砌墙砖收缩膨胀仪是测量长度变化的精密仪器，它适用于砌墙砖生产厂、科研单位、大专院校、建工部门等单位用来检测烧结普通砖、粉煤灰砖等砌墙砖的收缩及膨胀变形量。该产品是依据GB/T2542-2003《砌墙砖实验方法》标准制作的。
由：底座、试样架、测量表架、上测头、紧固螺钉、下测头、百分表、标准杆、试体固定螺钉、底座调整螺丝等组成。该产品是依据GB/T2542-2012《砌墙砖试验方法》标准设计制作，上下测头采用90°锥形凹座。具有使用方便、测量精度高、速度快、读数清楚等特点。
The wall brick shrinkage dilatometer is a precision instrument for measuring the change of length. It is suitable for wall brick manufacturers, scientific research units, universities, construction departments and other units to detect sintered ordinary bricks, fly ash bricks and other wall bricks The amount of contraction and expansion deformation. This product is made according to the standard of GB/T2542-2003 "Experimental Method of Wall Bricks".
Consists of: base, sample holder, measuring table holder, upper probe, fastening screw, lower probe, dial indicator, standard rod, specimen fixing screw, base adjustment screw, etc. This product is designed and manufactured in accordance with the standard of GB/T2542-2012 "Test Method for Wall Bricks", and the upper and lower probes use 90° conical recesses. It has the characteristics of easy use, high measurement accuracy, fast speed and clear readings.
砌墙砖收缩膨胀仪技术参数：
1、测量范围：251mm～261mm
2、标准杆长度：（256±0.02）mm；
标准杆测头球面半径：SR=2.25mm；
3、百分表量程：0-10mm
最小刻度值: 0.01mm；
4、外形尺寸（长×宽×高）：670×240×180mm
5、质量：≈10kg
Technical parameters of masonry brick shrinkage dilatometer:
1. Measuring range: 251mm～261mm
2. Standard rod length: (256±0.02) mm;
Standard rod probe spherical radius: SR=2.25mm;
3. Dial indicator range: 0-10mm
Minimum scale value: 0.01mm;
4. Dimensions (length×width×height): 670×240×180mm
5. Mass: ≈10kg
砌墙砖收缩膨胀仪注意事项：
1、使用时，忌用手直接与标准棒接触，应持外外套部分，以防止标准棒受人体手温的影响。
2、仪器用完毕后，应将测量框架的测量头和百分表探拭净，并涂以钟表油；测试过程中，应使百分表的测头缓慢而平稳地与试件接触，不允许冲击和碰撞，严禁将百分表测杆顶过量程范围，以免影响表的灵敏度和使用寿命。
砌墙砖收缩膨胀仪试验方法：
1、先将标准棒置于工作台上，拧动调整螺丝使之近似垂直。
2、将测量框架置于标准棒的顶头，调整螺杆和螺母，使百分表对准零位（或记下百分表之刻度）。
3、将制作养护好的试件两端擦拭净，然后放置在工作台上，然后把测量框架套在试件上，并左右移动表框，使试件与测量框架的测量头准确地接触，此时即可开始读数，并记录下表盘上的刻度值。
4、如果实验不是连续进行或实验历时较
Precautions for wall brick shrinkage dilatometer:
1. When in use, avoid direct contact with the standard rod with your hands, and hold the outer cover part to prevent the standard rod from being affected by the temperature of the human hand.
2. After the instrument is used, the measuring head of the measuring frame and the dial indicator should be probed and wiped clean and coated with watch oil; during the test, the probe of the dial indicator should be brought into contact with the test piece slowly and steadily. Shocks and collisions are allowed, and it is strictly forbidden to push the dial indicator rod beyond the maximum range, so as not to affect the sensitivity and service life of the meter.
Test method of wall brick shrinkage dilatometer:
1. Put the standard bar on the workbench first, and turn the adjusting screw to make it approximately vertical.
2. Place the measuring frame on the top of the standard rod, adjust the screw and nut to make the dial indicator align to the zero position (or record the scale of the dial indicator).
3. Wipe the two ends of the cured test piece clean, and then place it on the workbench, then put the measuring frame on the test piece, and move the table frame left and right to make the test piece accurately contact the measuring head of the measuring frame. Reading can be started at this time, and record the scale value on the dial.
4. If the experiment is not continuous or the experiment lasts longer
