 100 | A | – | SCT-100-AU | SCT-100-AS | ||
| B | Mounting holes | SCT-100-BU | SCT-100-BS | |||
| D | Mounting holes | SCT-100-D | ||||
| 150 | A | – | SCT-150-AU | SCT-150-AS | ||
| B | Mounting holes | SCT-150-BU | SCT-150-BS | |||
| D | Mounting holes | SCT-150-D | ||||
| Size | Case appearance | G3/8B | R3/8 | G1/2B | R1/2 | |
| 75 | A | – | – | – | – | – |
|---|---|---|---|---|---|---|
| B | Mounting holes | – | – | – | – | |
| D | Mounting holes | SCT-75-D | – | – | ||
| 100 | A | – | – | – | – | – |
| B | Mounting holes | – | – | – | – | |
| D | Mounting holes | SCT-100-D | ||||
| 150 | A | – | – | – | – | – |
| B | Mounting holes | – | – | – | – | |
| D | Mounting holes | SCT-150-D | ||||
Plastic screw lid case (SCP)
| Size | Case appearance | G3/8B | R3/8 | G1/2B | R1/2 | |
| 75 | A | – | SCP-75-A | – | – | |
|---|---|---|---|---|---|---|
| B | Mounting holes | SCP-75-B | – | – | ||
| 100 | A | – | SCP-100-A | |||
| B | Mounting holes | SCP-100-B | ||||
| Size | Case appearance | G3/8B | R3/8 | G1/2B | R1/2 | |
| 75 | A | – | SCP-75-A | – | – | |
|---|---|---|---|---|---|---|
| B | Mounting holes | SCP-75-B | – | – | ||
| 100 | A | – | SCP-100-A | |||
| B | Mounting holes | SCP-100-B | ||||
Metal screw lid case (SCK)
| Size | Case appearance | G3/8B | R3/8 | G1/2B | R1/2 | |
| 75 | A | – | SCK-75-A | – | – | |
|---|---|---|---|---|---|---|
| B | Mounting holes | SCK-75-B | – | – | ||
| D | Mounting holes | SCK-75-D | – | – | ||
| 100 | A | – | SCK-100-A | |||
| B | Mounting holes | SCK-100-B | ||||
| D | Mounting holes | SCK-100-D | ||||
| 150 | A | – | SCK-150-A | |||
| B | Mounting holes | SCK-150-B | ||||
| D | Mounting holes | SCK-150-D | ||||
■ Corrosion-resistant applications
| Size | Case appearance | G3/8B | R3/8 | G1/2B | R1/2 | |
| 75 | A | – | SCK-75-A | – | – | |
|---|---|---|---|---|---|---|
| B | Mounting holes | SCK-75-B | – | – | ||
| D | Mounting holes | SCK-75-D | – | – | ||
| 100 | A | – | SCK-100-A | |||
| B | Mounting holes | SCK-100-B | ||||
| D | Mounting holes | SCK-100-D | ||||
| 150 | A | – | SCK-150-A | |||
| B | Mounting holes | SCK-150-B | ||||
| D | Mounting holes | SCK-150-D | ||||
Due to improvements to this product, specifications may change without prior notice.
